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  1. #1

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    Default Class D Amp for 2 channel with SDA's

    I know this is probably blasphemy, A lot of power for a lot less money. I'm kinda looking at these two

    220W RMS Per Channel into 8 ohms, 440W RMS Per Channel into 4 Ohms.

    Class D Audio SDS 440CS

    or with balanced inputs and gain controls for $35 more

    Class D Audio SDS 440C

    You can also get the SDS 440C in a complete kit form for $100.00 less.

    Class D Audio SDS 440C Kit

    Most the reviews seem positive but I've also read that do to the fast switching nature of class d amps that they can get fatiguing after awhile.

    Any one with experience / options (good or bad are welcome) or should I lay off the drugs and forget the whole Idea?
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  2. #2

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    The only way you are going to know for sure is with your own ears. So buy one, forget about everything you've read or heard from others, listen with an open mind and decide for yourself.
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    I love my wyred on everything I've used so far. They have a different sound from my tube amps but I enjoy them more with a lot less heat.
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    I'd spend the $35 more for balanced and gain controls without question, even if you don't need them you'll get it back in resale value. Seems like a nice amp i'd give it a shot, not going to know until you try it out for yourself.
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  5. #5
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    Not my first suggestion for class D...
    A few members have had those amps cutout on heavy load, and I think they sound quality is lacking compared to other designs. ICEpower is a well used design in the HiFi world, and Hypex is a little more exotic, but starting to see more HiFi usage outside of the DIY community. Class D can be excellent if implemented well, and power supply is a big factor in that like a traditional amp.

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    Met a guy at the Lone Star Audio Fest that runs the Hypex with his Focal Grande's during the summer and his big tube amps in the winter and has been pretty happy.

    Hypex ENCOR 400
    http://www.hypex.nl/technology/ncore.html

    http://www.audiocircle.com/index.php?topic=110782.0

    http://www.siliconray.com/re2507-nc-...pex-nc400.html
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    I put together a ClassD kit a couple of years ago. Some tube guys were replacing their tube amps with ClassD. I bought a kit and made my own case. Just wasn't my thing. I passed it around to anyone who wanted to try it and only one guy thought it was OK but he went out and bought a Bryston. Guess he wasn't so impressed after all. LOL Finally put it up for sale and it sold in 4 days. A month later it was back up for SALE. He got caught up in all the hype. He finally settled on a Rogue tube amp.



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  8. #8

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    Just like Class A/B amps, not all class D amps sound the same.

    I would avoid the above mentioned amps for a couple of reasons. I'm unsure if they're common ground or not, also they can sound wildly different depending on the impedance of the speaker used. Wyred 4 Sound, Hypex and Bel Canto are much better examples of Class D, but are also non common ground.
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  9. #9
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    Hypex are common ground, or at least mine is as the modules are grounded together, and I think the same can be done with the ICEpower modules? I also remember Fred mentioning that Hypex are common ground.

  10. #10

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    Here is one amp for consideration:

    http://www.polkaudio.com/forums/show...-Carver-TFM-55
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  11. #11

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    Jake, the only models I'm familiar with from them are common ground, thanks for the correction.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

  12. #12

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    *aren't...it would be nice to have the ability to edit after a few minutes.
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  13. #13

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    Quote Originally Posted by cfrizz View Post
    The only way you are going to know for sure is with your own ears. So buy one, forget about everything you've read or heard from others, listen with an open mind and decide for yourself.
    Ditto with you here Cathy, while reading reviews both pro & consumer to give you an idea of how an item performs has it's merits, it's not until you have the gear set up in your system where you can make a valid & trustworthy decision. Read all you want but get your ears on it. Class D done right is an awesome performer.
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  14. #14

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    Just my 2 cents....I tried a Class D in my truck for the subwoofer...NEVER again....give me my power sucking Class A, lacked a lot of the shall we say...BOOM ? :)
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    Usually class-D amps are very good at subwoofers, but not all amps are created equal as well.

  16. #16
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    Sexy Hypex class-D with balanced power supply :D

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    Quote Originally Posted by zingo View Post
    ... Hypex are common ground.
    Yes the UcD modules are common ground.Any ICE modules with which I am familiar are not common ground.

  18. #18
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    Do you know if the ICEpower modules can be strapped Fred in a custom amp?

  19. #19

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    Quote Originally Posted by zingo View Post
    Do you know if the ICEpower modules can be strapped Fred in a custom amp?
    Not with any of the ASP series.

  20. #20
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    Interesting... So I would then presume that an amp like the W4S ST-1000 would not be compatible with SDAs.

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    Quote Originally Posted by zingo View Post
    Interesting... So I would then presume that an amp like the W4S ST-1000 would not be compatible with SDAs.
    Correct IIRC it is based on the 1000ASP module.You would need to add an isolation transformer to isolate the negative output terminals from each other.

  22. #22
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    When this thread started I float the common ground question to B&O, so we'll see what technical explanation they come back with.

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    The reason being is that the negative output terminal is not tied to ground.It is the exact inverse of the signal at the positive terminal(same level,opposite phase ie. bridged) so strapping the negative terminals would effectivly be the same as shorting between the two positive terminals.
    Last edited by FTGV; 10-03-2013 at 03:46 PM.

  24. #24

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    Quote Originally Posted by FTGV View Post
    so strapping the negative terminals would effectivly be the same as shorting between the two positive terminals.
    This shorting can be a bad thing sometimes, eh? ;)

    Back in 2006 my opinion of ICEPower changed to favorable when I heard Eight 1000 watt Acoustic Reality eAR ICEPower amps powering a pair of Magico Reference speakers.
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  25. #25
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    So it sounds like Hypex is still a better option for class-D SDAs... I think I need to get my hands on a Crown XLS2500 to test as it has good specs, and that technology (DriveCore) is also currently being used by Lexicon among other Harman brands. If that in-house designed with Ti, class-D chip set is being used in their high end consumer and professional lines, it must be decent; especially at 775wpc.

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    Quote Originally Posted by SCompRacer View Post
    This shorting can be a bad thing sometimes, eh? ;)

    Back in 2006 my opinion of ICEPower changed to favorable when I heard Eight 1000 watt Acoustic Reality eAR ICEPower amps powering a pair of Magico Reference speakers.
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    Quote Originally Posted by SCompRacer View Post
    This shorting can be a bad thing sometimes, eh? ;)
    As Elmer Fudd would say "verwee verwee bwad".
    Back in 2006 my opinion of ICEPower changed to favorable when I heard Eight 1000 watt Acoustic Reality eAR ICEPower amps powering a pair of Magico Reference speakers.
    Nice little "budget" system.

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    http://seattle.craigslist.org/sno/ele/4061352589.html

    This looked similar to a pic posted in this thread...kinda caught my eye.
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  29. #29
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    Below was the response from B&O, which matches what Fred posted above:

    "After discussing with my support engineer, the ASP series have Vo+ and Vo- as a speaker output. However, this Vo- is not a ground. Both Vo+ and Vo- are “hot”, which means they are connected to the balanced amplifier output. Therefore, Vo- outputs on two ASP modules cannot be strapped together.

    For your information, related description is shown in “Output Stage” section in page 19 (250ASP and 500ASP) or page 20 (1000ASP) of the datasheet available on the website."

  30. #30
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