UcD400 and high level sub input

chrisb03 · 11th May 2007, 10:13 AM

Sorry if this has already been asked, I did a search but could not find a answer to my question.

I have build a Ucd400 two channel amp in the past. They currently drive a pair of Sonus Faber Concerto. I have a cd player supplying spdif to a P3A DAC which then goes to the amp via a passive volume pot.

I bought my self a sub today and trying to work out the best way to setup.

Can the UcD400 drive the Concerto's and also supply high level signal to the high level sub inputs? Is the UcD ouput stage ok for this kind of setup?

I would prefer to run an active cross over but can't afford one, unless there is a nice high quality kit available.

Chris

Workhorse · 11th May 2007, 10:26 AM

Why donot you use Line level inputs of Sub???

chrisb03 · 11th May 2007, 10:28 AM

I don't have any outputs on dac. Are you saying I should parrallel the line level outputs from the DAC to go to both the UcD and Sub?

Workhorse · 11th May 2007, 10:30 AM

Quote:

Originally posted by chrisb03
I don't have any outputs on dac. Are you saying I should parrallel the line level outputs from the DAC to go to both the UcD and Sub?

Yes you could parallel....what is the output impedance of your dac

chrisb03 · 11th May 2007, 10:36 AM

Output impedance is 100 ohms, but I have the passive volume pot on the output. I would be parralleling after the pot. I can't remember what size pot I have, it's about 10K

Workhorse · 11th May 2007, 10:39 AM

Parallel before pot and adjust the sub level accordingly....

chrisb03 · 11th May 2007, 10:42 AM

That would mean I would have to adjust the sub volume at the same time I adjust the passive pot volume. That doesn't make sense.

Workhorse · 11th May 2007, 10:45 AM

hahaaa, ok then what is the input impedance of your UCD and sub...

chrisb03 · 11th May 2007, 10:50 AM

ummmmmm... don't know.

Am I missing something here. I'm not sure I understand. Are you saying depending on input impedance of ucd and sub that the signal going to sub will adjust linearly with the pot even though it's connected before the pot?

Workhorse · 11th May 2007, 10:56 AM

No you misunderstood....

Ok, if you have access to say 1K-5K pot then you could able to connect both UCD and SUB after the pot....

11th May 2007, 10:13 AM	#1
chrisb03 diyAudio Member Join Date: Oct 2004 Location: Sydney	UcD400 and high level sub input Sorry if this has already been asked, I did a search but could not find a answer to my question. I have build a Ucd400 two channel amp in the past. They currently drive a pair of Sonus Faber Concerto. I have a cd player supplying spdif to a P3A DAC which then goes to the amp via a passive volume pot. I bought my self a sub today and trying to work out the best way to setup. Can the UcD400 drive the Concerto's and also supply high level signal to the high level sub inputs? Is the UcD ouput stage ok for this kind of setup? I would prefer to run an active cross over but can't afford one, unless there is a nice high quality kit available. Chris __________________ My UcD400 amplifier http://members.optusnet.com.au/myamp

11th May 2007, 10:28 AM	#3
chrisb03 diyAudio Member Join Date: Oct 2004 Location: Sydney	I don't have any outputs on dac. Are you saying I should parrallel the line level outputs from the DAC to go to both the UcD and Sub? __________________ My UcD400 amplifier http://members.optusnet.com.au/myamp

11th May 2007, 10:36 AM	#5
chrisb03 diyAudio Member Join Date: Oct 2004 Location: Sydney	Output impedance is 100 ohms, but I have the passive volume pot on the output. I would be parralleling after the pot. I can't remember what size pot I have, it's about 10K __________________ My UcD400 amplifier http://members.optusnet.com.au/myamp

11th May 2007, 10:42 AM	#7
chrisb03 diyAudio Member Join Date: Oct 2004 Location: Sydney	That would mean I would have to adjust the sub volume at the same time I adjust the passive pot volume. That doesn't make sense. __________________ My UcD400 amplifier http://members.optusnet.com.au/myamp

11th May 2007, 10:50 AM	#9
chrisb03 diyAudio Member Join Date: Oct 2004 Location: Sydney	ummmmmm... don't know. Am I missing something here. I'm not sure I understand. Are you saying depending on input impedance of ucd and sub that the signal going to sub will adjust linearly with the pot even though it's connected before the pot? __________________ My UcD400 amplifier http://members.optusnet.com.au/myamp


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

11th May 2007, 10:26 AM	#2
Workhorse diyAudio Member Join Date: Dec 2004	Why donot you use Line level inputs of Sub???

11th May 2007, 10:39 AM	#6
Workhorse diyAudio Member Join Date: Dec 2004	Parallel before pot and adjust the sub level accordingly....

11th May 2007, 10:45 AM	#8
Workhorse diyAudio Member Join Date: Dec 2004	hahaaa, ok then what is the input impedance of your UCD and sub...

11th May 2007, 10:56 AM	#10
Workhorse diyAudio Member Join Date: Dec 2004	No you misunderstood.... Ok, if you have access to say 1K-5K pot then you could able to connect both UCD and SUB after the pot....

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
speaker level input vs line level question	crippledchicken	Subwoofers	4	17th July 2007 03:36 AM
JBL Sub high level input only	Dr Moreaux	Subwoofers	5	22nd April 2007 03:04 AM
Sub-woofer high level input	StalfoS	Solid State	2	15th February 2007 11:00 PM
lesser of two evils, high level -> line level, digital volume control	mazurek	Solid State	3	19th November 2006 12:25 AM
High input level LM3886 amp ?	bibster	Chip Amps	2	13th October 2006 07:13 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read