New Purifi amplifiers coming

[EdW]

Not even close. The APX555 or 555B has another 15-20dB to play with. Ask @amirm

But, that's only at a measly 5W. One data point at 1kHz 5W is just that, one data point.

I didn’t realize that the AP555 was good for 150dB dynamic range. I agree we need to see a full set of power vs distortion sweeps at different frequencies into 8/4/2 Ohm loads. Along with multitone and IMD plots.

 

[Buckeye Amps]

I wanted to close the topic that was discussed a while back re: certification of the 2kW Micro Audio SMPS'

Micro Audio 2kW SMPS Certification

I also have a copy of the full certificate on file.

 

[soerenssen]

OPA1656 as per the man himself.

Apollon NCx500ST Stereo Amplifier Review

With that responsiveness cherry on top - this is certainly my way to go forward. Just looking for a DAC+preamp that has a configurable sub out and dirac that matches well with this now. You'll be wanting a miniDSP flex then :D

www.audiosciencereview.com

I just noticed the following update on the product page: "One Texas Instrument OPA1656IDR OPA per channel is used."

 

[Rick Sykora]

Big scoop here! The OP is almost 2 years old and still no modules available for hobbyists.

 

[Matias]

Big scoop here! The OP is almost 2 years old and still no modules available for hobbyists.

It would be embarrassing if the competition released theirs earlier.

Hypex NCx1000 OEM

Source https://www.hypex.nl/media/d7/10/18/1706517635/Hypex_OEM-brochure_v1.1_min.pdf

www.audiosciencereview.com

 

[Rick Sykora]

It would be embarrassing if the competition released theirs earlier.

Hypex NCx1000 OEM

Source https://www.hypex.nl/media/d7/10/18/1706517635/Hypex_OEM-brochure_v1.1_min.pdf

www.audiosciencereview.com

pic from the NCx1000 release announcement…

 

[BassMojo]

Any idea what the 9040 (and/or NCx1000) RMS rating might be? I see the peak for the 9040 is 750w, but am curious as to RMS. The reason for asking is to shoot for an amp with will maximize my Perlisten speakers which are rated at 600w RMS. I assume that they will sound identical. Thanks.

 

[Rick Sykora]

Any idea what the 9040 (and/or NCx1000) RMS rating might be? I see the peak for the 9040 is 750w, but am curious as to RMS. The reason for asking is to shoot for an amp with will maximize my Perlisten speakers which are rated at 600w RMS. I assume that they will sound identical. Thanks.

Not really clear what the Perlisten spec is but like other recommended power ones, it is pretty useless. Might be useful if they stated that maximum amp power handling is 600 watts, but without any other stated conditions, cannot tell. Agree most of the range of power required for speakers is dynamic and you are not likely to hear any difference. A bit more power will do no harm and only likely to your hearing before any equipment problems occur. Otoh, if you are on a budget, why waste money on power you do not need....

How close to your speakers do you listen and how sensitive are they?

 

[Ordin Aryguy]

Any idea what the 9040 (and/or NCx1000) RMS rating might be? I see the peak for the 9040 is 750w, but am curious as to RMS. The reason for asking is to shoot for an amp with will maximize my Perlisten speakers which are rated at 600w RMS. I assume that they will sound identical. Thanks.

It's not stated which Perlisten speakers you have, but they all seem to have reasonable sensitivity spec's. The S7t's are rated at 92.2dB @ 1W. That's pretty darned sensitive.

Here's a quick chart showing the SPL of a 92.2dB @ 1W speakers at power levels from 1W to 600W... It only takes 6W to hit 100dB!

If I had to guess, your speakers will never see 600W. I certainly won't try to talk you out of buying a mega-amp if you really want it, but it's sort of like owning a Ferrari and never getting out of 1st gear.

 

[pogo]

It only takes 6W to hit 100dB!

This is correct for the test stimuli. But we also hear music below 100Hz, for example

 

[Ordin Aryguy]

This is correct for the test stimuli. But we also hear music below 100Hz, for example

How many dB reduction below the test frequency should we consider? I still contend that 600W will be painfully, dangerously loud, even into low efficiency speakers.

edit: corrected wonky spelling

 

[pogo]

It also depends on the program material and the impedance curve.
Here you can even have a normal conversation at over 600W:

 

[im_gumby]

Coming from Purifi and Bruno, I expect nothing but excellence in other important metrics such as IMD and reliability of the module. So it comes down to PS choice, buffer and opamp, and general assembly quality and chassis design to differentiate between other amps based on this marvel module.

Ok, I could have sworn that I saw a YouTube video where Bruno was being interviewed and he talked about changing out the opAmp?
Sorry if that was already talked about earlier on the thread. Just jumped in late.

 

[BassMojo]

Not really clear what the Perlisten spec is but like other recommended power ones, it is pretty useless. Might be useful if they stated that maximum amp power handling is 600 watts, but without any other stated conditions, cannot tell. Agree most of the range of power required for speakers is dynamic and you are not likely to hear any difference. A bit more power will do no harm and only likely to your hearing before any equipment problems occur. Otoh, if you are on a budget, why waste money on power you do not need....

How close to your speakers do you listen and how sensitive are they?

Thank you Rick. The Perlisten S7t's are rated at 92.2 dB and my MLP is 12' from each one.

 

[BassMojo]

It's not stated which Perlisten speakers you have, but they all seem to have reasonable sensitivity spec's. The S7t's are rated at 92.2dB @ 1W. That's pretty darned sensitive.

Here's a quick chart showing the SPL of a 92.2dB @ 1W speakers at power levels from 1W to 600W... It only takes 6W to hit 100dB!

If I had to guess, your speakers will never see 600W. I certainly won't try to talk you out of buying a mega-amp if you really want it, but it's sort of like owning a Ferrari and never getting out of 1st gear.

View attachment 367774

Thank you for your thoughts. The 92.2dB indicated 1w at 1 meter. My MLP is closer to 4 meters.

 

[Rick Sykora]

Thank you Rick. The Perlisten S7t's are rated at 92.2 dB and my MLP is 12' from each one.

You are not likely to need much more than 200 watts, but see the impedance gets rather low and Stereophile recommended amps that can handle 2 ohm loads. The size of your room can also factor into a need for greater power or powered subwoofers.

Given this, if you already have amps that meet the power need, you should be fine.

 

[pogo]

 

[Matias]

Finally online also with eval4 board.

1ET9040BA Amplifier Module

purifi-audio.com

 

[mocenigo]

Yep, I just got an email. Amazing!

 

[Rick Sykora]

Finally online also with eval4 board.

1ET9040BA Amplifier Module

purifi-audio.com

Its progress, but is pricey. Can have the Buckeye monoblock for $1150. Going to struggle with DIYing for that.