Help! DAC got no Bass

aliwakil · 14th April 2004, 01:41 AM

I've just completed the DAC based on the schematic from the RJM site - music has got detail and vocals sound fine but bass is very much lacking. Component values used are as specified. Tried increasing the power supply cap to 1000uf, dropped the 1543 supply voltage to 8V and still no difference. Any idea what's happening ? Appreciate the help. Thanks. Schematic link below.

http://www.geocities.com/rjm003.geo/...o/diy_dac.html

mb · 14th April 2004, 02:36 AM

Yo! Fancy seeing you here...

What are you connecting the dac to? Try posting on echoloft, and see if any of the local kaypohs can help.

maartentje · 14th April 2004, 11:13 AM

Hey There,

I have the same problem, I connect it to my Marantz CD4000 and the bass and the 3d image is not very good. My Sony CDP-195 is unmodify and sound much beter..... I don't know what the problem is. Please Help

mb · 14th April 2004, 01:22 PM

A possible answer is that the passive I/V output is having problems driving the next stage (the preamp, or worse the passive attenuator). I had that issue, and it was solved by having a buffer on my gainclone, and using parallel dacs.

audionut · 14th April 2004, 01:39 PM

I get tremendous bass drive out of my DDDAC 1543...I am using the 8 parrallel chip configuration which produces plenty of drive...also...I liked the effects of reclocking with Guido Tent's reclocker.

Mad_K · 14th April 2004, 05:52 PM

Quote:

Originally posted by mb
A possible answer is that the passive I/V output is having problems driving the next stage (the preamp, or worse the passive attenuator). I had that issue, and it was solved by having a buffer on my gainclone, and using parallel dacs.

I have the same experience, and solved it with going to active IV using opa2604. Huge improvement, especially in the bass department.

Peter Daniel · 14th April 2004, 06:03 PM

Passive I/V can also have good bass, but the choice of components is more critical. The battery improves bass substantially as well.

I can't complain that my passive I/V stage is lacking in that dept. Actually, I was commented that the bass was rather amazing. I'd say that PS is quite important for good bass performance.

maartentje · 14th April 2004, 07:36 PM

Hey There,

I have fix my problem... Before the transformator i had a AC filter self made it and i have cut the filter and know it sound amazing

so good so fast so clear...... I have just finished my Clone of the Bottlehead Foreplay its just amazing how this al sound together....

I am sorry for my English....

My setup:
Marantz CD4000 Cd-Player
Cs8412-Tda1543 (all caps are marcon) Dac
Bottlehead Foreplay Pre-Amplifier
John Linsley Hood Amplifier
Vifa 2-way (D27TG+17WP) Speakers

Elso Kwak · 14th April 2004, 07:54 PM

Quote:

Originally posted by maartentje
Hey There,

I have fix my problem... Before the transformator i had a AC filter self made it and i have cut the filter and know it sound amazing so good so fast so clear......

Hello maartentje, Now this get's interesting! What kind of coil or AC filter did you manage to make?
Are you familiar with the Jon Risch filter?

analog_sa · 14th April 2004, 08:48 PM

Quote:

Before the transformator i had a AC filter

You have thus learnt a valuable lesson - a mains filter usually does more harm than good.

14th April 2004, 01:41 AM	#1
aliwakil diyAudio Member Join Date: Mar 2004 Location: Singapore	Help! DAC got no Bass I've just completed the DAC based on the schematic from the RJM site - music has got detail and vocals sound fine but bass is very much lacking. Component values used are as specified. Tried increasing the power supply cap to 1000uf, dropped the 1543 supply voltage to 8V and still no difference. Any idea what's happening ? Appreciate the help. Thanks. Schematic link below. http://www.geocities.com/rjm003.geo/...o/diy_dac.html

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14th April 2004, 02:36 AM	#2
mb diyAudio Member Join Date: Dec 2002 Location: Singapore	Yo! Fancy seeing you here... What are you connecting the dac to? Try posting on echoloft, and see if any of the local kaypohs can help.

14th April 2004, 11:13 AM	#3
maartentje diyAudio Member Join Date: Jun 2002 Location: USA, FL	Hey There, I have the same problem, I connect it to my Marantz CD4000 and the bass and the 3d image is not very good. My Sony CDP-195 is unmodify and sound much beter..... I don't know what the problem is. Please Help

14th April 2004, 01:22 PM	#4
mb diyAudio Member Join Date: Dec 2002 Location: Singapore	A possible answer is that the passive I/V output is having problems driving the next stage (the preamp, or worse the passive attenuator). I had that issue, and it was solved by having a buffer on my gainclone, and using parallel dacs.

14th April 2004, 01:39 PM	#5
audionut diyAudio Member Join Date: Jan 2002 Location: Cleveland ohio	I get tremendous bass drive out of my DDDAC 1543...I am using the 8 parrallel chip configuration which produces plenty of drive...also...I liked the effects of reclocking with Guido Tent's reclocker.

14th April 2004, 06:03 PM	#7
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Passive I/V can also have good bass, but the choice of components is more critical. The battery improves bass substantially as well. I can't complain that my passive I/V stage is lacking in that dept. Actually, I was commented that the bass was rather amazing. I'd say that PS is quite important for good bass performance.

14th April 2004, 07:36 PM	#8
maartentje diyAudio Member Join Date: Jun 2002 Location: USA, FL	Hey There, I have fix my problem... Before the transformator i had a AC filter self made it and i have cut the filter and know it sound amazing so good so fast so clear...... I have just finished my Clone of the Bottlehead Foreplay its just amazing how this al sound together.... I am sorry for my English.... My setup: Marantz CD4000 Cd-Player Cs8412-Tda1543 (all caps are marcon) Dac Bottlehead Foreplay Pre-Amplifier John Linsley Hood Amplifier Vifa 2-way (D27TG+17WP) Speakers