Originally Posted by peniku8
I don‘t know how much of an impact resistors have on THD, but @notnyt
advised against it. I‘m using a voltage divider network for that reason.
An L-pad on the AST would be one way to solve the issue, but an Autoformer would be better (but more expensive and maybe difficult to source, depending on where you are). It‘s true that pro devices operate at a different voltage, which will make the apparent noise floor higher when using it in combination with consumer gear.
Pro gear usually has a 0dbFS (digital domain) reference which translates to somewhere around 19-24dbU, depending on the manufacturer. Now if your AVR outputs 1dbU at max (look up its specs), your noise floor will be 20db higher than what it could possibly be.
I didn‘t catch it, are you using XLR or RCA from the AVR/Preamp?
A minidsp is not pro gear and it has exact the same noise floor as this.
Im using RCA on the minidsp and solved it with in line attenuators from parts express (Harrison labs). Been living with that for two years and sound is outstanding, never measured any appreciable I'll effects from them. With the PA2 it will be xlr.
I've ordered 9x 10db xlr attenuators from parts express last night. Will see what happens when they get here. Hopefully it's enough.
Also good news, Sinbosen is going to make a Venu360 clone after I asked them to yesterday, they will be doing it in about two months. This unit I have really is built exceptionally well. I would have confidence in picking up a venu360 from them when they make one.
This PA2 can be used for subs down the track. When these attenuators come though I will use it for my mains for a while. I really should pick up a decent oscilloscope and test the actual noise floor of this and the minidsp.
Emotiva XPA7 Gen2:
Gain: 29 dB.
Input Impedance: 33 kohms (balanced). 23.5 kohms (unbalanced).
Input Impedance >50 kohm
Output Impedance 120 Ω
Max Output +20dBu
A/D Dynamic Range 112 dB A-weighted, 110 dB unweighted
Type IV Dynamic Range 123 dB with transient material, A-weighted, 22kHz BW; 121 dB with transient material, unweighted, 22kHz BW; 115 dB typical with program material, A-weighted, 22kHz BW
Dynamic Range >110 dB A-weighted, >107dB unweighted
THD+Noise 0.003% typical at +4dBu, 1kHz, 0dB input gain
Interchannel Crosstalk < -110 dB, -120dB typical (input-to-output: < -100 dB)
With specs like that I really shouldnt be able to hear anything.
The MiniDSP has similar specs too.