ucd180 enough power?

bcrazy · 19th May 2006, 12:58 PM

My sansui au-x701 just blew up it's power supply. I may decide on building a new amplifier with 2xucd180 or 2xucd400. The question is do i need the power of the ucd400.

The sansui was 2x100w at 8 ohm, and had very good bass control. I also uprated the power supply condensors from 2x15.000uF to 2x75.000uF.

For me the sansui had just enough power for my speakers.

Will the ucd180 bew powerful enough or should i go for the 400?

richie00boy · 19th May 2006, 01:39 PM

Well your Sansui was 100W into 8 ohms, the UcD180 is 180W into 4 ohms so potentially could be as low as 90W into 8 ohms. I doubt you will notice any difference. The Sansui is probably a bit over rated anyway, and I very much doubt it can do 180W into 4 ohms even if the PSU was up to it.

As you need a new PSU anyway, that is where most of the attention should be focussed. Especially as you can build it such that it will really do 180W into 4 ohms, which will be far more than the Sansui could manage.

peranders · 19th May 2006, 01:47 PM

Quote:

Originally posted by bcrazy
For me the sansui had just enough power for my speakers.

Will the ucd180 bew powerful enough or should i go for the 400?

Think decibels also. You will get 3 dB more out from UcD400, hardly noticable if we only talk about the sound level.

If money is not an issue maybe you should go for UcD400? Both Bruno and Jan-Peter have hinted about the more advanced circuitry of the UcD400.

Tekko · 19th May 2006, 02:31 PM

Bridge four UCD700 modules for stereo

MOER · 20th May 2006, 07:19 AM

The UCD power is soley determined by the power supply

If you put a UCD180 or a 400 on a +/-40v rail, they will deliver the same power!

bcrazy · 20th May 2006, 09:35 AM

Ok

The UCD180 is rated at 105Watts in 4 ohms with a +/-45 supply
How high can i go before i trip the overvoltage supply at 52 V?

I read another post here by MOER and he said 48 volts vould trip the overvoltage.

Hypex says 50 volt is max.
How much power will it give with 50V, provided it's possible to run that high voltage.

Will the sound quality decrease when you exceed 45 volts?

nilsomat · 21st May 2006, 08:31 PM

Quote:

Originally posted by MOER
The UCD power is soley determined by the power supply

If you put a UCD180 or a 400 on a +/-40v rail, they will deliver the same power!

Is this evidence based or just a guess??
Would there be any disadvantages doing this?

19th May 2006, 12:58 PM	#1
bcrazy diyAudio Member Join Date: Oct 2005	ucd180 enough power? My sansui au-x701 just blew up it's power supply. I may decide on building a new amplifier with 2xucd180 or 2xucd400. The question is do i need the power of the ucd400. The sansui was 2x100w at 8 ohm, and had very good bass control. I also uprated the power supply condensors from 2x15.000uF to 2x75.000uF. For me the sansui had just enough power for my speakers. Will the ucd180 bew powerful enough or should i go for the 400?

19th May 2006, 01:39 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Well your Sansui was 100W into 8 ohms, the UcD180 is 180W into 4 ohms so potentially could be as low as 90W into 8 ohms. I doubt you will notice any difference. The Sansui is probably a bit over rated anyway, and I very much doubt it can do 180W into 4 ohms even if the PSU was up to it. As you need a new PSU anyway, that is where most of the attention should be focussed. Especially as you can build it such that it will really do 180W into 4 ohms, which will be far more than the Sansui could manage. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

20th May 2006, 07:19 AM	#5
MOER diyAudio Member Join Date: Aug 2003 Location: SIMI VALLEY CA	ucd The UCD power is soley determined by the power supply If you put a UCD180 or a 400 on a +/-40v rail, they will deliver the same power!

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19th May 2006, 02:31 PM	#4
Tekko diyAudio Member Join Date: Jan 2005	Bridge four UCD700 modules for stereo

20th May 2006, 09:35 AM	#6
bcrazy diyAudio Member Join Date: Oct 2005	Ok The UCD180 is rated at 105Watts in 4 ohms with a +/-45 supply How high can i go before i trip the overvoltage supply at 52 V? I read another post here by MOER and he said 48 volts vould trip the overvoltage. Hypex says 50 volt is max. How much power will it give with 50V, provided it's possible to run that high voltage. Will the sound quality decrease when you exceed 45 volts?

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