$175 Class D amp--120 wpc

justd · « **Reply #3560 on:** 28 Sep 2013, 11:13 am »

i Have two CDA 254s running of a single power supply. One one amp....i have the left and right channels and on the other i just have the centre channel using one channel. Some times during playing music the centre channel goes yellow and stops playing....do i need a separate power supply?

TrungT · « **Reply #3561 on:** 28 Sep 2013, 02:55 pm »

If you bridge the center channel board, the center speaker must be 8 ohms.

srb · « **Reply #3562 on:** 28 Sep 2013, 02:59 pm »

Quote from: TrungT on 28 Sep 2013, 02:55 pm

If you bridge the center channel board, the center speaker must be 8 ohms.

It sounds like justd is using only one of the channels in normal stereo (unbridged) configuration.

Quote from: justd on 28 Sep 2013, 11:13 am

..... on the other i just have the centre channel using one channel.

Steve

TrungT · « **Reply #3563 on:** 28 Sep 2013, 03:23 pm »

Thanks Steve.

May check the voltage to the board when it goes yellow.

justd · « **Reply #3564 on:** 29 Sep 2013, 03:04 am »

Quote from: srb on 28 Sep 2013, 02:59 pm

It sounds like justd is using only one of the channels in normal stereo (unbridged) configuration.

Steve

yes...

any ideas?

matt_garman · « **Reply #3565 on:** 30 Sep 2013, 02:13 pm »

I would send an email to Tom at Class D Audio. He's usually quite helpful. Just don't expect an immediate reply, it's clear to me that he's quite busy!

dragon5589909 · « **Reply #3566 on:** 3 Oct 2013, 08:36 am »

Dear all,

I've just purchased two SDS-470 modules.

I intend to bridge them each and wire them as monoblocks.

I'm planning to replace the gain pots with TX2575 resistors - would anyone know if I still need a pair of resistors per module, or can i just use a single resistor per module, now that I'm bridging them?

Thanks!

Mike

krikor · « **Reply #3567 on:** 3 Oct 2013, 01:05 pm »

Quote from: dragon5589909 on 3 Oct 2013, 08:36 am

Dear all,

I've just purchased two SDS-470 modules.

I intend to bridge them each and wire them as monoblocks.

I'm planning to replace the gain pots with TX2575 resistors - would anyone know if I still need a pair of resistors per module, or can i just use a single resistor per module, now that I'm bridging them?

Thanks!

Mike

No, you don't need the resistors for the other "unused" channel. I've got a pair of SDS-450 boards running as monoblocks and only have a single gain pot attached to each. I keep thinking about replacing them with resistors but I've never got around to that project.

dragon5589909 · « **Reply #3568 on:** 5 Oct 2013, 06:06 pm »

Quote from: krikor on 3 Oct 2013, 01:05 pm

No, you don't need the resistors for the other "unused" channel. I've got a pair of SDS-450 boards running as monoblocks and only have a single gain pot attached to each. I keep thinking about replacing them with resistors but I've never got around to that project.

Very much appreciated Krikor. Just didn't know if the both channels in the output stage were engaged when the modules were bridged.

Glad to have cleared that up.

Thanks!

wushuliu · « **Reply #3569 on:** 8 Oct 2013, 07:43 pm »

FYI, the US warehouse (based in Oregon) of Hifimediy now stocks Connexlectronic SMPS's. No more awkward emails and long shipping times from China. For those who don't know both Hifimediy and Connex are longtime respected diyaudio members. These power supplies come with 10% adjustable range AND an auxiliary power of 10-12v at 500ma for say a preamp. I've mentioned being extremely impressed with the Connex earlier in this thread. So if your power demands fit I highly recommend them, especiallyas they are only 4x4 and weigh nothing compared to the toroid and cap bank that comes stock with CDA amps.

And you guys do know that there are much cheaper versions on Ebay now, right? Not that I'm knocking CDA - the reliability is worth the cost - but for anyone wanting a secondary setup or want to play around there are *many* boards on ebay now.

http://us.hifimediy.com/index.php?route=product/product&path=68&product_id=64

http://www.ebay.com/sch/i.html?_trksid=p2047675.m570.l1313.TR2.TRC1.A0.Xirs2092&_nkw=irs2092&_sacat=0&_from=R40

john dozier · « **Reply #3570 on:** 8 Oct 2013, 07:49 pm »

No one else uses the quality of components that ClassD uses. No one else achieves their sota sound quality either. You get what you pay for and with Tom's product, you get some of the best out there. Nothing to be taken away from the ebay offerings, they are good cheap amps, but hardly even close to sota. Regards

wushuliu · « **Reply #3571 on:** 8 Oct 2013, 07:58 pm »

Quote from: john dozier on 8 Oct 2013, 07:49 pm

No one else uses the quality of components that ClassD uses. No one else achieves their sota sound quality either. You get what you pay for and with Tom's product, you get some of the best out there. Nothing to be taken away from the ebay offerings, they are good cheap amps, but hardly even close to sota. Regards

Actually Connexelectronic would probably beg to differ. He has several IRS2092 as well and they look pretty freakin' good - but Hifimediy doesn't carry those so be prepared for the 30 day shipping time.

http://connexelectronic.com/product_info.php/products_id/145?osCsid=uq1cv8sl85ti6re7evdtc3q3r1

And in what way exactly are Tom's boards SOTA vs. ebay offerings? (just want some clarification).

Furthermore, just so it's clear I'm really promoting the Connex power supplies not looking to argue about the amps -I think we can agree that Tom's power supplies are NOT sota.

srb · « **Reply #3572 on:** 8 Oct 2013, 08:01 pm »

Quote from: john dozier on 8 Oct 2013, 07:49 pm

No one else uses the quality of components that ClassD uses

I'd like some clarification about that statement in particular.

Steve

john dozier · « **Reply #3573 on:** 8 Oct 2013, 08:36 pm »

Tom uses Niobium oxide caps (I think the only manufacturer who does) and a special input IC designed by the head of Jensen transformers. Again, one of the very few manufacturers to use this device and all others are extremely expensive. Regards

wushuliu · « **Reply #3574 on:** 8 Oct 2013, 08:41 pm »

Quote from: john dozier on 8 Oct 2013, 08:36 pm

Tom uses Niobium oxide caps (I think the only manufacturer who does) and a special input IC designed by the head of Jensen transformers. Again, one of the very few manufacturers to use this device and all others are extremely expensive. Regards

For ALL of his amps or just SDS?

john dozier · « **Reply #3575 on:** 8 Oct 2013, 08:53 pm »

I think only the SDS series, but you would have to ask Tom. Regards

wushuliu · « **Reply #3576 on:** 8 Oct 2013, 09:13 pm »

Quote from: john dozier on 8 Oct 2013, 08:53 pm

I think only the SDS series, but you would have to ask Tom. Regards

Right, that's what I remember. That's a $200+ difference between SDS and the ebay amps. Hence my recommending as a secondary or for playing around. Goes without saying any amp off ebay is a risky proposition. No free lunch.

matt_garman · « **Reply #3577 on:** 8 Oct 2013, 09:35 pm »

Quote from: wushuliu on 8 Oct 2013, 09:13 pm

Right, that's what I remember. That's a $200+ difference between SDS and the ebay amps. Hence my recommending as a secondary or for playing around. Goes without saying any amp off ebay is a risky proposition. No free lunch.

And I would add that Tom has always provided excellent, generous, high-quality customer service. I suspect he's a one-man or at least very small shop, and presumably he's super busy. I'd wager that this thread has probably been both a blessing and a curse for him.

john dozier · « **Reply #3578 on:** 8 Oct 2013, 09:38 pm »

Since I know of at least two people (myself included) who have replace mega buck amps with ClassD Audio, needless to say I recommend them highly. Regards

steve k · « **Reply #3579 on:** 8 Oct 2013, 09:44 pm »

I'm still happy with mine but I do think they are very system specific. I've heard my amps in other systems with poorer results than in my system. Something to be said about system synergy.
steve