[Jukebox-list] Audio question

[Wesley Dean]

    JC, good consumer type solid state amplifiers have direct coupled 
outputs and are capable of passing sub-bass that is of no practical value to 
the average listener and is the area most prone to objectionable low 
frequency feedback. This rarely occurs in jukes because they are designed 
around the problem. Wes
----- Original Message ----- 
From: <Jjmscf at aol.com>
To: <jukebox-list at lists.netlojix.com>
Cc: <Jjmscf at aol.com>
Sent: Tuesday, July 24, 2007 9:19 PM
Subject: Re: [Jukebox-list] Audio question


>
> They're useful for that on home equalizers too.In my case I like lots of 
> bass
> but I'm limited on how far I can put my  speakers from the tuntable on my
> home system due to lack of space. The right speaker is not a problem where 
> I
> placed it.( I think because it's far away from any corners.I could stop 
> the
> feedback by moving the balance to the right.) but only the equalizer can 
> stop the
> acoustical feedback at very low frequncy that no amount of isolation could 
> from
> the left plus moving the speaker away from the corner could.I put a 
> jukebox in
> the corner instead.The speaker kinda looks funny between a chair and the
> jukebox  while the other sits flat agains the wall on the right side of 
> the tv but
> that's where the feed back was much lower.It was terrible when it was in 
> the
> corner.I couldn't even get past 3 and 1/2 out of 10 on the volume before 
> it
> started rumbling.If turned higher it would break into low frequency 
> oscillation
> that threatened to shatter the windows in the room.It was still there 
> slightly
> when the volume was cranked even holding the turntable in the air so the
> feedback to the cartridge was through the air. But turning the bottom most 
> control
> on the left channel on my 9 band per channel equalizer down and  I can 
> crank
> it to ear splitting levels with all the bass I want and no feedback.
> Jukeboxes must roll off the low end  at a certain frequency to prevent 
> this
> but most have no shortage of bass. I had to struggle to eliminate it in a 
> home
> stereo and everything is right there in the same cabinet on a jukebox and 
> they
> don't feedback unless you have bad isolation parts such as motor grommets 
> in
> a Rockola,AMI or Wurlitzer and motor coupler and turntable grommets in a
> Seeburg.I do have on the home stereo those big 15" woofer speakers from 
> the
> 80s.I've tried over the years different turntables,different 
> cartridges,room
> placement,hanging the turntable from the ceiling, you name it.Until I 
> finally lucked
> on the right speaker placement and that little Kenwood equalizer turntable
> feedback was the bane of my existence.Or maybe my  light tracking high 
> compliance
> cartridge just doesn't like those foam surround bass reflex woofers.The
> cartridge does claim to go down to 15 hz. Maybe that's where the feedback 
> was being
> picked up?
>
> J.C.
>
>
> In a message dated 7/24/2007 5:22:45 PM Eastern Daylight Time,
> wesleydean at cox.net writes:
>
>>One useful purpose of EQ's is the use of 'T' notch filters to eliminate
>>acoustical feedback in auditoriums. They are also good in tailoring sound
>>for defective ears on a personal level. I once had a friend that had to 
>>roll
>>off the low end at 500 hz. Wes
>
>
>
>
>
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