car amp bridging

[clunky]

I have an older power amp for my subwoofer that I'm about to wire up.
Unfortunately I lost the owners manual. I know it can be bridged but my
dilemma is how to bridge it. My understanding is that bridging means running
off the positive output of one side and the negative of the other. Yet on
the amp itself it says "MONO - " pointing to the right positive ( red )
connection and "MONO +" pointing to the left positive ( red ) connection. It
seems that to bridge it you have to wire up to the positive of each channel.
I thought it was the positive of one channel and the negative of the other
channel. The amp is an old Sherwood SCA-2100.

Any ideas would be greatly appreciated. Thanks!

[flak_monkey]

No. You bridge how the amp says. And generally, bridging -is -the
positive and negative of a channel. I've never even heard of an amp
that used both positives. That wouldn't make any sense. Positive to
positive, negative to negative.


--
flak_monkey

[clunky]

That's what I thought. I used to bridge pro gear for live sound systems but
the markings on the car amp didn't make sense.

Thanks!


"flak_monkey" <flak_monkey.2r875z@no-mx.forum.carstereos.org> wrote in
message news:flak_monkey.2r875z@no-mx.forum.carstereos.org...
>
> No. You bridge how the amp says. And generally, bridging -is -the
> positive and negative of a channel. I've never even heard of an amp
> that used both positives. That wouldn't make any sense. Positive to
> positive, negative to negative.
>
>
> --
> flak_monkey

[John Durbin]

That means the amp bridges symmetrically & does not have an inverted
channel in the front end as most car amps do. You can confirm this by
checking continuity between the amp output negatives; they should be
common with each other.

The positives are the hot rails of a symmetrical amp design. In order to
bridge, you'll have to provide a mono input signal to whichever of the
two RCA inputs is used for bridged operation. This type of amp should
also have a switch on it labeled bridge or mono/stereo that inverts the
mono signal provided to the non-inverted channel & routes it to the
other channel of the amp.

This architecture is more common on older car amps and is the norm in
home audio; Rockford's mixed mono bridging design unfortunately came to
dominate the industry leading to the +/- connection you are familiar with.

You can always pick up a manual if you need to:

http://www.manuals-in-pdf.com/advanced_search_result.php?keywords=sherwood+sca21 00&osCsid=7c935073bcf32dfa89f57e02f2c92b74&x=19&y=6

JD

clunky wrote:
> I have an older power amp for my subwoofer that I'm about to wire up.
> Unfortunately I lost the owners manual. I know it can be bridged but my
> dilemma is how to bridge it. My understanding is that bridging means running
> off the positive output of one side and the negative of the other. Yet on
> the amp itself it says "MONO - " pointing to the right positive ( red )
> connection and "MONO +" pointing to the left positive ( red ) connection. It
> seems that to bridge it you have to wire up to the positive of each channel.
> I thought it was the positive of one channel and the negative of the other
> channel. The amp is an old Sherwood SCA-2100.
>
> Any ideas would be greatly appreciated. Thanks!
>
>