MMorrill88
Member
- Joined
- Feb 4, 2020
- Messages
- 13
- Likes
- 4
Klipsch Rp8000F and Focal 816v, mostly the Klipsch.
-
WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!
DIY Purifi Amp builds
- Thread starter JimB
- Start date
Try doing it level-matched and without peeking. I'll bet the differences "magically" go away.
This is wrong. Low dynamic range recordings are more likely to produce higher heat levels as they have a higher average power level. The Purifi has no requirement for fans.
Last edited:
They are efficient speakers, didn't know they need the extra power. Good to know.
I'm thinking about Purifi and NC500 too
MMorrill88
Member
- Joined
- Feb 4, 2020
- Messages
- 13
- Likes
- 4
They're both excellent as far as far as I'm concerned. Which is better? Idk like SIY said I'm probably not really hearing anything too different between the two, most of it is in my head.
MMorrill88
Member
- Joined
- Feb 4, 2020
- Messages
- 13
- Likes
- 4
Already had the nords, got them used for a good price a little while ago. I bought the eval 1 as a little hobby to get into, basically since I liked the hypex stuff so much I thought why not try Bruno's new stuff out?
I personal believe extra power/headroom is more noticeable than the further improvement on lower distortion
maty
Major Contributor
If you make the mistake of using small boxes, low sensitivity speakers, high volume and large dynamic range recordings then a forced dissipation will be necessary. That is activated from a threshold.
In normal listening and the usual commercial recordings probably not. But for such badly produced music it is not necessary to spend a lot of money on the stereo, I say.
In normal listening and the usual commercial recordings probably not. But for such badly produced music it is not necessary to spend a lot of money on the stereo, I say.
Wrong. For the reasons I have already pointed out. It's the highly compressed low dynamics recordings that will have a higher average power level and hence produce more heat. You have it backwards Maty.
The Purifi are more efficient, more so than the previous Hypex designs. No one will have issues with heat.
maty
Major Contributor
The problem is... the Hypex SMPS.
Which is also fine. There is no problem.
maty
Major Contributor
They generate a lot of heat so a small box is counterproductive if we want them to provide a few continuous watts. In addition to being very expensive despite using very low price components.
If you listen your Purifi amp with Klipschs, do you hear any hissing noise with your ear close to tweeter (using just the amp without source connected) ?
MMorrill88
Member
- Joined
- Feb 4, 2020
- Messages
- 13
- Likes
- 4
With the Freya in passive mode I hear nothing. But in jfet yes. In tube mode there's a ton a hiss. So no I don't hear anything. Just unplugged the xlr inputs and still no noise.
If I want to wire a front panel "power" switch, can I use amp enable signal for it? I mean: connect amp enable wire from SMPS1200 via the on/off switch to the EVAL board. Is that enough or is there another way to do this? I will remove S1 switch, do I need to remove R3 if I remove the switch?
OP
- Thread Starter
- #518
You want either a "real" power switch for the mains AC going into your power supply, OR some means of using a power supply standby mode, which likely needs a separate standby power supply (depending on your specific build details). @JimM gave his example build that does that:
https://www.audiosciencereview.com/...y-purifi-amp-builds.10478/page-20#post-314342
For reference, if you are happy to let the power supply be on all the time, you might want to do what Purifi appears to have done with their demo amps:
https://www.audiosciencereview.com/...y-purifi-amp-builds.10478/page-14#post-304953
Do NOT remove R3:
https://www.audiosciencereview.com/...y-purifi-amp-builds.10478/page-10#post-300209
Last edited:
I'm going to use an external relay that cuts AC power from the amp and is controller via preamp's 12V trigger outputs. Maybe I'll forget the front panel switch and put just a LED there. EVAL1 board has two status LEDs, are those just single color? Do they normally just remain on or do they do something during a startup?
