Re: [SlimDevices: Audiophiles] What's better?

2007-03-30 Thread P Floding

325xi;190301 Wrote: 
 It worth noticing that here lays the major difference between tcp/ip
 audio data transfer SB implements, and isochronous USB used by USB
 DACs. TCP/IP is asynchronous, so the very word jitter isn't applicable
 to a path between a computer and SB, appears only in between SB and
 SPDIF receiver, and after that. Isochronous USB act in a manner very
 similar to SPDIF, so you could have jitter started on one stage earlier
 - already between PC and the DAC.

Yes, altough USB CAN be properly used asyncronously, but almost never
is.. However, I did read about an interesting USB clock recovery chip
that brought down jitter to extremely low levels -better than existing
SPDIF receivers. Seems that the harder the problem the better the
solution. SPDIF looks simple, so hasn't been properly engineered (quick
lock-on being top priority, it seems).


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-30 Thread JohnSwenson

Since you guys brought it up, here is a little primer on USB audio. 

All modes in the official USB audio spec use isochronous transfer, this
means the host is sending out packets to match a particular transfer
rate (44.1 48 etc), this bandwidth is reserved on the bus. There is no
handshake per packet, the host keeps on shoving them out no matter
what. 

There are three audio modes: synchronous, adaptive and asynchronous.
(remember these are ALL isochronous, so you cannot say isochronous or
asynchronous, asynchronous IS isochronous!) 

Synchronous connects a PLL to the actual data stream on the USB bus.
This is the simplest connection but is VERY susceptible to jitter on
the bus since the PLL is directly tracking the bus. A number of cheap
early USB audio devices used this mode, but its pretty rare today.

Adaptive mode uses a frequency sysnthesizer of some sort to clock the
data out of the chip. The frequency is changed slowly based on how full
or empty the fifo is getting. The host is still in ultimate control, but
the output clock is not directly slaved to the bus, this can have much
lower jitter than synchronous mode. There are MANY different
implementations of this mode, some almost entirely analog and some
implemented in software on a processor. Some of these are actually
pretty darned good. Almost all implementations today use this mode.

Asynchronous mode, a completely separate clock is used to clock out the
data (you CAN use a super low jitter clock for this). A separate channel
is opened over the bus going from the receiver to the host which tells
the host to occasionally slightly speed up or slow down the
transmission. If the FIFO in the receiver is getting empty it tells the
host to speed up etc. 

Note the asynchronous mode is not really the same as TCP/IP, there is
no request or handshake per packet, there is NO error correction, if a
bad packet is found, tough. (error detection bits are sent, but the
only thing you can do with them is blink a front pannel light, there is
no retransmission capability)

The TI 1020 and 3200 are the only USB audio chips I'm aware of that
even have the capability of asynchronous mode, BUT you have to program
the chip to do this. This is not easy, I spent many months trying to do
this and finally gave up. I only know of one person that has
successfully implemented asynchronous mode on one of these chips. 

There HAVE been a couple of implementations using non-audio USB enabled
microprocessors, but again this takes custom firmware and drivers on the
computer. The companies that have done this are not high end companies
and have not taken advantage of the asynchronous mode to produce very
low jitter implementations. The high end companies can't afford the
manpower and time it takes to implement one of these, and the companies
that have implemented it are not sharing thier implementation with the
rest of the world. 

I hope that clears the air a little on this subject.

John S.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-29 Thread Artem85

FLAC for quality better
_
http://kudapoyti.com.ua


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-26 Thread 325xi

jhm731;189831 Wrote: 
 325xi-
 
 The Mac Mini isn't a laptop.
 
 I haven't seen any published jitter specs for any Mac products other
 Stereophile's test of the $129. Airport Express, which measured 258ps
 using a Musical Fidelity X-DACV3 DAC verses their 321ps measurement for
 the SB3. 
 
 I'll bet the digital outputs on the Mac Mini, Powerbook or iMac are as
 least as good as the AE.
 

It uses cramped laptop parts. As a free human being you can bet for
whatever you want, even that white is black - your right. Stereophile
jitter numbers, measured on analog outs don't mean much, and Dan Lavry
was among the first to state it.
What I say is that... I prefer to consider any mass market sound card,
including the one in your Mini, is bad, unless proven otherwise. Can
you prove?



P Floding;189936 Wrote: 
 Yet again a total and utter misunderstanding of how things actually
 work. Don't worry though, prominent hifi reviewers are often equally
 confused.
 
 The wired or wireless TCP/IP (network) connection is TOTALLY
 transparent to the SB3. The SB3 _asks_ for data and buffers lots of it
 and plays it back AT ITS OWN CLOCK'S SPEED.
 
 I believe it is exactly this lack of understanding of the massive
 benefits of _pulling_ the data from a TCP/IP network that keep making
 reviwers have silly preconceptions.

It worth noticing that here lays the major difference between tcp/ip
audio data transfer SB implements, and isochronous USB used by USB
DACs. TCP/IP is asynchronous, so the very word jitter isn't applicable
to a path between a computer and SB, appears only in between SB and
SPDIF receiver, and after that. Isochronous USB act in a manner very
similar to SPDIF, so you could have jitter started on one stage earlier
- already between PC and the DAC.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-26 Thread cliveb

325xi;190301 Wrote: 
 Isochronous USB act in a manner very similar to SPDIF, so you could have
 jitter started on one stage earlier - already between PC and the DAC.
Hang on a minute USB also has an asynchronous mode, where the
receiver pulls the data from the sender. I had always assumed that USB
DACs would use asynchronous mode, because it's the mode that makes
sense. You seem to be suggesting that they don't - can you confirm this
for sure?


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-26 Thread 325xi

cliveb;190304 Wrote: 
 Hang on a minute USB also has an asynchronous mode, where the
 receiver pulls the data from the sender. I had always assumed that USB
 DACs would use asynchronous mode, because it's the mode that makes
 sense. You seem to be suggesting that they don't - can you confirm this
 for sure?

Yes, I can, but I'd suggest you to look even in this very forum to
confirm that. There's no audio chipset supporing asynchronous USB.
There are few custom solutions, such as Empirical Audio, but all the
USB DACs use what they have off the shelf - isochronous USB.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-26 Thread cliveb

325xi;190307 Wrote: 
 Yes, I can, but I'd suggest you to look even in this very forum to
 confirm that. There's no audio chipset supporing asynchronous USB.
 There are few custom solutions, such as Empirical Audio, but all the
 USB DACs use what they have off the shelf - isochronous USB.
If the right parts aren't available to build a device properly, then
why build it at all? (OK, I realise that if you can sell the damn
things, then that's a reason to make them, but from an engineering
perspective it's crazy). What am I missing here?


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-26 Thread 325xi

cliveb;190323 Wrote: 
 If the right parts aren't available to build a device properly, then why
 build it at all? (OK, I realise that if you can sell the damn things,
 then that's a reason to make them, but from an engineering perspective
 it's crazy). What am I missing here?

Exactly...


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-26 Thread creativepart

Thanks all. I just ordered my Squeezebox and I'll be starting this
adventure later this week. I realize that while I'm late to this party
it still isn't mainstream just yet.

The number of choices and options is tough to sort through. So I think
it's just best to start spending money and give things a go.

I appreciate your help.

Oh, in the end, I choose the Squeezebox for three reasons:
1. It is a good starting place -- a self-contained solution
2. It seems to be well supported and generally capable
3. This forum community seems dedicated to improvements

Thanks


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-25 Thread Robin Bowes
jhm731 wrote:
 Robin Bowes;189863 Wrote:
 My expectations are that you cannot say that one digital source 
 should be as good as another. I'm not in a position to say 
 whether one is better than the other or vice versa, but I certainly
  wouldn't expect them to be the same. I believe that is a more
 valid expectation than yours.
 
 R.
 
 You're right, I shouldn't expect the Mac Mini's and SB3's digital 
 outputs to sound exactly the same, so I'd like to revise the 
 expectation of my original suggestion to creativepart
 
 Option one: Mac Mini's built in optical digital output to an external
  DAC
 Option two: a Mac Mini wirelessly connected to a SB3, and then 
 digital out to the same external DAC.
 
 Revised expectation: Option one should sound better.

Why?

R.

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Re: [SlimDevices: Audiophiles] What's better?

2007-03-24 Thread Robin Bowes
jhm731 wrote:

 I've never said all digital sources are the same, and they all work
 just the same with all external dacs and every possible cable, both
 coax and optical.
 
 I said the Mac Mini's digital output should be atleast as good as the
 SB3's digital out using a DAC like the Lavry, which
 others on this forum have reported works well with a SB3.  

Why should it?

 Until you perform a Mac Mini/SB3 comparison/measurements,your
 expectations are no more valid than mine.

My expectations are that you cannot say that one digital source should
be as good as another. I'm not in a position to say whether one is
better than the other or vice versa, but I certainly wouldn't expect
them to be the same. I believe that is a more valid expectation than yours.

R.

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Re: [SlimDevices: Audiophiles] What's better?

2007-03-24 Thread jhm731

Robin Bowes;189863 Wrote: 
  My expectations are that you cannot say that one digital source
 should
 be as good as another. I'm not in a position to say whether one is
 better than the other or vice versa, but I certainly wouldn't expect
 them to be the same. I believe that is a more valid expectation than
 yours.
 
 R.

You're right, I shouldn't expect the Mac Mini's and SB3's digital
outputs to sound exactly the same, so I'd like to revise the
expectation of my original suggestion to creativepart

Option one: Mac Mini's built in optical digital output to an external
DAC. Option two: a Mac Mini wirelessly connected to a SB3, and then
digital out to the same external DAC. 

Revised expectation: Option one should sound better.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-24 Thread P Floding

jhm731;189931 Wrote: 
 You're right, I shouldn't expect the Mac Mini's and SB3's digital
 outputs to sound exactly the same, so I'd like to revise the
 expectation of my original suggestion to creativepart
 
 Option one: Mac Mini's built in optical digital output to an external
 DAC. Option two: a Mac Mini wirelessly connected to a SB3, and then
 digital out to the same external DAC. 
 
 Revised expectation: Option one should sound better.

Yet again a total and utter misunderstanding of how things actually
work. Don't worry though, prominent hifi reviewers are often equally
confused.

The wired or wireless TCPIP (network) connection is TOTALLY transparent
to the SB3. The SB3 _asks_ for data and buffers lots of it and plays it
back AT ITS OWN CLOCK'S SPEED.

I believe it is exactly this lack of understanding of the massive
benefits of _pulling_ the data from a TCPIP network that keep making
reviwers have silly preconceptions.


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No, I didn't ABX it. And I won't even if you ask me. (Especially not if
you ask me.)

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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread bernt

FLAC for quality, tagging and trouble-free streaming. Best thing since
sliced bread.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread The Smokester

I would say given the level of your system you should be considering a
Transporter or SB/External DAC equivalent.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread creativepart

Thank you for your detailed help. I had not really considered all that a
Squeezebox could do. However, the only things that are important to me
at this time -- however that may change -- is the ability to use the
files on my Mac Mini with my stereo system AND to be able to access my
playlists, etc.

Also, of course, it is manditory to be able to quickly and easily grow
into a better stand alone DAC system. Both of my mentioned options do
both of these things.

There is one plus for the SQ and one negative for the SQ as well. The
plus is seeing the song display. I think that's pretty big. The
negative is not being able to play iTunes purchased music. Now, I've
never purchased anything on iTunes because I don't like 128K MP3 files.
But someday that could change and iTunes will offer Lossless files.
Then, maybe I would purchase some music from iTunes.

I'm leeeaning toward the Squeezebox as my starting point.

Thanks again for all the help. I really appreciate it.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread ErikM

The other player to consider is the Sonos system.. it does somethings
better than SB somethings not as well.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread tomjtx

Apple DRM can be circumvented by burnig a CD and reimporting to Itunes.
If Itunes offers lossless in the future there would be no degradation
in SQ.
There are some software programs that will do this automatically.

You might want to listen to a Transporter before going with the SB, it
is one of the best DACs out there, IMO.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread smarjan

azinck3;189647 Wrote: 
 6.  Do you care about anytime access to a central database of music that
 you can access over the internet via slimserver?
 

Azinck3, could you please expand that line a bit more? I am still
exploring SB...


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread azinck3

smarjan;189754 Wrote: 
 Azinck3, could you please expand that line a bit more? I am still
 exploring SB...

Slimserver is a server application that runs on your computer and does
2 things, primarily:

1) serve music/data to hardware players like the SB or transporter and
software players like softsqueeze or media player (via mp3 stream)

2) Gives you centralized control/browsing/search for all your music and
all your players via a web interface.

While slimserver has many other capabilities, those are the two things
its primarily designed to accomplish.  This is nice because all of your
music is in one place, in one database, and control of all playback
devices is unified.  From any computer in the world with a web browser
and internet connectivity I can browse and listen to all of my music
and control any of my squeezeboxes (I have 4).   Another cool thing:  I
have a couple of friends with squeezeboxes and when I'm at their houses
sometimes we want to listen to my collection and all it takes is
pointing their SB's at my server.

Slimserver and softsqueeze are a free download--I'd recommend you give
them a try to get familiar with the paradigm.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread Phil Leigh

The thing I don't get is why anyone would want to buy DRM files
(lossless or not) from anywhere...It's certainly not something I will
ever do. I don't want music to be licensed to me - I want to own
it...and do anything with it that is legal / fair use.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread jhm731

creativepart;189638 Wrote: 
 
 I like the SQ concept, but with the Mac Mini I get a remote control and
 iTunes and built in WiFi so I'm pretty set. With the AEX I could be up
 and running off of iTunes in an hour or less using the AEX's internal
 DAC.

With the Mac Mini you also get an optical digital output which you
can plug directly into a external DAC. Buy a DAC, optical cable and a
small display for your Mac Mini and you're done.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread 325xi

jhm731;189768 Wrote: 
 With the Mac Mini you also get an optical digital output which you can
 plug directly into a external DAC. Buy a DAC, optical cable and a small
 display for your Mac Mini and you're done.

Why do you think mere having optical out guarantees quality of that
mini sound card feeding that out?


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread yooper

When you get your Mac Mini, be sure to disable (under pref. in iTunes)
the sound candy such as eq, soundcheck and enhancer.  

Under applications-utilities-find midi and see that 44.1kHz is
checked.  Also, be sure that iTunes and the main Mini volume are set at
max, and use you pre-amp/receiver to adjust volume.

I have a Mini in my listening room and used iTunes/ALAC for all two
channel listening.  The mini was connected via a glass toslink to my
pre-amp.  It sounds very good.

After a year or so, I decided I wanted an external DAC, researched a
lot, but decided on a Transporter because of the positive feedback
concerning its DAC.

I have converted all my ALAC files to FLAC, and only use Slimserver. 
The one feature I really miss from iTunes is the ease of navagating
through the georgeos Album art view.  With the recent iTunes update, it
is now full screen.

That said, overall, I prefer Slimserver to iTunes.

As another poster mentioned, burn DRM files to a cd, then importing the
files will solve your concern.

Mark


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread Deaf Cat

A mate bought an airport express, only had it working for 1/2 hour or
so, and then put it back in the box.  Apparently he could not live with
the sound it was producing.  I did not listen and don't know exactly how
he set it up, so I'm afraid I can't comment on set up etc.  After
further research he has decided to go for a SB once he has more
cash.

So it may be an idea to get a listen to all in the equation, if at all
possible.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread Robin Bowes
jhm731 wrote:
 325xi;189770 Wrote: 
 Why do you think merely having optical out guarantees quality of that
 mini sound card feeding that out?
 
 Why do you think the SB's digital output would sound any better 
 than the Mac Mini's digital output? Have you compared them?

There are several reasons why I would expect the SB's digital output to
be better than a Mac Mini digital out. I've not done a comparison as I
don't have a Mac Mini.

 If you use an external DAC like the Lavry, the Mac Mini's digital
 output should perform just as well as the SB's digital ouput.

Sure, because all digital sources are the same, and they all work just
the same with all external dacs and every possible cable, both coax and
optical.

Yeah, right.

R.

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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread 325xi

jhm731;189791 Wrote: 
 Why do you think the SB's digital output would sound any better than the
 Mac Mini's digital output? Have you compared them?

I don't state one is better then the other, but when someone tells me
he's going to use generic laptop soundcard I would be concerned, unless
I know that that particular generic laptop soundcard is very good. 


jhm731;189791 Wrote: 
 If you use an external DAC like the Lavry, the Mac Mini's digital output
 should perform just as well as the SB's digital ouput.

Visit Lavry's own forums, you'll find many interesting things to
consider. For example that even Lavry, while being among the best in
handling jitter, doesn't get any close to filtering out all of it. And
tiny card jammed in tiny case - you'll never know what's going on with
EMI/RF over there...


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread jhm731

325xi-

The Mac Mini isn't a laptop.

I haven't seen any published jitter specs for any Mac products other
Stereophile's test of the $129. Airport Express, which measured 258ps
using a Musical Fidelity X-DACV3 DAC verses their 321ps measurement for
the SB3. 

I'll bet the digital outputs on the Mac Mini, Powerbook or iMac are as
least as good as the AE.

Mr.Bowes- 

I've never said all digital sources are the same, and they all work
just the same with all external dacs and every possible cable, both
coax and optical.

I said the Mac Mini's digital output should be atleast as good as the
SB3's digital out using a DAC like the Lavry, which
others on this forum have reported works well with a SB3.  

Until you perform a Mac Mini/SB3 comparison/measurements,your
expectations are no more valid than mine.


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-23 Thread peterw

325xi;189770 Wrote: 
 Why do you think merely having optical out guarantees quality of that
 mini sound card feeding that out?

Or the Airport Express, for that matter. This serious review of the
AEX digital out --
http://www.stereophile.com/budgetcomponents/505apple/ -- sounds upbeat,
but sections like the following seem a little disconcerting:

One operational glitch that didn't affect my system to any significant
extent but did do so for some readers was the fact that, as the AE
doesn't have a local clock circuit, when the incoming data is
interrupted, as it is when you change songs in iTunes, there is no
longer a digital output to feed the DAC, which loses lock as a result.
Both the Levinson and the Benchmark DACs that I use deal gracefully
with the lost lock ... I therefore missed the fact that with some other
DACs, the first seconds of a song might be cut off.

AE ... is limited to ... 16-bit data only. ... It is also important to
note that the AE functions only at a 44.1kHz sample rate. When you play
32kHz or 48kHz data, iTunes sample-rate-converts the data in real time
before sending it to the AE. (The SB handles 44.1 and 48; the
Transporter can also handle 96k. Both can handle 24-bit recordings,
according to http://forums.slimdevices.com/showthread.php?t=32951)

Since Apple doesn't prominently post the sort of technical detail that
you can get on Slim's hardware
(http://wiki.slimdevices.com/index.cgi?HardwareComparison), I think you
should seek out such reviews. I get the feeling that Apple included the
digital output because of the prevalence of digital inputs in mid-fi AV
receivers -- not for high-end gear. Certainly Apple's marketing this as
hi-fi doesn't help their hi-fi credibility:
http://www.apple.com/ipodhifi/

...but the widespread praise of the cheap T-amps makes it clear that
you shouldn't rule Apple's hardware out just because their gear is not
expensive enough!

Sonos: a quick search in these forums will turn up hours' worth of
reading. Here's one place you might start:
http://forums.slimdevices.com/showthread.php?t=23490

-Peter


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Re: [SlimDevices: Audiophiles] What's better?

2007-03-22 Thread azinck3

creativepart;189638 Wrote: 
 So, with all the knowledge that you guys have about these choices, which
 way would you go? Would you say the SQ is really a good way to go at
 this time -- or is it more of an even draw with the AEX knowing that
 I'm using a Mac Mini
 
 I appreciate your responses and will carfully consider all advice 
 given.
 Thanks

Some of the big questions to answer (not being super-familiar with
apple products these questions are more squeezebox-biased):

1. How much do you care about the Squeezebox's display?  For me, having
to turn on a tv or a sit at a computer to control my audio is a
deal-breaker.

2.  Do you want to easily expand the system and add units for
multi-room audio?  the SB excels at this, allowing centralized control
of all audio, synchronization, and great overall flexibility.

3.  Do you need to be able to play Itunes protected content?  Only
apple products can do that.

4.  Do you care about always-on access to pandora and rhapsody via
squeezenetwork?

5.  The SB and slimserver are amazingly customizable with community
plugins available to do virtually anything you can imagine, from
checking voicemail, weather, sports, integration into home-control
systems like xpl and others, and so much more.  Are these things that
matter to you?

6.  Do you care about anytime access to a central database of music
that you can access over the internet via slimserver?

7.  Do you want to be able to use unique control devices like a pda,
nokia770, any computer, an IR remote, crestron system, or any of the
other myriad devices that can interface to control a SS/SB system?

All of this hits on one major thing:  A big selling point of the
squeezebox is the overall architecture.  It's not simply about how good
it sounds or how pretty the web interface is.  It's a unique
architecture, providing a centralized repository for music that can be
flexibly streamed to different playback devices and simultaneously
controlled by different control devices.  It's very open, very
extensible.  This is quite different from the Apple model and I think
having a good understanding of this difference will ultimately inform
your decision.


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