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  • #16
    Class D amps are great choice for a subwoofer or woofer applications... But I would be careful using either of the mentioned amps for full range, midrange, or tweeter duty for HIGH resolution systems. For lower capable systems great for low heat and weight.

    As is typical, and most other class D amps I have seen, have quite high harmonic distortion peaks above 2KHz. The TPA3255 had as high as 0.5% is some usage cases around 5KHz. The ice power amps actually do have 6.66KHz distortion listed, and can be seen to be much higher than the 1KHz rating. Typically amps are rated at 1KHz for distortion, and that makes class D amps seem better than they actually are.

    The second problem with class D is the passive output filter. You typically get a significant rising response to 20KHz. Peaks of 3-4 dB unless the speaker impedance is just right.

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    • #17
      Originally posted by scottmc View Post
      Class D amps are great choice for a subwoofer or woofer applications... But I would be careful using either of the mentioned amps for full range, midrange, or tweeter duty for HIGH resolution systems. For lower capable systems great for low heat and weight.

      As is typical, and most other class D amps I have seen, have quite high harmonic distortion peaks above 2KHz. The TPA3255 had as high as 0.5% is some usage cases around 5KHz. The ice power amps actually do have 6.66KHz distortion listed, and can be seen to be much higher than the 1KHz rating. Typically amps are rated at 1KHz for distortion, and that makes class D amps seem better than they actually are.

      The second problem with class D is the passive output filter. You typically get a significant rising response to 20KHz. Peaks of 3-4 dB unless the speaker impedance is just right.
      The TPA are perfect for high resolution systems. That is what they are *made* for. I've listened to plenty of Class D over the years and these are some of the best around aside from the top tier Icepower and Ncore. Not going to defend by proxy when there are countless posts by far, far more knowledgeable people out there about these amps. They are hugely popular and there's a ton of user feedback. To say these should only be used for woofers is strange and flat out wrong.



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      • #18
        [QUOTE=skatz;n1379268]
        Originally posted by Wushuliu View Post

        Below is the direct link to the TPA3255 315W (8ohm) at TI. There's also the 3251 (2-4ohm). They have a coupon code that gets you the amp at 50% off.
        Where do you find this code? Must you be registered for it?
        You can learn more about the promotion here:

        http://www.diyaudio.com/forums/class...promotion.html

        If you want to dive into the technical deets, you can go here:

        http://www.diyaudio.com/forums/class...gn-etc-51.html





        Quote: Originally Posted by Yatsushiro Received an email from TI this morning announcing another half price promotion on a range of EVM boards; TPA325

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        • #19
          Just ordered the TPA3255. That is a good deal.
          I'm looking for a good power supply. How would the buyout work vs the Mean Well?

          https://www.parts-express.com/qualte...utput--129-148

          https://www.parts-express.com/mean-w...pply--320-3169

          I had also considered building a linear power supply but others have reported they are not ideal.

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          • #20
            Originally posted by kenrhodes View Post
            Just ordered the TPA3255. That is a good deal.
            I'm looking for a good power supply. How would the buyout work vs the Mean Well?

            https://www.parts-express.com/qualte...utput--129-148

            https://www.parts-express.com/mean-w...pply--320-3169

            I had also considered building a linear power supply but others have reported they are not ideal.
            It really depends on your application. I'd go with the 48 V Meanwell for 8 ohm speakers, perhaps the buyout for 4 ohms. But if you have monster 4 ohms that can take 300 W, you'll need a 48 V supply @ 12+ amps.

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            • #21
              Thanks. I'll go for the bigger of the two I linked. Going for the full 48v 12A power supply increases the cost a lot.

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              • #22
                Don't know of their quality, but there are some lesser priced smps on that bay site.
                http://techtalk.parts-express.com/fo...khanspires-but
                http://techtalk.parts-express.com/fo...pico-neo-build
                http://techtalk.parts-express.com/fo...ensation-build

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                • #23
                  The prices aren't low enough to make me want to risk it on a $75/$150 board. I would rather have less output than dirty/possibly unsafe output. I have seen the aftermath of power supplies that have failed and sent over-current down the lines.

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                  • #24
                    Originally posted by kenrhodes View Post
                    Just ordered the TPA3255. That is a good deal.
                    I'm looking for a good power supply. How would the buyout work vs the Mean Well?

                    https://www.parts-express.com/qualte...utput--129-148

                    https://www.parts-express.com/mean-w...pply--320-3169

                    I had also considered building a linear power supply but others have reported they are not ideal.
                    Have you had time to get this up and running?

                    Any issues with needing 4+ volts to drive them to full power?

                    How do they sound?
                    http://techtalk.parts-express.com/fo...khanspires-but
                    http://techtalk.parts-express.com/fo...pico-neo-build
                    http://techtalk.parts-express.com/fo...ensation-build

                    Comment


                    • #25
                      Sorry, not yet. I also doubt that I will ever push it to its limits, I rarely listen at elevated levels.

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                      • #26
                        Anyone with experience and opinions regarding ETAL Anaview AMS class D amplifier modules?
                        See link below.



                        Our premium and newest line of amplifier modules is based on our patented AMS architecture where nonlinearities are corrected in parallell with the class d stage itself. The technology offers wide 1st order bandwidths and 0.05% THD+N at rated power – and a truly first class listening experience. Each AMS amplifier is loaded with professional grade features such as clip indications per-channel and temperature readouts of the hottest component.
                        "Our Nation’s interests are best served by fostering a peaceful global system comprised
                        of interdependent networks of trade, finance, information, law, people and governance."
                        - from the October 2007 U.S. Naval capstone doctrine
                        A Cooperative Strategy for 21st Century Seapower
                        (a lofty notion since removed in the March 2015 revision)

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                        • #27
                          Originally posted by JRT View Post
                          Anyone with experience and opinions regarding ETAL Anaview AMS class D amplifier modules?
                          See link below.


                          No, but TI's TPA3255 chip offers similar (if not better) distortion spec.'s.

                          Comment


                          • #28
                            Originally posted by JRT View Post
                            Anyone with experience and opinions regarding ETAL Anaview AMS class D amplifier modules?
                            See link below.


                            IIRC, those have been out for quite some time. Maybe it was diyaudio that had a thread or two about them.
                            http://techtalk.parts-express.com/fo...khanspires-but
                            http://techtalk.parts-express.com/fo...pico-neo-build
                            http://techtalk.parts-express.com/fo...ensation-build

                            Comment

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