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Old Yesterday, 02:38 PM   #8321
M M is offline M M
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Default ACA Parallel mono configuration, close amp matching needed?

Hi,

according to the ACA V1.6 Operation modes (link below) the parallel mono configuration would fit my needs the best with more power into 4 ohms and less distorsion. However, I understand that parallel mono may require the amplifiers to be closely matched (e.g. gain and DC offset) to work well. Close matching does not seem to be required when the amp use current drive.

Can anyone please explain current drive in the context of the ACA?

Does the ACA 1.6 use current drive or do the amps need to be closely match using the parallel mono configuration?

https://cdn.shopify.com/s/files/1/10...ation_RevA.pdf

Regards,
M
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Old Yesterday, 02:49 PM   #8322
Zen Mod is online now Zen Mod  Serbia
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Amp Camp Amp - ACA
what's current drive?
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Old Yesterday, 02:51 PM   #8323
Mooly is offline Mooly  United Kingdom
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The ACA always has zero DC offset by default... it is AC coupled. So no problem there.

Amplifiers with high damping factor/low output impedance do require good gain matching and also some form of current sharing (such as low value series output resistors) for parallel operation.

As far as I am aware, the ACA's low damping factor/high output impedance render such precautions as unnecessary.

The ACA would be classed as voltage drive, however the high output impedance means that the output voltage is subject to being altered significantly by the impedance of the connected load.
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Old Yesterday, 02:57 PM   #8324
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Zen Mod View Post
what's current drive?
It usually means a trans-conductance type of amplifier. Look how the feedback is arranged in the first two diagrams:

Amplifier topologies for current-drive | Current-Drive - The Natural Way of Loudspeaker Operation

http://www.firstwatt.com/pdf/art_cs_amps.pdf

Joe Rasmussen "Trans-Amp" - 40 Watt Transconductance "Current Amplifier"
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Old Yesterday, 03:30 PM   #8325
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I know that ........ but I was sorta confused what exactly OP is asking , using formulation "Does the ACA 1.6 use current drive"
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Old Yesterday, 05:02 PM   #8326
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Quote:
Originally Posted by Zen Mod View Post
I know that ........ but I was sorta confused what exactly OP is asking , using formulation "Does the ACA 1.6 use current drive"
Sorry , bad wording on my part (and lack of knowledge). I was referring to type of amplifier and topology.
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