UCD400 layout... I screwed up! - diyAudio
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Old 7th April 2005, 02:42 AM   #1
taloyd is offline taloyd  United States
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Unhappy UCD400 layout... I screwed up!

hello,

Is this layout too tight? I didn't take enough measurements before I bought the enclosure... and I hate to have to buy another one. Let me know if this is alright... This is for a monoblock UCD400 driving a very linear 8ohm speaker...

I fear I completely messed up on this one...

(I'm only showing the big pieces, obviously it needs input/output jacks, bridge rectifier, etc.)

thanks,

-tal
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Old 7th April 2005, 03:45 AM   #2
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mmmhhh...

You can win some cm by installing you UcD module and caps vertical. If this is not enough you can use a separate power supply: I mean putting the toroid + sofstart on a different box.

May be it is wiser to think about a bigger box...

(hey! don't trust me, I'm a beginner )


Good luck
Mauricio
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Old 7th April 2005, 07:09 PM   #3
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Don't skimp on parts. You're already saving a bunch by doing your own labor.

Sell it. And build or buy a nice case like the Series 10, 12 or 20 from http://www.par-metal.com/
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Old 7th April 2005, 07:28 PM   #4
taloyd is offline taloyd  United States
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Default alternative...3 boxes?

hello,

How about splitting the two monoblock amplifiers into three pieces, like maxlorenz recommends?

The power supply box will have:
the two toroidal transformers
the switch
Neutrik 4-pole Speakon speaker connectors to deliver the power to each

Amplifier box which will have:

the UCD400
the rectifier
the filter capacitors
the speaker output jack
the balanced XLR input jack

How's this?

thanks again,

-tal
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Old 8th April 2005, 12:50 AM   #5
taloyd is offline taloyd  United States
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Default ACK!

hello,

Okay, it comes down to this:

Should I send nothing more than the transformer output to the amplifier boxes, and then rectify and filter in the same box as the UCD400, or should I have the bridge rectifiers and the filter caps in the transformer box, and send clean rectified filtered DC to the UCD400 box?

thanks again,

-tal
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Old 8th April 2005, 04:27 AM   #6
ghemink is offline ghemink  Netherlands
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Default Re: ACK!

Quote:
Originally posted by taloyd
hello,

Okay, it comes down to this:

Should I send nothing more than the transformer output to the amplifier boxes, and then rectify and filter in the same box as the UCD400, or should I have the bridge rectifiers and the filter caps in the transformer box, and send clean rectified filtered DC to the UCD400 box?

thanks again,

-tal

I love your footnote (the thing about Goering), you should send it to some of the current worldrulers.

Gertjan
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Old 8th April 2005, 05:58 PM   #7
taloyd is offline taloyd  United States
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Default new approach!!!

hello,

I decided to just make every one-channel box, a two-channel.

Since I'm actively bi-amping the entire system anyway, I can get rid of my other amp (if the UCD400 performs as well as a Crown K2...) and run only low-level input and the transformer output all the way to the amplifiers, then rectify and filter the power, and plug directly into the speaker only a foot away, as the amplifier will be bolted to the speaker enclosure.

So, I'm going to buy a 1000VA transformer, two more UCD400s, and have an even better system!

cheers,

-tal

ps: the Crown K2 is awesome...
http://www.crownaudio.com/amp_htm/kspecs.htm
Professionally built class-D, limitless power, amazing damping factor, bulletproof... I'm actually really happy with it...
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Old 8th April 2005, 06:07 PM   #8
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You will need thick cable for your psu runs. Low voltage and dc- that's a killer for voltage drop and cable heating. Look at at least 4mm squared for your conductor diameter, and keep runs as short as possible.
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Old 9th April 2005, 12:38 AM   #9
taloyd is offline taloyd  United States
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Default what about AC?

hello,

What if I mount the bridge rectifiers/filter caps in the amp box, and so the only thing coming into the amp box is the transformer output?

Then it'd be +/- 40VAC going to the rectifiers in the box. Would that help the power transmission issue?

thanks,

-tal

ps: I've rethought the transformers too. I talked to Avel Lindberg and they said they'd give me a full refund since the transformers are unused. So I think I'll get two 1000VA 40-0-40 transformers, one for the left two channels, and one for the right two channels. Or should I set it up so it's one for the woofer, and one for the full-range driver (Manger!), like a traditional stereo amp?
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Old 9th April 2005, 02:27 AM   #10
Mark Kravchenko
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Default Better to send DC than to send AC

Think about this. Chopping AC to DC pulses gives off Radio Frequency pulses. Noise. You can and should tone this down with snubbing capacitors. But in the interest of good sound do the AC to DC in the transformer boxes and send the DC via big *** cables as sugested. You will be much happier in the long run.

Mark
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