One of my favorite methods of sound treatment is the products in the
link following: http://www.sonex-online.com/Pro%20Audio.htm
There are many other products, and many individuals use their own
creative means to be effective in sound absorption.
73
Bob, K4TAX
On 6/4/2018 1:00 PM, Jim Brown wrote:
On 6/4/2018 8:34 AM, Bob McGraw K4TAX wrote:
Room acoustics play a big part of the "how loud" factor. Absorptive
materials applied to the walls an ceiling of a room, specially small
rooms, do reduce the build up of sound / noise emitted from fans and
blowers.
YES! This is excellent advice. Indeed, the first place to put
absorptive material is on wall surfaces around the amp, treating other
wall surfaces can also help a lot. Hard surfaces contain the sound,
causing it to bounce around the room. Soft surfaces absorb the sound,
causing it to die out more quickly.
Mechanical coupling of vibration to the desk increases the audibility
of noise, so it can also help to isolate the amp from the shelf it is
sitting on.
Fan noise on the transmitted signal can be minimized in several ways,
all of which are pretty simple.
First, keep the mic close to your mouth -- sound falls off by 6dB per
doubling of distance. Boom mics, like the CM500, are great for this.
For best sound quality, I try to keep the mic an inch or two above and
to the side of my mouth. The principle is to maximize speech and
minimize noise -- a simple signal to noise problem.
Second, don't turn mic gain up higher than needed, and don't overdo
compression. This is the primary cause of excessive noise on
transmitted signals.
Third, set TXEQ to emphasize the speech range and de-emphasize other
sound. My guideline EQ settings do this -- max cut of the three lower
bands, 6 dB cut of the fourth band (400 Hz), and then get reports from
a careful listener.
73, Jim K9YC
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