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Buckeye Amps: 2nd Generation Purifi EIGENTAKT 1ET9040BA Amplifier
- Thread starter Buckeye Amps
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restorer-john
Grand Contributor
The SINAD (THD+N) in both those AP plots is set by the noise component.
Plots of the THD alone (no noise) will show the large difference between the analyzers.
I would expect Dylan (@Buckeye Amps) will be following AP's guidance on locating the source of the issue. If it is indeed the "high performance" analogue sine generator at fault, I would expect AP to look into it and rectify as that is arguably the jewel in the APX555B's crown and something AP is proud to tell the world how good it is.
H2 issues can also come from balanced outputs and inputs- simply changing to SE on my QA403 analyzer can make the H2 spur disappear completely.
Balanced inputs/outputs:
Single ended inputs/outputs:
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tmtomh
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That's so interesting - what is it about balanced vs unbalanced connections that might make that change in H2?
I would have expected balanced to suppress even harmonics and single-ended to exhibit them worse. Weird. Probably because you're upside down in Australia.
More likely they derive balanced from single-ended so the balanced (differential) signal sides are not as well matched as they should be.
OP
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OP
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I suppose you will need to wait for an Amir review to get the answer you need.
Nice! That's what Bruno wants to achieve.I have the answers I need. My Buckeye 9040's sound.... like nothing. In a good way
Perhaps you can share on diyaudio?I actually debate describing the sound differences in my system vs. my Manley Neo Classics (tube amps) and my long term loan S300 bel canto... but I'd just get yelled at for doing it
Unless you are a bat or a dog!
No
What does this mean to me if I want to use a WiiM Pro Ultra RCA out (rated max 2.1V RMS) as a preamp to a Buckeye Hypex NCx500 2-Channel? Will I have trouble reaching sufficient SPL? Will it still have transparent SNR?
If it helps at all, I have found my amps seem to sound best on low gain (the option to have this externally selectable being one of the reasons I picked a buckeye amp) and in playing my preamp at low gain I can't go above half its volume without the sound being stupidly loud on my 89 sensitivity speakers. I would probably get to volume 6 out of 30 in low gin preamp mode if I select high gain. Note, this is for the 9040 monoblocks
Just a reminder that doubling the amplitude (voltage) is only 6 dB in volume.
OP
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You would still have the low SNR/distortion. You just wouldn't get full power output. Quick math would say about 500w or so into 4ohm.
And another reminder - 500 W to 1000 W is only 3 dB.
It depends greatly on your speakers. If they are low in sensitivity they may not play as loudly with the low gain setting as you might like on occasion.
I have this combination (WiiM Ultra / NCx500 2ch) and love it. As previously stated the SPL level will depend on your speaker, its sensitivity, the listening distance and watts. I ordered mine with the Hypex gain stage enabled (26.8dB). As stated on the Buckeye Amps site it will take 2.4v to hit its peak power at 1kHz (~700w). This amp has a power supply rated at 1200w, thus the 600w per channel rating (4 ohm). With a 2.1v signal and 26.8dB gain would be 45.94v into a 4 ohm load = ~528 watts.
I use these calculators:
Benchmark, "Output Voltage Calculator"
Ohms Law Calculator
Crown Audio "Amplifier Power Required"
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@Buckeye Amps ... your 9040 based amp has a frequency response of 50kHz, yet one of the things Bruno said about what's new is the improved response up to 80kHz, per the datasheet. Does your buffer board have a role in this overall reduction? What is the FR of the standalone buffer board?
Secondly, have you submitted the 9040 to Amir for review? Sorry if I missed it.
Secondly, have you submitted the 9040 to Amir for review? Sorry if I missed it.
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OP
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Their FR measurement is without a filter (as noted in the datasheet). We did/do our measurements with a filter (AES 17 standard).
At some point we will send one to Amir, yes. But likely not until we get more Micro Audio SMPS' back in stock.
Well, hurry up, my bats are really wanting to hear this amp!
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