PA-1 wierd auto on behavior

[anannra]

So recently purchased a quad set of PA-1's, the class D mono blocks.

Bi-amped for LF/HF duty.

X-over is done with a DSP, and so each amp only sees the audio range it's suppose to see. In short, the x-over point in 1Khz.

So here's the wierd behaviour.

All amps are set to "auto-on".

So when I play music, only the amps dedicate to LF duty come on, and not the HF amps.

Crank up the volume, and there's no change in behaviour.

Swamp the amps around, and of course things are reversed. Wondering if there's a frequency component to the auto-on feature.

Any one else seeing this?

[KeithL]

Interesting....

This is the first we've heard of this... but I think you may be the first person we've heard from using them this way.

The turn-on control is built into the iCEPower module itself... so we don't get to see all the circuit details.

Note that, even when playing loudly, most of the power goes to the lower frequencies, so there may simply not be much signal power above 1 kHz.

(It's also possible that there is some sort of slow-down circuitry included in the turn-on circuitry to avoid false triggering. If so, it may reduce or block sensitivity to only higher frequencies.)

I would suggest just setting them to "always on".

They draw very little power - even in their "on/idle" state).

Feb 3, 2020 1:43:02 GMT -5 anannra said:

So recently purchased a quad set of PA-1's, the class D mono blocks.

Bi-amped for LF/HF duty.

X-over is done with a DSP, and so each amp only sees the audio range it's suppose to see. In short, the x-over point in 1Khz.

So here's the wierd behaviour.

All amps are set to "auto-on".

So when I play music, only the amps dedicate to LF duty come on, and not the HF amps.

Crank up the volume, and there's no change in behaviour.

Swamp the amps around, and of course things are reversed. Wondering if there's a frequency component to the auto-on feature.

Any one else seeing this?

[anannra]

this is what I'm assuming as well.

It would be nice though to have a seperate remote trigger on these little amps.... my XMC-1 does have 4 of them