Eris E8 power mod - dual DC power possible?

asymcon

Member
2016-12-27 9:05 pm
Hi there,
sorry for posting in wrong category if that's the case - the question regards to active studio monitor - but the part I'm interested in is the amplifier, more specifically the power section.


I purchased Eris E8, with which I'm fairly happy with. Bit too much white noise, but bearable. My question is - is it possible to bypass the 230V and power it directly from DC, so that for portable applications there won't be a need for inverter?

I suppose that's very general question without looking at schematics, for which I couldn't find any. Still, if the amp operates in push pull configuration, say +30V and -30V could be introduced at some point in the chain to get it fully working.



Where to start with this? :p
 
Among the handful of actice speaker schematics that I have, I did indeed find some that are regulating down their main supplies to +/-15 V. Mainly smaller (e.g. 5") models. Even then, at least one had AC detection circuitry. I found an 8" with two different transformer taps for 3 different sets of supplies, so no luck with this one.

You'll have to take a peek inside and perform some reverse-engineering, I'm afraid.
 
I purchased Eris E8, with which I'm fairly happy with. Bit too much white noise, but bearable.

That unit's specs don't mention noise (or input level even), which is worrying.

Since it has volume control built in, try turning that down and sending it a higher level signal, and if using one of the balanced inputs try changing to unbalanced - that might reduce noise.

Many active speakers have poor noise floors I'm afraid, and its something you definitely can notice in a studio monitor. There is no real excuse for it though.

I suspect their level adjustment circuit isn't great (ie passive).