PreenFM > preenfm2 and preenfm3

[SOLVED] Very little bass in sound + gated noise = problem with build?

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prontold:
Hi all,

   I built a PreenFM2 a month or two ago. When I finished, I thought it had some good sounds but noticed a lack of low end response. I thought maybe that was just the nature of the beast. Revisiting it now, though, I noticed that there seems to be some gated noise whenever notes are triggered, and that the bass boost function just distorts the sound when under a certain frequency without audibly increasing the low end. Does this indicate a problem at the DAC?

Xavier:
Hi,

Difficult to say.
Could you post some mp3 using some of the presets where i can here what you describe ?
I'll compare it with my preenfm2.

Xavier

prontold:
Thanks Xavier

I went ahead and recorded a couple of samples. The first is just scrolling through the first few presets in the PREEN bank. The second is playing the RK bass patch and experimenting with the bass boost filter. I noticed I can actually get a boost if I back the gain down, but the low end still seems like maybe it is attenuated relative to the high frequencies

https://dl.dropboxusercontent.com/u/8335661/Preen%20presets.mp3


https://dl.dropboxusercontent.com/u/8335661/RK%20Bass%20%2B%20Boost.mp3

Xavier:

That's weird.. but it's difficult to know without knowing which notes you play.
I'll compare with my preen tonight.

I don't think it can be the DAC.
But more the resistors/capacitors after the DAC...
There's an antialiasing 22Khz low pass filter at the amp op level. Any wrong value/shortcut around there ?
http://ixox.fr/preenfm2/the-pcb-r5/pfm2_17/#main

prontold:
Thanks Xavier. I'll have a look when I get home tonight. As for notes, I almost always play in C minor/Eb major with some extra major chords :-\

I guess there's a bit of C major in these too

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