[TechAssist] Re: 70 volt line audio amp
- From: becyn <becyn@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 28 Apr 2005 18:26:07 -0400
I'm going to ask a stupid question.
Does the "new amp" have a 70v port output?
If you are hooking up an 8 ohm system to the 70v ,
you will have a MAJOR impedance mismatch.
Essentially, the 70 v is the audio version of the power grid.
Step up the voltage( reduce current) to send long distances in order to
reduce
I^2 *R losses.
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)
J Silverman wrote:
>70 ohms of resistance sounds high. Amps work into impedance, which is a
>dynamic reflection of the load. DC ohms resistance should be much lower than
>the impedance number. Since that is a 70 volt line output, the DC load is
>just the resistance of the transformer windings.
>Jerry Silverman
>Greentron Inc
>4 Newland Ave
>Greenville SC 29609
>Fax/Phone 864 232 3889
>mail to: greentron@xxxxxxx
>----- Original Message -----
>From: "markbrock" <markbrock@xxxxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Thursday, April 28, 2005 2:43 PM
>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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