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#334842 - 01/18/11 06:48 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17741
Loc: NoVA
Oh neat, I didn't realize he included standoffs and mounting screws.
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#334846 - 01/18/11 07:18 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: Ken.C]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10398
Loc: Calgary, Alberta
It is quite the kit, he may have a bunch of sales on his hands if this build works as well as advertised smile
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#334847 - 01/18/11 07:20 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: jakewash]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17741
Loc: NoVA
It would be really cool if he offered a pre-drilled chassis and parts for the pretties.
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#334851 - 01/18/11 07:33 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8268
Loc: Tacoma
I think I might love this company. I was looking at the user manual, and noticed a VERY interesting rendition of the flag printed on the amp board...



So, Steve, a couple questions, if I may.

1. What's the functional difference between buying two of the CDA-245S kits and one of the CDA-2000 kits? They seem to be the same amp boards. Do you expect more power by using two (smaller?) power supplies and two (smaller?) toroids?

2. If you're using two of the CDA-245 in bridged mode, you're basically building two monobocks, right? I know it's a minor detail, but I don't see how you wire the external LED's in bridged mode.
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#334852 - 01/18/11 07:35 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: tomtuttle]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17741
Loc: NoVA
Seems like Steve bought a custom version of the CDA-2000 kit--with the large PS, the 2 CDA-254 boards, and a 1kVA transformer (larger than anything in a kit that I see).


Edited by kcarlile (01/18/11 07:36 PM)
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#334854 - 01/18/11 07:41 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: Ken.C]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1200
Loc: Fishers, Indiana, USA
Originally Posted By: kcarlile
Seems like Steve bought a custom version of the CDA-2000 kit--with the large PS, the 2 CDA-254 boards, and a 1kVA transformer (larger than anything in a kit that I see).


I think that sums it up.
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#334855 - 01/18/11 07:47 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: tomtuttle]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1200
Loc: Fishers, Indiana, USA
Originally Posted By: tomtuttle
So, Steve, a couple questions, if I may.

1. What's the functional difference between buying two of the CDA-245S kits and one of the CDA-2000 kits? They seem to be the same amp boards. Do you expect more power by using two (smaller?) power supplies and two (smaller?) toroids?

2. If you're using two of the CDA-245 in bridged mode, you're basically building two monobocks, right? I know it's a minor detail, but I don't see how you wire the external LED's in bridged mode.


1) The 254S kit has a low profile power supply (smaller caps). I went with the heavy duty power supply. The power supply board will power both amps, and each amp will be bridged. The CDA-254 amp board actually has 2 amps on it, and I'm ordering 2 CDA-254 amps, and will bridge each one.

2) Yes. 2 monoblocks in 1 case with a shared 1000VA toroid. As far as the led's go, I think you just wire the left channel since that is the channel you will use when bridged. Not sure though.
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#334856 - 01/18/11 07:51 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17741
Loc: NoVA
Easy enough to find out on number 2, just look at which LEDs on the board light up, right?
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#334857 - 01/18/11 07:57 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: Ken.C]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8268
Loc: Tacoma
Ah ha! I was apparently not reading carefully enough. Thank you very much for the clarification, Steve.

How come the CDA instead of the SDA or TI amps?
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#334864 - 01/18/11 08:31 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: tomtuttle]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1200
Loc: Fishers, Indiana, USA
The SDS was about $100 an amp more for things I did not need (balanced inputs, input level adjustment, etc.) The TI amps have greater distortion (their full power rating is actually at 10% distortion, vs. <1%), and were not as well received by the group. In reality, a lot of people preferred the sound of the SDS amp compared to the CDA amp, but most said it was not a difference that was worth the prices. Some people said it had "a deeper soundstage" and "presence". I tend to ignore comments by people who make those statements about amps.
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