CVX-2 : covox adapter

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CVX-2 : covox adapter

Postby dreamblaster » 2016-12-26 @ 13:09

Hi,
I am testing 2 covox adapter PCB prototypes :
CVX-1 : through hole, 1% resistors (2 different values)
CVX-2 : SMD adapter, 0.1% resistors or 1% resistors (all same value, same batch, for best accuracy)

I have been playing with a low pass filter cap and like your feedback, what sounds best ?
I tested with crystal dream demo on the CVX2 (0.1%) :

10nF ? https://youtu.be/TVaPQ41huBY
100nF ? https://youtu.be/wcqD_SzOz_c
5nF ? https://youtu.be/w8gLaZD46ew (ADDED)
1nF ? https://youtu.be/RaZH5dXw1eY
no cap ? https://youtu.be/bn-spjT_A-A


What do you think sounds best ?
Which other demos / games / music software (that support covox adapter) are recommended to try with the CVX adapters ?
Attachments
CVX2.JPG
CVX1.JPG
Last edited by dreamblaster on 2016-12-26 @ 14:32, edited 2 times in total.
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Re: CVX-2 : covox adapter

Postby stamasd » 2016-12-26 @ 13:32

That is a very nice addition to your lineup.

I have a hard time deciding if I like the 10nF or 1nF more. The 100nF sounds very subdued with a lot of high frequencies loss, and the no-cap is a bit too harsh IMHO.
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Re: CVX-2 : covox adapter

Postby Scali » 2016-12-26 @ 13:41

Yea, 100nF is definitely too muffled.
I think 10nF is acceptable. It affects the sound slightly, but it remains bright enough.
The difference between 1nF and no-cap seems negligible.

I think my vote goes to 10nF.
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Re: CVX-2 : covox adapter

Postby Beegle » 2016-12-26 @ 13:55

I prefer rougher sound in general.
100nF is way too muffled and as said already, loses many high frequencies.
10nF is a little bit too soft to my personal taste.
1nF sounds right to me.
unfiltered is acceptable to me, but may not be to other ears. So 1nF to me seems to be the balance.
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Re: CVX-2 : covox adapter

Postby stamasd » 2016-12-26 @ 13:58

Can you test with 4.7nF or 5.6nF? Though that would be nut-picking. :)
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Re: CVX-2 : covox adapter

Postby dreamblaster » 2016-12-26 @ 13:59

Yeah I will test with 4.7nF, will order such caps. This may be the sweet spot.
Will add a video with 4.7nF as soon as I have them.
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Re: CVX-2 : covox adapter

Postby PhilsComputerLab » 2016-12-26 @ 14:01

10uF gets my vote :)
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Re: CVX-2 : covox adapter

Postby stamasd » 2016-12-26 @ 14:01

You can solder 2 of the 10nF caps in series, that will give you roughly 5nF for a quick test.
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And a read and a write,
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Re: CVX-2 : covox adapter

Postby dreamblaster » 2016-12-26 @ 14:05

yeah good idea
will do, will test with 2 x 10nF in series == 5nF
then later will test with 4.7nF, should sound the same
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Re: CVX-2 : covox adapter

Postby keropi » 2016-12-26 @ 14:16

I like all of them ? LOL I'd say 10nf as well - just to be on middle ground
there is also Pinball Fantasies that has some great mod music , maybe you can test with that as well?
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Re: CVX-2 : covox adapter

Postby Scali » 2016-12-26 @ 14:17

dreamblaster wrote:Which other demos / games / music software (that support covox adapter) are recommended to try with the CVX adapters ?


Crystal Dream 2 also has LPT DAC support I believe, and should have a better quality mixing routine than Crystal Dream 1.
Fast Tracker II also has LPT DAC support (select 'Sound Player' on LPT1, even has an LPT1+LPT2 stereo option), with the same routine as CD2 I believe. Should be great for playing any MOD or XM song.
Inertia Player is a player with support for LPT DAC that should play a wide range of tracker formats.
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Re: CVX-2 : covox adapter

Postby dreamblaster » 2016-12-26 @ 14:32

okay, I tested with 5nF (2x10nF in series)
https://youtu.be/w8gLaZD46ew
(I'll add the link to the first post)
Is this better than 10nF or 1nF ?
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Re: CVX-2 : covox adapter

Postby stamasd » 2016-12-26 @ 14:41

It sounds good to me.
I/O, I/O,
It's off to disk I go,
With a bit and a byte
And a read and a write,
I/O, I/O
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Re: CVX-2 : covox adapter

Postby Scali » 2016-12-26 @ 14:44

dreamblaster wrote:okay, I tested with 5nF (2x10nF in series)
https://youtu.be/w8gLaZD46ew
(I'll add the link to the first post)
Is this better than 10nF or 1nF ?


It's slightly more subtle than the 10nF, but still takes off a bit of the brightness/harshness.
I think 5nF might be the way to go.
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Re: CVX-2 : covox adapter

Postby keropi » 2016-12-26 @ 16:09

I vote for 5nf too
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Re: CVX-2 : covox adapter

Postby dreamblaster » 2016-12-26 @ 16:29

Very good, I ordered 4.7nF caps.
Thanks for your help, I will pm you all ;-)
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Re: CVX-2 : covox adapter

Postby James-F » 2016-12-26 @ 17:38

I think we are forgetting that the filtering is there to avoid terrible sounding aliasing, just like in the sound blaster cards.
Yes, high value will not sound good with music when compared to how HiFi modern music sounds, BUT to low value will make aliasing very clear in sound effect.
Most of the audio meant to be played on the Covox is 11kHz, thus everything above that is filtered out, again, just like in the SB card.

I think some game with sound and music should be a more fair comparison.
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Re: CVX-2 : covox adapter

Postby stamasd » 2016-12-26 @ 17:54

Here's an idea: add 3 or 4 different caps and a jumper head... let everyone choose which one they like.
I/O, I/O,
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With a bit and a byte
And a read and a write,
I/O, I/O
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Re: CVX-2 : covox adapter

Postby gdjacobs » 2016-12-26 @ 18:43

Add a two position clip socket and people can just wham in whatever barrel caps suit them.
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Re: CVX-2 : covox adapter

Postby Kamerat » 2016-12-26 @ 19:42

dreamblaster wrote:Which other demos / games / music software (that support covox adapter) are recommended to try with the CVX adapters ?

Pinball Fantasies.
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