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Old 19th March 2009, 02:46 PM   #1
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Default Getting the best out of Hypex UCD

I have read a few posts about the hypex UCD series of amps.
A lot of people talk of the need to "properly implement" the modules and bypass the input buffer.
I am looking to use a few of the UCD180's in a computer controlled crossover/active speaker system.
I am not well versed in electrical engineering, but i was wondering if anyone could explain just how you would go about properly implementing the UCD modules beyond simply hooking them up between a power supply and a driver?
Thanks,
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Old 20th March 2009, 04:28 AM   #2
glt is offline glt  United States
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If you get the latest HG series and buy an Hypex PS, you just hook them up. The only "filter" is an input capacitor to block DC voltage in the input pins. The only other enhancement is the HxR regulators for the input op-amps to provide extra clean power. you can buy the modules with or without the HxR regulators.
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Old 21st March 2009, 08:49 AM   #3
Koifarm is offline Koifarm  Netherlands
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If your activefilter can supply between 4.5 and 9 Vrms output, then you can bypass the pre/opamp stage of the UCD and you do not need HXR. You can just use the ST version. Look below:

Hybrid Hypex UCD

First picture shows bypassing the opamp. Look where/how the white and red cable are connected.
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Old 21st March 2009, 09:07 AM   #4
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Thanks for the responses.
With the setup your describing Koifarm, would you say the performance is superior to the HG/HXR amp, or is it just an interesting option?
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Old 21st March 2009, 05:57 PM   #5
Koifarm is offline Koifarm  Netherlands
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I like the hypex ST without the opampstage the most.

HxR is useless if you do not use the opamp
The HG version has other output/buffer capacitors the difference was for me not noticeble.

About the powersupply, i use the redrocks smps. For 130,- you got a 1000watt( 2000Watt max) perfect powersupply.

I use 2 x UCD180 and 2 x UCD400 on one redrocks SMPS.http://www.redrocksaudio.es/e_main.html
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Old 24th March 2009, 06:26 AM   #6
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Thanks greatly for your advice Koifarm. I think i will try that approach.
Do you happen to know of any websites that detail for a layman how to bypass the opamp stage on the UCD?


Just put in an order for 2 of the redrocks SMPS's. they look like an ideal solution.
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Old 24th March 2009, 04:20 PM   #7
Koifarm is offline Koifarm  Netherlands
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In a early reply i send a link where you can see how to bypass the opamp.

If this is not clear enough, send a picture of the ucd's you gonna use and i point you out what to do.
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Old 24th March 2009, 10:33 PM   #8
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Ahh yes, i forgot about you earlier reply.
Thats a great help, thanks again.
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Old 25th March 2009, 10:21 AM   #9
thedawg is offline thedawg  United States
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Greetings Koifarm,

"The HG version has other output/buffer capacitors the difference was for me not noticeble."

You show optimal implementation through the simple tube.

Your highest preference, assumes sonically, is the cheapest, earlier ST version, only without a

proper input stage for it but simple tube.

If you can't also hear the difference between the different quality modules, is that as true

before as it is after such optimizing with simple tube? Most others seem to have ease hearing

difference already, but not just from the parts you remove, also those that remain. Is your

optimization so good they can't be heard right anymore?

Is it so superior to proper High Grade module that the flavour of the components themselves is

erased? Do you think erasure or, overpowered is more likely, and if overpowered, what by?

Maybe Hypex just take people for funny with High Grade and it no better? That would be bad.

Your wiring, so neat and appealing to the eye, is this also what good signal integrity? Have you

looked for signal integrity for optimize or just simple tube?

I feeling GLT advice here closer to absolute and simpler too. Most of what people recommend

is the improved I see is HG module, where input coupling caps are bypassed, and input stage

intact. Others seem to have big improvement with basics in signal integrity. But maybe hearing

the components is less good than noises held in high regard?

When we hear things others don't, or don't hear things others do, it's often not because our

ears are different. Maybe I like tube too, but I really like LM4562, this is good sound I build for

friends. I hope you hear too.
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Old 25th March 2009, 11:04 AM   #10
Koifarm is offline Koifarm  Netherlands
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Dear Thedawg,

First -there is a sonic difference between the ST and HG version. But after bypassing the opamp buffer the difference is too small to notice. So when you want to bypass the opamp buffer you just can buy the ST version.

Second -i do not tell which is better because i think in terms of difference. In a other thread i described why i used tube buffer stages whit the UCD modules.

Third -a lot of statements i make are results of ABX testing with a lot of people here in the Netherlands and Germany. We do that almost weekly whit a great variety of audio equipment.

I think also " less is more", the less parts in the analoge path the better. Therefore i have after the CD DAC IC just 1 I/V resistor, 1 tube, 1 output capacitor, straight to UCD without opampbuffer or to my 813 tube amp.

I like that you find your way to the sound you like. This is very important to know what you like and not let tell others what is good.

I like to get shivers from the hights and punches from the kickbass and a warm feeling from female singers.
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