Class D SDS-254 Break In Period?

kregg007 · 22nd May 2011, 02:11 PM

Hi everyone! I searched the forums and could not find one that addressed break in times for SDS-254?!?

I purchased mine about a week ago and it really doesn't sound that great with about 75 hours on it.

I am running a Dodd Buffer and both amp and buffer are "off the grid"

Any feed back would be apreciated.

nigelwright7557 · 22nd May 2011, 04:59 PM

I am not convinced a class d breaks in.
This is because it is just PWM which is hard switched.

kregg007 · 22nd May 2011, 05:06 PM

Hmmm???? Then I don't know if I'm that impressed with what I'm hearing right now.

nigelwright7557 · 22nd May 2011, 05:27 PM

Quote:

Originally Posted by kregg007

Hmmm???? Then I don't know if I'm that impressed with what I'm hearing right now.

Might be worth doing a sweep with a signal generator and scope see what the response is like.

I am very happy with my class d amplifier.

luka · 23rd May 2011, 05:28 AM

I would say your ears need to break in LOL
also depends on amp, maybe is no good one, I don't know it

HiroPro · 10:02 PM

kregg007 what PSU solution are you using? PSU can have a PROFOUND affect on an amplifier especially if it can provide the needed current.

HiroPro · 10:18 PM

The only negative reviews I've heard involved people trying to use the amps with PSUs and speakers the unit can hardly drive. For example a guy was on here complaining about CDA-224 not driving his Magnepan 3.7 Also he used his own PSU with capacitance less than the PSU option shipped with CDA-224

This is hardly an accurate representation of what the amp offers... but the gentleman simply assumed the classdaudio amps have poor SQ... foolish assumption...

Single ended or double? If single is your jumper set inverted on non? Perhaps you have the input wired incorrectly and/or gain pot set poorly. What speakers are you drying to drive with it?

The SDS-254 requires +/- 40 Volts DC to +/- 50 Volts DC Is this what your DC-DC battery PSU is providing?

I'd drive to power the module with a decent caliber SMPS over a battery setup.

bigdh31 · 25th May 2011, 07:01 PM

I ordered the SDS-254 kit which included a linear power supply. It sounded good when I first turned it on. I do not think it has changed much over time.

22nd May 2011, 02:11 PM	#1
kregg007 diyAudio Member Join Date: Nov 2010 Location: Dallas, TX	Class D SDS-254 Break In Period? Hi everyone! I searched the forums and could not find one that addressed break in times for SDS-254?!? I purchased mine about a week ago and it really doesn't sound that great with about 75 hours on it. I am running a Dodd Buffer and both amp and buffer are "off the grid" Any feed back would be apreciated.

22nd May 2011, 04:59 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I am not convinced a class d breaks in. This is because it is just PWM which is hard switched. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

23rd May 2011, 05:28 AM	#5
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	I would say your ears need to break in LOL also depends on amp, maybe is no good one, I don't know it __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

23rd May 2011, 09:59 PM	#6
HiroPro diyAudio Member Join Date: Nov 2009	kregg007 what PSU solution are you using? PSU can have a PROFOUND affect on an amplifier especially if it can provide the needed current. Last edited by HiroPro; 23rd May 2011 at 10:02 PM.

23rd May 2011, 10:08 PM	#7
HiroPro diyAudio Member Join Date: Nov 2009	The only negative reviews I've heard involved people trying to use the amps with PSUs and speakers the unit can hardly drive. For example a guy was on here complaining about CDA-224 not driving his Magnepan 3.7 Also he used his own PSU with capacitance less than the PSU option shipped with CDA-224 This is hardly an accurate representation of what the amp offers... but the gentleman simply assumed the classdaudio amps have poor SQ... foolish assumption... Single ended or double? If single is your jumper set inverted on non? Perhaps you have the input wired incorrectly and/or gain pot set poorly. What speakers are you drying to drive with it? The SDS-254 requires +/- 40 Volts DC to +/- 50 Volts DC Is this what your DC-DC battery PSU is providing? I'd drive to power the module with a decent caliber SMPS over a battery setup. Last edited by HiroPro; 23rd May 2011 at 10:18 PM.


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22nd May 2011, 05:06 PM	#3
kregg007 diyAudio Member Join Date: Nov 2010 Location: Dallas, TX	Hmmm???? Then I don't know if I'm that impressed with what I'm hearing right now.

25th May 2011, 07:01 PM	#8
bigdh31 diyAudio Member Join Date: Feb 2007 Location: Powell. TN	I ordered the SDS-254 kit which included a linear power supply. It sounded good when I first turned it on. I do not think it has changed much over time.

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