Amp 6 in Parllell?

[dansolow]

Can outputs of the Amp 6 be connected in Parallell?

If so, would the minimum safe load be 2 ohms? Or 4?

I'm thinking two of these with some passive line level xo's could power a small sat-sub system.

The other alternative is to get a sub driver with dual voice coils.

Dan

[emedia4u]

You will be better off using AMP9 in parallel mode.

[Kocsu]

I was wondering the same question, some theory

AMP9 has an auto DC-offset adjustment feature that AMP6 doesn't have

I don't think it's a good idea to parallel two voltage sources with different levels (even with miliVolts difference)

[dansolow]

Thanks for the input...Good point on the DC offset.

From your response, I looked around the forum, and here is what I found in regard to the Amp 5/10:

From Xenob: After doing some reading, paralleling the outputs of amp5 does not seem to be a good idea. At an 4 Ohm load, after paralleling each channel would see only 8 Ohm therefore the power increase may not be satisfactory. Besides Wiki writtes:
"Each amplifier must have as little output offset as possible (ideally zero offset) at no signal, otherwise the amplifier with the higher offset will try to drive current into the one with lesser offset thereby increasing dissipation. Equal offsets are also not acceptable since this will cause unwanted current (and dissipation) in the load. These are taken care of by adding an offset nulling circuit to each amplifier."
This would obviously even complicate things.
So paralleling only seems agood idea with AMP9 ?!


From Jan:
...You could paralell outputs of AMP5. There is output nulling adjustment for each channel on the board. It may be a good idea to swap the supplied trimmers for multiturn trimmers for more exact offset nulling in this case. AMP9 does this nulling automatically every time it is un-muted, but manual trimming is at least as accurate, and usually very stable once done.

The reason to paralell output is when one channel is not capable of delivering enough current. For AMP5 this would be in case of 30V or more rails and below 4 ohm loads, i.e 2 ohm loads. If you paralell two 4 ohm speakers, maybe a simpler solution is to use the channels and speakers separately, one on each amp output.

So the answer for my solution is stereo into a dual 4 ohm vc driver, from which it seems I would get the same power as paralelled into 2.

The other answer it to wind 8 more toroids and build another amp 9.

Dan

quote:Originally posted by Kocsu
[br]I was wondering the same question, some theory

AMP9 has an auto DC-offset adjustment feature that AMP6 doesn't have

I don't think it's a good idea to parallel two voltage sources with different levels (even with miliVolts difference)

[Kocsu]

an even with AMP9, datasheet says 25mV level after auto-adjustment would be normal

I have AMP9 with inputs/outputs paralleled in pairs, I measured 0mV in one channel but about 100mV in the second one!!
still pending to check is everything is OK in that pair of channels

note.- SLEEP is fixed at +5V and I play only with MUTE (as the unmute action is the one that triggers auto dc-adjustment)
AMP9 is working at 24VDC

[dansolow]

This is off topic, but how hot does you amp 9 get at 24V?

Mine gets HOT at 20v running only two channels at moderate volume.

I would be great to hear your input, here is a link to that thread:

http://www.41hz.com/forums/topic.asp?TOPIC_ID=1029

I have already followed your plan on the pins (only using mute), and that part works great now.

quote:Originally posted by Kocsu
[br]an even with AMP9, datasheet says 25mV level after auto-adjustment would be normal

I have AMP9 with inputs/outputs paralleled in pairs, I measured 0mV in one channel but about 100mV in the second one!!
still pending to check is everything is OK in that pair of channels

note.- SLEEP is fixed at +5V and I play only with MUTE (as the unmute action is the one that triggers auto dc-adjustment)
AMP9 is working at 24VDC