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Here you see some benchmarks of our products:[05/20/04] The benchmarks of SuperDual V1Q: driving 27 and 300 ohm loads. All the tested specs get the highest RMAA rank - "Excellent". [04/11/04] The benchmarks of SuperDual Release Candidate 3: driving 27 and 300 ohm loads. [04/03/04] The benchmarks of SuperDual Release Candidate 2: driving 27 and 300 ohm loads. As you can see, this new version drives both low and high impedance headphones extremely well with extremely low noise, distortions and channel crosstalk. [03/28/04] The benchmarks of SuperMini V7.0 Rev.B: driving 27 and 300 ohm loads. Again, the crosstalk rising at high frequency is caused by the cable. [03/11/04] Measured bass boost effect for SuperDual RC1 with bass boost switch. [03/08/04] The following tests are done with E-MU 1212M audio card with two 3-ft cables: Direct loopback with a coupler (without amp) SuperDual RC1 driving 300 ohm load at max volume SuperDual RC1 driving 27 ohm load at max volume Notice that the crosstalk rising at high frequency is caused by the cable as it is there even without the amp. [03/03/04]The benchmarks of the release candidate 1 of SuperDual: 300 ohm load: tested at 16bit/44.1kHz, 24bit/44.1kHz 27 ohm load: tested at 16bit/44.1kHz, 24bit/44.1kHz Again, the channel balance offset is from the audio card, not from the amp, see the first graphs of the audio card: 16/44 and 24/44. [03/02/04] The following tests are done with RightMark 5.3 and M-Audio Transit USB audio adapter. The volume of the amp is set to the maximum; this is the worst case - real life listening will be much better. SuperDual (prototype) driving 300 ohm load, 16/44, 24/44 SuperDual (prototype) driving 27 ohm load, 16/44, 24/44 M-Audio Transit USB direct loop back, 16/44, 24/44 Note that the channel balance offset is caused by the Transit, not from the amp. The drop at low frequency will not exist in the final products. As you see the amp does not raise noise level at all, even at the maximum volume, i.e., after 11x amplification and driving heavy loads! What does this mean to you? - you'll not hear any hiss from the amp no matter what headphones you use and how loud you listen. The channel separation is excellent; like the super low noise level, such low channel crosstalk is hard to find. I'm still improving the amp and you'll see even better specs later, but for what it is now, this amp is already unbelievable! [02/26/04] The following tests are done with RightMark 5.3 and EMU 1212M: SuperDual (prototype) drving 300 and 27 ohm loads, at maximum volume. Note that the ripples are introduced by the cable, not by the amp. With very short cable, the EMU 1212M is very clean: EMU 1212M with very short loopback cable. I'll make a better cable and post some more accurate data. [02/16/04] The following tests are done with RightMark 5.3 and Echo MIA MIDI: SuperDual (prototype), SuperMicro (V7) and SuperMini (V7), driving 300 ohm load. SuperDual (prototype) driving 27 ohm and 300 ohm loads. SuperDual (prototype) drving 27 ohm and 300 ohm loads, at maximum volume. |
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Xin Feng Company
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