Hi,

I wish to connect two power amps together. Do I use parallel on both amps
and control volume on the bottom amp?

Thanks.

rothman wrote:

I wish to connect two power amps together. Do I use parallel on both amps
and control volume on the bottom amp?

In general, paralleling modern transistor amps is a good way to start a fire.

You can bridge some amplifiers, but not all. Bridging gives you twice the
voltage output, but no more current, so if your goal is to drive lower Z
loads, it won't help. But if you need to sink more power into an eight-ohm
load with amps that can drive four ohms, bridging is the way to go.

What are you trying to do?
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4 Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our noise.

So use parallel?

Doug



"Scott Dorsey" wrote in message
...
rothman wrote:

I wish to connect two power amps together. Do I use parallel on both amps
and control volume on the bottom amp?

In general, paralleling modern transistor amps is a good way to start a
fire.

You can bridge some amplifiers, but not all. Bridging gives you twice the
voltage output, but no more current, so if your goal is to drive lower Z
loads, it won't help. But if you need to sink more power into an
eight-ohm
load with amps that can drive four ohms, bridging is the way to go.

What are you trying to do?
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

rothman wrote:
Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4 Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our noise.

So use parallel?

No, you cannot parallel modern amps, as I said.

You can bridge them, if the amplifiers are capable of bridging. That gives
you considerably more power.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Scott Dorsey wrote:
rothman wrote:
Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4 Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our noise.

So use parallel?

No, you cannot parallel modern amps, as I said.

You can bridge them, if the amplifiers are capable of bridging. That gives
you considerably more power.

To the original poster: I think what Scott is suggesting is that you can
take your 2 amps, which are probably stereo, run each one in bridged mode,
each one driving a single speaker. But only if the amps are capable of
being bridged.

Bridging a stereo amp renders it as a mono amp but driving about twice
as much power. But in can only be done on certain amps. Some amps
provide a bridge switch on them, and then you use the two red outputs
to drive one speaker.

Rob R.

Thank You, Thank You......Rob, that was very helpful information. So..Switch
to bridged mono on each amp....feed each amp a different signal....and
connect a single speaker to each amp using both positive terminals on each
amp. Is this my understanding?

Then how do they connect all those multiple amps on say a stadium tour?

just curious.


Doug







"Rob Reedijk" wrote in message
...
Scott Dorsey wrote:
rothman wrote:
Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps
put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4
Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our
noise.

So use parallel?

No, you cannot parallel modern amps, as I said.

You can bridge them, if the amplifiers are capable of bridging. That
gives
you considerably more power.

To the original poster: I think what Scott is suggesting is that you can
take your 2 amps, which are probably stereo, run each one in bridged mode,
each one driving a single speaker. But only if the amps are capable of
being bridged.

Bridging a stereo amp renders it as a mono amp but driving about twice
as much power. But in can only be done on certain amps. Some amps
provide a bridge switch on them, and then you use the two red outputs
to drive one speaker.

Rob R.

Thank You, Thank You......Rob, that was very helpful information. So..Switch
to bridged mono on each amp....feed each amp a different signal....and
connect a single speaker to each amp using both positive terminals on each
amp. Is this my understanding?

Then how do they connect all those multiple amps on say a stadium tour?

just curious.


Doug







"Rob Reedijk" wrote in message
...
Scott Dorsey wrote:
rothman wrote:
Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps
put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4
Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our
noise.

So use parallel?

No, you cannot parallel modern amps, as I said.

You can bridge them, if the amplifiers are capable of bridging. That
gives
you considerably more power.

To the original poster: I think what Scott is suggesting is that you can
take your 2 amps, which are probably stereo, run each one in bridged mode,
each one driving a single speaker. But only if the amps are capable of
being bridged.

Bridging a stereo amp renders it as a mono amp but driving about twice
as much power. But in can only be done on certain amps. Some amps
provide a bridge switch on them, and then you use the two red outputs
to drive one speaker.

Rob R.

Scott Dorsey wrote:
rothman wrote:
Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4 Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our noise.

So use parallel?

No, you cannot parallel modern amps, as I said.

You can bridge them, if the amplifiers are capable of bridging. That gives
you considerably more power.

To the original poster: I think what Scott is suggesting is that you can
take your 2 amps, which are probably stereo, run each one in bridged mode,
each one driving a single speaker. But only if the amps are capable of
being bridged.

Bridging a stereo amp renders it as a mono amp but driving about twice
as much power. But in can only be done on certain amps. Some amps
provide a bridge switch on them, and then you use the two red outputs
to drive one speaker.

Rob R.

rothman wrote:
Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4 Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our noise.

So use parallel?

No, you cannot parallel modern amps, as I said.

You can bridge them, if the amplifiers are capable of bridging. That gives
you considerably more power.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

"rothman" wrote
Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps
put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4
Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our noise.

So use parallel?

The first thing I would experiment is with the placement of all of your
speakers. (Including those on guitar amps etc.)

A speaker on a guitar amp can be heard much more clearly when it is
reasonably close to and pointing at your ear. There are stands which are
made to elevate and tilt combo's but you can also use chairs and tables etc.
or just lean the amp back against a wall.

Now that everyone has their amp pointed in the right direction you will find
that the amplifiers can all be turned down a few notches and everyone can
hear a lot better. Please remember this when performing live too.

Oh and if your 12" speakers are still too soft you can add another pair in
parrallel or powered by a seperate amp.
You might also think about arranging your music so that their is some space
for the vocals.

--
Anthony Gosnell

to reply remove nospam.

anthony wrote:

Oh and if your 12" speakers are still too soft you can add another pair in
parallel or powered by a separate amp.

That is another question. My speakers do have an extra jack that it says is
wired in parallel. Can you simply daisy chain speakers without adding
resistance on one amp? Is this a fire hazard too? They are 8 Ohm speakers.
Thanks

Doug






"anthony.gosnell" wrote in message
...
"rothman" wrote
Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps
put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4
Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our
noise.

So use parallel?

The first thing I would experiment is with the placement of all of your
speakers. (Including those on guitar amps etc.)

A speaker on a guitar amp can be heard much more clearly when it is
reasonably close to and pointing at your ear. There are stands which are
made to elevate and tilt combo's but you can also use chairs and tables
etc.
or just lean the amp back against a wall.

Now that everyone has their amp pointed in the right direction you will
find
that the amplifiers can all be turned down a few notches and everyone can
hear a lot better. Please remember this when performing live too.

Oh and if your 12" speakers are still too soft you can add another pair in
parrallel or powered by a seperate amp.
You might also think about arranging your music so that their is some
space
for the vocals.

--
Anthony Gosnell

to reply remove nospam.

rothman wrote:
anthony wrote:

Oh and if your 12" speakers are still too soft you can add another pair in
parallel or powered by a separate amp.

That is another question. My speakers do have an extra jack that it says is
wired in parallel. Can you simply daisy chain speakers without adding
resistance on one amp? Is this a fire hazard too? They are 8 Ohm speakers.

If you parallel two 8 ohm speakers, they are presenting a 4 ohm load to
the amplifier.

This is fine if your amp is rated to handle a 4 ohm load, though when you
bridge the amplifier you are only able to drive twice the impedance that
each side of the amplifier can drive.

If your problem is that you cannot get enough power into the speaker, running
multiple speakers off one amp will make your problem worse.

All this stuff is discussed in the FAQ, or in the Yamaha Sound Reinforcement
Handbook.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

rothman wrote:
anthony wrote:

Oh and if your 12" speakers are still too soft you can add another pair in
parallel or powered by a separate amp.

That is another question. My speakers do have an extra jack that it says is
wired in parallel. Can you simply daisy chain speakers without adding
resistance on one amp? Is this a fire hazard too? They are 8 Ohm speakers.

If you parallel two 8 ohm speakers, they are presenting a 4 ohm load to
the amplifier.

This is fine if your amp is rated to handle a 4 ohm load, though when you
bridge the amplifier you are only able to drive twice the impedance that
each side of the amplifier can drive.

If your problem is that you cannot get enough power into the speaker, running
multiple speakers off one amp will make your problem worse.

All this stuff is discussed in the FAQ, or in the Yamaha Sound Reinforcement
Handbook.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

anthony wrote:

Oh and if your 12" speakers are still too soft you can add another pair in
parallel or powered by a separate amp.

That is another question. My speakers do have an extra jack that it says is
wired in parallel. Can you simply daisy chain speakers without adding
resistance on one amp? Is this a fire hazard too? They are 8 Ohm speakers.
Thanks

Doug






"anthony.gosnell" wrote in message
...
"rothman" wrote
Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps
put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4
Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our
noise.

So use parallel?

The first thing I would experiment is with the placement of all of your
speakers. (Including those on guitar amps etc.)

A speaker on a guitar amp can be heard much more clearly when it is
reasonably close to and pointing at your ear. There are stands which are
made to elevate and tilt combo's but you can also use chairs and tables
etc.
or just lean the amp back against a wall.

Now that everyone has their amp pointed in the right direction you will
find
that the amplifiers can all be turned down a few notches and everyone can
hear a lot better. Please remember this when performing live too.

Oh and if your 12" speakers are still too soft you can add another pair in
parrallel or powered by a seperate amp.
You might also think about arranging your music so that their is some
space
for the vocals.

--
Anthony Gosnell

to reply remove nospam.

anthony.gosnell wrote:

Now that everyone has their amp pointed in the right direction you will find
that the amplifiers can all be turned down a few notches and everyone can
hear a lot better. Please remember this when performing live too.


You're not a guitar player, are you?

Output volume level has almost nothing to do with where a guitarist
sets his amplifier's gain control.


ulysses

anthony.gosnell wrote:

Now that everyone has their amp pointed in the right direction you will find
that the amplifiers can all be turned down a few notches and everyone can
hear a lot better. Please remember this when performing live too.


You're not a guitar player, are you?

Output volume level has almost nothing to do with where a guitarist
sets his amplifier's gain control.


ulysses

"rothman" wrote
Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps
put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4
Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our noise.

So use parallel?

The first thing I would experiment is with the placement of all of your
speakers. (Including those on guitar amps etc.)

A speaker on a guitar amp can be heard much more clearly when it is
reasonably close to and pointing at your ear. There are stands which are
made to elevate and tilt combo's but you can also use chairs and tables etc.
or just lean the amp back against a wall.

Now that everyone has their amp pointed in the right direction you will find
that the amplifiers can all be turned down a few notches and everyone can
hear a lot better. Please remember this when performing live too.

Oh and if your 12" speakers are still too soft you can add another pair in
parrallel or powered by a seperate amp.
You might also think about arranging your music so that their is some space
for the vocals.

--
Anthony Gosnell

to reply remove nospam.

Thank you Scott...I was worried about starting a fire.

I want to get more power to two 12" speakers with an 8 Ohm load. My amps put
out best at 4 Ohms. It's for rehearsal and the 200 watts stereo from a 4 Ohm
amp to 8 Ohm speakers is not loud enough to do vocals over all our noise.

So use parallel?

Doug



"Scott Dorsey" wrote in message
...
rothman wrote:

I wish to connect two power amps together. Do I use parallel on both amps
and control volume on the bottom amp?

In general, paralleling modern transistor amps is a good way to start a
fire.

You can bridge some amplifiers, but not all. Bridging gives you twice the
voltage output, but no more current, so if your goal is to drive lower Z
loads, it won't help. But if you need to sink more power into an
eight-ohm
load with amps that can drive four ohms, bridging is the way to go.

What are you trying to do?
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

rothman wrote:

I wish to connect two power amps together. Do I use parallel on both amps
and control volume on the bottom amp?

In general, paralleling modern transistor amps is a good way to start a fire.

You can bridge some amplifiers, but not all. Bridging gives you twice the
voltage output, but no more current, so if your goal is to drive lower Z
loads, it won't help. But if you need to sink more power into an eight-ohm
load with amps that can drive four ohms, bridging is the way to go.

What are you trying to do?
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."