AudioCircle

Audio/Video Gear and Systems => Owner's Circles => Selah Audio Owners => Topic started by: HT cOz on 17 Jul 2020, 06:02 pm

Title: Purifi in the house
Post by: HT cOz on 17 Jul 2020, 06:02 pm

Selah has begun testing out the new Purifi woofers for consideration in a few configurations.  Likely two and three-way designs will be released in the future.  So far, Rick says he is impressed with the drivers and has compared them favorably to SB and

Here is some background on the new Purifi brand https://purifi-audio.com/about/ (https://purifi-audio.com/about/)  I was impressed enough to buy one of their new amplifiers.  Bruno needs no introduction but I'm also a huge fan of Lars Risbo who designed the Texas Instrument Equibit amp and am still using a Panasonic unit for home theater. 

This is a nice write up on some of the early outputs from the Purifi.  https://audiophilestyle.com/ca/reviews/purifi-ptt65-woofer-and-1et400a-amplifier-technology-review-r866/ (https://audiophilestyle.com/ca/reviews/purifi-ptt65-woofer-and-1et400a-amplifier-technology-review-r866/)


Here are a few pics of development work. 
BZ Tweeter with Purifi a combination which is sure to punch a great value proposition
(https://www.audiocircle.com/image.php?id=211892)

Test Cab as the Purifi woofer was the same size as the woofer used in the JB Tribute.  I don't believe the other drivers are connected. 
(https://www.audiocircle.com/image.php?id=211893)

Close Up
(https://www.audiocircle.com/image.php?id=211894)

More to come as news develops...

Thanks,
Robert

Title: Re: Purifi in the house
Post by: poseidonsvoice on 17 Jul 2020, 06:18 pm

Thanks for the updates...looks cool  :green:

Best,
Anand.

Title: Re: Purifi in the house
Post by: Jon L on 17 Jul 2020, 08:44 pm

(https://live.staticflickr.com/65535/50123197683_2c586a1a5a_h.jpg) (https://flic.kr/p/2jndupv)CQ76Tweeter (https://flic.kr/p/2jndupv) by drjlo2 (https://www.flickr.com/photos/60017347@N03/), on Flickr

That BZ Audio tweeter is very interesting.  Looks like ribbons, but it turns out to be much more rigid in material and structure as can be seen by their demo with 100 gram weight placed on the ribbon element. 
What worries me is the diaphragm looks to be much heavier than traditional ribbons (no weight info given), and this likely explains the relatively low 91dB sensitivity relative to other ribbons.  Would love to listen to this tweeter to see if it can match traditional ribbons' airiness and delicacy.  I do suspect much more power handling and robustness of sound  :thumb:

 

Title: Re: Purifi in the house
Post by: HT cOz on 18 Jul 2020, 01:09 am

I opted for the Raal in my build.  :D  Still wondering about the 70xr though  :scratch:

Title: Re: Purifi in the house
Post by: TF1216 on 18 Jul 2020, 01:11 am

Hi HT cOz,
See the Raal and Purifi build happening on diyaudio?
https://www.diyaudio.com/forums/multi-way/356906-raal-70-20xr-ptt6-5-compact-tl.html

Title: Re: Purifi in the house
Post by: uncola on 18 Jul 2020, 08:25 am

I’m psyched!  Thinking about the 2 way.  Ht coz did you already ask rick to build you one with raal?

Title: Re: Purifi in the house
Post by: HT cOz on 18 Jul 2020, 05:39 pm

Quote from: uncola on 18 Jul 2020, 08:25 am

I’m psyched!  Thinking about the 2 way.  Ht coz did you already ask rick to build you one with raal?

My speakers are Ceramicas which are a three way with smaller Raal. A two way could be done with Raal and Selah has two way Raals in the past.  We will just have to wait and see what happens.

Here is an example of a past speaker which is a Raal two-way.

(https://www.audiocircle.com/image.php?id=211992)



Thanks
Robert

Title: Re: Purifi in the house
Post by: Rick Craig on 19 Jul 2020, 06:45 pm

Quote from: Jon L on 17 Jul 2020, 08:44 pm

(https://live.staticflickr.com/65535/50123197683_2c586a1a5a_h.jpg) (https://flic.kr/p/2jndupv)CQ76Tweeter (https://flic.kr/p/2jndupv) by drjlo2 (https://www.flickr.com/photos/60017347@N03/), on Flickr

That BZ Audio tweeter is very interesting.  Looks like ribbons, but it turns out to be much more rigid in material and structure as can be seen by their demo with 100 gram weight placed on the ribbon element. 
What worries me is the diaphragm looks to be much heavier than traditional ribbons (no weight info given), and this likely explains the relatively low 91dB sensitivity relative to other ribbons.  Would love to listen to this tweeter to see if it can match traditional ribbons' airiness and delicacy.  I do suspect much more power handling and robustness of sound  :thumb:

Yes, higher mass but also increased stiffness and support of the ribbon / planar element lowers the distortion and increases the low end bandwidth. The mass is still low enough to have good frequency extension beyond 20K. Ribbon sensitivity figures can be misleading with some having a very steep rising response. In order to flatten out the curve you can lose quite a bit of sensitivity.

Title: Re: Purifi in the house
Post by: Rick Craig on 27 Jul 2020, 04:03 pm

More testing today to finalize the crossover. Looking forward to an upcoming local demo!