[TechAssist] Re: 70 volt line audio amp

Mark There is a good article on 70v speaker systems at
www.ticcorp.com/70v_guide.htm    Peter Kowalik  Keith's Stereo  Burl ON
pe.kow@xxxxxxxxxxxx

-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of markbrock
Sent: April 28, 2005 2:44 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: 70 volt line audio amp


brand new amp, works fine with one speaker and a mic, on the bench,  but
when attached to the phone system, has distortion,  I tried to blame it on
the phone co because if I disconnected them it worked ok with one speaker,
no there pointing back at me,  I need more ammo before I go further,  wish I
had a spare amp to try out.   old amp has blown output ic and one of the two
filters popped its lid,  I was just wondering if this  70 ohms of resistance
was going to be way off base ,  but apparently doesn't surprise anybody yet,
so I'll go a little farther.
Brock Electronics
R.R.4 box 237
5208  cr.3385
Independence Ks. 67301
620-331-0235
fax  331-7191

markbrock@xxxxxxxxxxxxx
Zenith*Philips*Peavey*Fender*Crate
we work on all brands,makes,models
of anything that plugs in the wall
----- Original Message -----
From: "becyn" <becyn@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, April 28, 2005 9:43 AM
Subject: [TechAssist] Re: 70 volt line audio amp


> Divide and conquer !
>
> Have you bench tested the amp with a 1Khz sine?
> It sounds more like the amp than the line.
> Many of those mutiple speaker setups have the taps set for a
> watt or less, so underpowering isn't an issue.
>
> Jim McVey
> McVey Alltronix
> 327 Broadway
> Newburgh N.Y. 12550
>
> "If it doesn't play...
> CALL MCVEY !!!!!!"
> Factory authorized
> service for over 20
> major brands.
> 845 561 8383
> (Last of the Mohegans)
>
>
>
>
> markbrock wrote:
>
> >ok,  whats the limit of resistance I can have at the amp using a 70 volt
> >line,  I have around 70 ohms, unit is very distorted,  40 watt system
about
> >15 speakers,  old unit burned up,  they bought a new one and its all
> >distorted,  then they called me,  I figured someone hung a regular
speaker
> >on the line but that would be closer to 16 or less ohms,   is 70 ok ?
they
> >may be under powered but it worked fine for 10 years previous.  thanks
> >brock
> >
> >Brock Electronics
> >R.R.4 box 237
> >5208  cr.3385
> >Independence Ks. 67301
> >620-331-0235
> >fax  331-7191
> >
> >markbrock@xxxxxxxxxxxxx
> >Zenith*Philips*Peavey*Fender*Crate
> >we work on all brands,makes,models
> >of anything that plugs in the wall
> >
>
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