These Line 6 units are well respected in the electric bass world, especially considering their moderate price. I think bass players appreciate tight timing, and the low lag may be one reason these units are popular. Also, they have proven to be rugged enough to be "road-worthy". They can also model the hi-frequency lossiness of cords, though that seems of dubious value in your case.

Phil


On 3/1/13 12:24 PM, katja wrote:
Apparently, Line 6 managed to build a digital 2.4 GHz wireless with <4 ms latency, the Relay G30, G50 etc . They do not write it in the specs, but most users don't notice latency and when they do, their support is speaking of latency as low as that:

http://line6.com/support/thread/33898

This weekend I will do some WiFi experiments and see how fast it can go locally, using mrpeach udp and tcp classes. If it works, one could use a wireless router which has no other task than routing Pd audio, and the computer at the receiving end could be a cheap headless board with no other task than receiving Pd audio and converting it to analog. Together the receiving device could be the size of a weight-watcher's lunch box, while at the transmitter side the computer's built-in stuff is used. Maybe I'm a bit naive here, anyway I'll report results from experiments.

Katja


On Fri, Mar 1, 2013 at 2:14 PM, richard duckworth <richduckwo...@yahoo.com <mailto:richduckwo...@yahoo.com>> wrote:

    OMG - that's really high! Maybe Tranz have a belt holder solution
    - they do look kind of bulky though! Maybe worth dropping them a
    line, see if they'll help the Pd community

    Rich Duckworth
    Lecturer in Music Technology
    Department of Music
    House 5
    Trinity College
    Dublin 2
    Ireland
    Tel 353 1 896 1500

    "Digital?
    Is that the thing where they take a good old sine wave and they
    chop it up into little bits?" --- Rupert Neve
    ------------------------------------------------------------------------
    *From:* katja <katjavet...@gmail.com <mailto:katjavet...@gmail.com>>
    *To:* Antoine Villeret <antoine.ville...@gmail.com
    <mailto:antoine.ville...@gmail.com>>
    *Cc:* richard duckworth <richduckwo...@yahoo.com
    <mailto:richduckwo...@yahoo.com>>; "pd-list@iem.at
    <mailto:pd-list@iem.at>" <pd-list@iem.at <mailto:pd-list@iem.at>>
    *Sent:* Friday, 1 March 2013, 13:12
    *Subject:* Re: [PD] wireless audio from Pd to PA system (katja)

    Found more info about TI's PurePath wireless. Latency of wireless
    transmission is 768 samples minimum. Added to this must be the
    latencies of ad/da conversion.

    http://e2e.ti.com/support/low_power_rf/f/382/t/110331.aspx

    Forget about it, this concept is only useful for home entertainment.

    Katja


    On Fri, Mar 1, 2013 at 1:19 PM, katja <katjavet...@gmail.com
    <mailto:katjavet...@gmail.com>> wrote:

        Thanks everyone for your answers.

        The case is unconventional because a stereo line signal must
        be sent from the computer. Professional wireless systems
        assume mic or instrument. Consumer systems do transmit stereo
        signal, but without bothering too much about latency.

        Frankly, I did not expect the difficulty to find a good
        solution. Initially I wanted the wearable computer for a music
        video which is to be recorded live with sounds from natural
        objects. I bought the FM transmitter so my cameraman will be
        able to hear the music while he's filming. For this purpose it
        is ideal. Then I thought it would be good to use the computer
        in it's wearable mode for public performance. I figured that
        one of the many wireless solutions would suit the purpose, but
        didn't reckon with the unusual requirements.

        Further searching brought me to a new technology 'PurePath'
        from Texas Instruments. It has a range comparable with WiFi
        (30m), while it seems to work with paired devices as in
        Bluetooth. I haven't seen consumer products with this
        technology, but development kits are available. A rather
        convincing demo is here:

        http://www.youtube.com/watch?v=0YsnZQUfVGs

        If this system can work with low latency it could be perfect
        for wireless Pd.

        Katja




        On Fri, Mar 1, 2013 at 11:41 AM, Antoine Villeret
        <antoine.ville...@gmail.com
        <mailto:antoine.ville...@gmail.com>> wrote:

            hello,

            those are good for what they have been designed for and it
            depends on what you mean by "exellent sound quality"

            I've made few tests on those few years ago and the
            bandwidth could be good enough to transmit guitar/bass
            signal but nothing else for me

            +
            a


            --
            do it yourself
            http://antoine.villeret.free.fr
            <http://antoine.villeret.free.fr/>


            2013/2/28 richard duckworth <richduckwo...@yahoo.com
            <mailto:richduckwo...@yahoo.com>>

                Hi Katja
                one of these would do it - check with Thomann tech
                support for gain issues (these are Instrument Level
                input) They should be fine however as active guitar
                pickups (like heavy style EMG pickups) output quite
                high levels. These type of wireless systems tend to be
                very rugged, have excellent sound quality and long
                battery life - and you'll want these things.

                
http://www.thomann.de/ie/cat.html?gf=wireless_for_guitar_bass&oa=pra


                Rich Duckworth
                Lecturer in Music Technology
                Department of Music
                House 5
                Trinity College
                Dublin 2
                Ireland
                Tel 353 1 896 1500

                "Digital?
                Is that the thing where they take a good old sine wave
                and they chop it up into little bits?" --- Rupert Neve
                
------------------------------------------------------------------------



                Message: 3
                Date: Thu, 28 Feb 2013 11:53:43 +0100
                From: katja <katjavet...@gmail.com
                <mailto:katjavet...@gmail.com>>
                Subject: [PD] wireless audio from Pd to PA system
                To: pd-list <pd-list@iem.at <mailto:pd-list@iem.at>>
                Message-ID:
                
<cafy0eappskfw+gvaxutr7exhqlig+ptdu8rk6sntraliys2...@mail.gmail.com
                <mailto:ptdu8rk6sntraliys2...@mail.gmail.com>>
                Content-Type: text/plain; charset=ISO-8859-1

                For a wearable live performance computer, I am looking
                into the
                options of sending wireless audio from Pd to a PA
                sound system and
                other listeners.

                In a first experiment I've tried a Linex FM
                transmitter. Audio quality
                is good enough, and FM transmitters do not introduce
                latency. This
                option is cheap and flexible, as the signal can be
                received by simple
                radio's, which are even built into cell phones and
                media players. I
                would need to boost the transmission a bit to make it
                more reliable.
                This will of course make the equipment illegal. Even
                then, the risk
                that someone else is transmitting a stronger signal on
                the channel can
                not be excluded.

                Another option could be to send audio over Wifi. This
                would require
                WLAN to be available, and one extra computer (with
                audio interface) as
                a receiver. To avoid extra latency the audio should be
                sent
                uncompressed, like [udpsend~] / [udpreceive~] can do
                it. This has the
                risk of packet loss and serious dropouts.

                I've been searching for 2.4 GHz wireless music
                receivers and found
                things like this:
                http://www.sitecom.com/en/wireless-music-streamer/wl-061/p/203.
                They
                seem to act like external soundcards for your
                computer. In Linux
                though I've never managed to properly connect multiple
                soundcards with
                Pd (in OSX it's easy using the Aggregate Device Editor
                from Audio MIDI
                Setup). Also I guess these devices introduce huge
                latency. With audio
                over bluetooth headsets I've experienced latencies up
                to a second.

                Does anyone use a satisfactory method in practice, to
                send audio from
                Pd without wires?

                Thanks,
                Katja



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