Double Bass Class D "digital" amps. DB player Opinions on performance

[bryanspkr]

The MB200 has an inherently contoured (scooped) response curve when the EQ knobs are centered. I found that it can be dialed reasonably flat with these settings:

Contour = Off
Treble = 10:00
Hi-Mid = 2:00
Lo-Mid = 1:00
Bass = 10:00

I marked these settings on my MB200 with a Sharpie. While I don't worship at the altar of flat response, my speaker was designed to sound good with a flat amp, and it's handy to know the flat settings of each amp when comparing between them or for non-bass uses.

Just curious. Did you measure where its flat or just estimate the dial position from the published +/- dB for each control?

 

[Steve Freides]

It was the AI power amp that was problematic.

AI has changed input impedance over time. I think the older heads were 10 mohm but now the quarter inch is 1 mohm. Don't knowhowsignificant that difference is.

The XLR input is about 600 ohm.

-S-

 

[bryanspkr]

AI has changed input impedance over time. I think the older heads were 10 mohm but now the quarter inch is 1 mohm. Don't knowhowsignificant that difference is.

The XLR input is about 600 ohm.

-S-

I was using the same Pre (AI) and two different power amps.

Input impedance on the later series preamps is not as high as the first 2 series. Actually they used to have a HiZ and a LowZ.
Now the 1/4 is a bit of a compromise.