• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true). There are daily reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Purifi EVAL1 EIGENTAKT Class D Amp Designs

Andykay

Member
Joined
Nov 1, 2021
Messages
23
Likes
11
I'm m looking for persons who have purchased the Purifi EVAL1 EIGENTAKT based systems and any build mods. I'm looking for a Canadian Supplier with track record. I live in Canada and have only found VTV so far.

I'm planning on using a VTV Purifi type amplifier as a front left and right Channel amplifier connected via XLR to a Yamaha 3080 AVR.

FYI, the Purifi EVAL1 EIGENTAKT setup is now shipping in the NAD C298 (similar to NAD M33 in theory) with what looks like a custom buffer power supply. I have only seen pics and have not done a teardown with one yet. It's price is $2,899.00 CAN which seems steep for NAD stuff.

Please share your experiences.
 

Attachments

  • Screenshot_20211110-095417_Chrome.jpg
    Screenshot_20211110-095417_Chrome.jpg
    321.6 KB · Views: 94

Phorize

Major Contributor
Forum Donor
Joined
Apr 26, 2019
Messages
1,288
Likes
1,705
Location
U.K
I'm m looking for persons who have purchased the Purifi EVAL1 EIGENTAKT based systems and any build mods. I'm looking for a Canadian Supplier with track record. I live in Canada and have only found VTV so far.

I'm planning on using a VTV Purifi type amplifier as a front left and right Channel amplifier connected via XLR to a Yamaha 3080 AVR.

FYI, the Purifi EVAL1 EIGENTAKT setup is now shipping in the NAD C298 (similar to NAD M33 in theory) with what looks like a custom buffer power supply. I have only seen pics and have not done a teardown with one yet. It's price is $2,899.00 CAN which seems steep for NAD stuff.

Please share your experiences.
I’m not sure about built systems but. @tomchr sells a good buffer stage if you were thinking diy. He may be able to give you a steer on what his other customers are doing.
 

tomchr

Addicted to Fun and Learning
Manufacturer
Forum Donor
Joined
Nov 5, 2018
Messages
946
Likes
2,511
Location
Calgary, Canada
I’m not sure about built systems but. @tomchr sells a good buffer stage if you were thinking diy. He may be able to give you a steer on what his other customers are doing.
I'm happy to build amps. I should probably figure out the pricing... :)

Tom
 

dwkdnvr

Senior Member
Joined
Nov 2, 2018
Messages
377
Likes
588
I'm happy to build amps. I should probably figure out the pricing... :)

Tom
That might be interesting.

I'm currently sitting here wondering whether I should feel guilty about considering replacing my Mod-86 with a VTV Purifi and then adding Neurochrome buffers.....
 

pogo

Addicted to Fun and Learning
Joined
Sep 4, 2020
Messages
608
Likes
140
This seems to be the best sounding implementation at the moment:
Link

A big advantage is the switchable damping factor!
 

boXem | audio

Major Contributor
Manufacturer
Joined
Jun 19, 2019
Messages
1,526
Likes
3,048
Location
Europe
This seems to be the best sounding implementation at the moment:
Link
Why would it be better sounding than other implementations?
A big advantage is the switchable damping factor!
That's indeed an interesting differentiator. I just don't get the point of lowering the damping factor. Could you please explain?
 

tifune

Addicted to Fun and Learning
Forum Donor
Joined
Jan 18, 2020
Messages
857
Likes
562
A big advantage is the switchable damping factor!

That's interesting, I sort of dismissed damping factor years ago after reading this (which Im not qualified to confirm or refute)


is it worth reconsidering?
 

Matias

Major Contributor
Forum Donor
Joined
Jan 1, 2019
Messages
3,465
Likes
6,497
Location
São Paulo, Brazil

boXem | audio

Major Contributor
Manufacturer
Joined
Jun 19, 2019
Messages
1,526
Likes
3,048
Location
Europe

pogo

Addicted to Fun and Learning
Joined
Sep 4, 2020
Messages
608
Likes
140
Why would it be better sounding than other implementations?

That's indeed an interesting differentiator. I just don't get the point of lowering the damping factor. Could you please explain?
I have written that it seems so. According to the test report, the T+A scored more sound points than the NAD C298.

'A high damping factor tends to produce a more clearly defined, very precise and analytical sound image, whereas a reduced damping factor produces a more warm and softer sound image.' <- extract from the manual

@Bruno Putzeys
What are the advantages of this new implementation of the purifi modules?
 

pogo

Addicted to Fun and Learning
Joined
Sep 4, 2020
Messages
608
Likes
140
is it worth reconsidering?
Definitely, but it depends on the speakers you use or your own taste. My speakers need a high DF, otherwise my low frequency range sounds spongy and my room modes are unnecessarily excited, meaning I have to correct less with a DSP and sound details are also preserved.
Conversely, speakers with deficits in the low frequency range can be subjectively improved with a low DF.
 

boXem | audio

Major Contributor
Manufacturer
Joined
Jun 19, 2019
Messages
1,526
Likes
3,048
Location
Europe
I have written that it seems so. According to the test report, the T+A scored more sound points than the NAD C298.
My own implementation of the Purifi modules was recently subjectively reviewed against two other amplifiers using different technologies, but also at different price points.
Very well written and documented, several pages, all sort of musics listened, nice to read.
Summary in half a line: the most expensive sounds the best, the least expensive sounds the worst. Bad luck for me, my amplifier was the least expensive :D. What was particularly hard to swallow was that I consider one of the two other amplifiers as "$hit packed in golden paper" and it was supposed to sound better.
 

peng

Major Contributor
Forum Donor
Joined
May 12, 2019
Messages
3,004
Likes
2,512
I still like my VTV Purifi amp a lot but also still don't like the banana plug receptacles and speakon connectors instead of the typical binding posts. Actually I may like speakon, as I have never used them before. Can someone suggest speakeron to banana plug (speaker side obviously that will work well with the Eigentakt Eval1 amp? I have been searching it on Amazon, and see there are different kinds of speakon connectors.

Almost bought this one:

When reading the reviews, someone said its a 4 point contact type (instead of 2) and I am not sure if that is the best for my amp.


815McScyW-L._AC_SL1500_.jpg
 

BlackTalon

Senior Member
Joined
Apr 14, 2021
Messages
303
Likes
466
Location
DC
I cut the banana plus off one end of the speaker cables and replaced with speak on connectors. Super easy. the wires get clamped in the connector by screws. All you need is snips that can cut through the cable, wire strippers and a screwdriver. 15 minute project the first time.
 

tomchr

Addicted to Fun and Learning
Manufacturer
Forum Donor
Joined
Nov 5, 2018
Messages
946
Likes
2,511
Location
Calgary, Canada
I think the confusion is about the 2-pole vs the 4-pole type of speakON.

A 2-pole connector, such as the Neutrik NL2FX, makes two connections. One for Speaker+ (1+) and another for Speaker- (1-).
A 4-pole connector (Neutrik NL4FX) makes four connections: 1+, 1-, 2+, and 2-. This means you can use one cable to power two speakers or you can use one cable to power tweeter+woofer in a two-way bi-wired speaker.

The two-pole NL2FX will mate with a 4-pole chassis connector, but only make connections to two connections (1+ and 1-). I don't know if a 4-pole cable connector (NL4FX) will mate with a 2-pole chassis connector. One could ask Neutrik.

As mentioned above, I'd just buy the cable connectors and make the cables myself. It's pretty easy. Just follow the instructions on the package for how to strip the wire and you'll be fine. The connectors are available through Mouser: www.mouser.com and others.
Another trick I use if I need a speakON-to-wire end cable is to buy a speakON cable and cut it in half. GLS makes some quite nice cables. The cable is typically 12-14 AWG stranded with a flexible rubber jacket. It's nice to work with. The connectors are by Neutrik. You can buy from GLS directly or find them at Bezos' Bookstore.

BTW: I wouldn't bother with adapters. The point of this exercise is to get rid of the banana plugs.

Tom
 

peng

Major Contributor
Forum Donor
Joined
May 12, 2019
Messages
3,004
Likes
2,512
I think the confusion is about the 2-pole vs the 4-pole type of speakON.

A 2-pole connector, such as the Neutrik NL2FX, makes two connections. One for Speaker+ (1+) and another for Speaker- (1-).
A 4-pole connector (Neutrik NL4FX) makes four connections: 1+, 1-, 2+, and 2-. This means you can use one cable to power two speakers or you can use one cable to power tweeter+woofer in a two-way bi-wired speaker.

The two-pole NL2FX will mate with a 4-pole chassis connector, but only make connections to two connections (1+ and 1-). I don't know if a 4-pole cable connector (NL4FX) will mate with a 2-pole chassis connector. One could ask Neutrik.

As mentioned above, I'd just buy the cable connectors and make the cables myself. It's pretty easy. Just follow the instructions on the package for how to strip the wire and you'll be fine. The connectors are available through Mouser: www.mouser.com and others.
Another trick I use if I need a speakON-to-wire end cable is to buy a speakON cable and cut it in half. GLS makes some quite nice cables. The cable is typically 12-14 AWG stranded with a flexible rubber jacket. It's nice to work with. The connectors are by Neutrik. You can buy from GLS directly or find them at Bezos' Bookstore.

BTW: I wouldn't bother with adapters. The point of this exercise is to get rid of the banana plugs.

Tom

Yes the 2-pole vs 4-pole confused me. Thank you for explaining the difference, so since my Purifi amp is a typical stereo amp the connectors must be 2- pole. Unfortunately Amazon.ca don't sell any 2-pole ones, all the connectors I could find are the 4-pole type, some even says "female". I wonder why Purifi would supply this Eigentakt kit thing with professional connectors instead of the regular binding posts.

Monoprice has one that looks like it would work but it does not have the NL2FX, instead it has the NL4FC, but they are on a 2-conductor cable??

Monoprice 108769 10-Feet 12AWG 2-conductor Speakon Type NL4FC Female-Inch Speakon Type NL4FC Female Cable


DO01030093-scaled.jpg



The one that has the number you mentioned is only 14 AWG but I guess I have to buy reluctantly, and use your nice trick of cutting it in half.

Do you think it will mate with the Purifi Eigentakt Eval1?

61TjzdxbbpL._AC_SL1500_.jpg


Thank you very much for your help.
 
Top Bottom