• 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!

VTV Purifi Eval-1 build

OP
S
Joined
Mar 16, 2022
Messages
57
Likes
83
Location
Earth
So far really happy with the VTV, it sounds exactly like the PA5 & Outlaw 2160 (thou without any AB hissing) which is to say neutral without any coloration of the original signal. The only issue is when turning on/off via the rocker switch* I get a slight click sound thru the speakers even with no input devices connected.

It's not a loud sound and it happens immediately after the relay click sound coming directly from the amp (or practically simultaneously). I have no concerns about speaker damage but none of my other amps (PA5, Outlaw, ATI, Monoprice, Denon) make any on/off sound thru the speakers.

Is anyone else experiencing this?

*no longer use the standby sw because the front panel lite was always on and now using the rocker sw - lite-on/amp-on; lite-off/amp-off.
Reach out to VTV, because I'm not experiencing any of the issues that you've experienced (e.g. standby distortion, power switch pop.) I've turned mine off & on several times before doing a little re-arranging of cables and haven't heard anything.

Did you post your inquiry on any of the DIY Eval-1 build threads here to see if anyone else has experienced this and if they were able to rectify?
 

SCG

Member
Joined
May 3, 2022
Messages
42
Likes
24
Thanks for your feedback on not having the issue. Nothing has been had been posted on the DIY forums so I was checking if anyone with a VTV amp had the issue as it's either a VTV issue or a vendor component issue that will need to be resolved by VTV.

I've done enough testing to know it's not a upstream issue on my part and I need to contact VTV about supplying the 2 missing screws on the back panel so I'll also see what they say about this.

Speaking of feedback, I also came across this great technical write up from Bruno again from 2 years ago on his use of negative feedback in class D amps and forgot how good it was:

 
Last edited:

SCG

Member
Joined
May 3, 2022
Messages
42
Likes
24
I have two VTV Purifi EVAL2 mono block amps. I had to send one back recently because when I would power it on, it would cause a horrible surge of distortion thru the speaker it was connected to. This started randomly and then was pretty consistent. Before I sent it back, it was throwing two surges in a row. I could see a light inside the amp flashing for each surge. Extremely loud to the point that it would freak me out every time and I thought the speaker may have been blown (luckily not the case). This was with no XLR connected and I could switch it over to the other speaker and the problem would still happen. I should be getting the amp back soon. I point this out because the distortion you get when toggling standby (I dont have a standby switch on mine) may be something worth sending the amp back for repairs.
Hi Zorlac, did you get your amp back yet, how long did it take, and is it fixed?
 

CJH

Member
Joined
May 31, 2019
Messages
51
Likes
16
Just got a pair of the VTV monos with FE-3 input board (no 12v trigger). No problems at all. Been using a PA5 for over a year with LS50 Metas. The VTV monos do have a similar clean, neutral tonal balance with greater authority in the bass and midrange. I also feel the very highs are more linear on the monos (PA5 sounds just slightly rolled off). The PA5 has very low noise with black backgrounds and the Monos are even better. When listening to acapella chorus the individual voices are more easily distinguished. I did ask Warren to solder all four connections of the Neutrik 4LMP (+1, +2 and -1, -2) on the output. This allowed me to do the same with my 12AWG speaker cable giving me an effective 9AWG cord 4ft long. Happy so far.
CJH
 
Top Bottom