Four Vifa p13wh00-08s and two Scan Speak d2905-950000 - diyAudio
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Multi-Way Conventional loudspeakers with crossovers

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Old 6th February 2017, 08:33 AM   #1
suzyj is offline suzyj  Australia
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Default Four Vifa p13wh00-08s and two Scan Speak d2905-950000

Just ordered a bag of drivers. Picked up a pile of 19mm ply and 16mm MDF on the weekend. Now I'm wearing my router out
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Old 6th February 2017, 09:24 AM   #2
Lojzek is online now Lojzek  Croatia
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Wonderful units. Do you have it all figured out or still contemplating?
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Old 6th February 2017, 09:39 AM   #3
suzyj is offline suzyj  Australia
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I'm building a pair of Ariels. I figure it's time I dragged my sorry **** into the nineties
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Old 6th February 2017, 10:30 AM   #4
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Originally Posted by suzyj View Post
I'm building a pair of Ariels. I figure it's time I dragged my sorry **** into the nineties
Ice, Ice Baby.

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Old 7th February 2017, 01:35 AM   #5
system7 is offline system7  United Kingdom
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It's all a bit of a mystery why Vifa should have discontinued one of their best ever drive units.

A lovely flat 5" bass/mid driver.

But the modern afficionado can seek out some similar drivers:
Peerless HDS PPB 830860

The Peerless HDS PPB 830860 clearly does much the same thing.
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Old 7th February 2017, 03:39 AM   #6
suzyj is offline suzyj  Australia
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I'm not sure they're discontinued:

https://www.wagneronline.com.au/vifa...rs-pa/3219/fl/

I think they're just made by Peerless now.

I've been using the P13WH for a good number of years in a pair of little ported 2-ways, along with the Vifa D27TG-35-06 tweeter. The design is from here: diyAudio reference speaker project

They're really lovely little monitors. They're always either on my desk or by my bed. Great detailed midrange - perfect for guitar and vocal, which is ~80 percent of the music I like. My only complaint is that they really are lacking in bass. The Ariel gives me another 6dB of bass thanks to the dual mid-woofers, plus the transmission line allegedly extends the bass down to fs...

Not to mention that they look really nice and they're a good woodworking project, and I'm in the mood for cutting some wood up.

Here's one of my little "diyAudio reference" speakers:

Click the image to open in full size.
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Old 7th February 2017, 12:56 PM   #7
rabbitz is offline rabbitz  Australia
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I remember those and they were a lot lighter back then and yes, they are bass shy.
diyAudio reference speaker project

For reference for other builders, a good alternative to the P13 is SB15MFC30-8 and even works in some of the xo's I used for the P13/D27 with some tweeter padding changes.

Have fun with your new build.
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Last edited by rabbitz; 7th February 2017 at 01:02 PM.
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Old 8th February 2017, 12:32 AM   #8
system7 is offline system7  United Kingdom
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The SB 5" MFC polycone is a good idea, Rabbitz.
5" SB15MFC30-8 :: SB Acoustics

It's very similar to the 0.7mH Le Vifa, just a lower inductance at 0.14mH due to damping rings. I've been playing with some variants on the SB Acoustics Elok idea. It's third order essentially. You can put resistance in the bass shunt.

I'd guess if you put a 0.5mH coil in front of it, to put the inductance back and take out the HF hash, it would work with Lynn Olson's Ariel crossover.

Scott Blaier has harsh things to say about single cap crossovers:
Quote:
Remember, this is a price class where one cheap electrolytic capacitor passes for a crossover, cheap cone tweeters are the status quo, and 1/8 or 1/4 inch unbraced undamped plastic or wood boxes pass for an enclosure.
But a 5" MTM is always an easy project, whatever your design goals.
Attached Images
File Type: jpg Rabbitz design.JPG (61.8 KB, 506 views)
File Type: png Scott Blaier Esquire.PNG (11.9 KB, 507 views)
File Type: png Vifa P13WH-00-08.PNG (78.0 KB, 498 views)
File Type: png 5 SB15MFC30-8.PNG (66.5 KB, 493 views)
File Type: png SB Acoustics ELOK Kit.PNG (21.4 KB, 78 views)
File Type: jpg Gryphon_Mojo_Duelund_Loudspeaker.JPG (33.9 KB, 154 views)
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Old 8th February 2017, 02:00 AM   #9
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suzyj,
I remember reading, years ago, about your take on the AEM5000. Are you going to drive them with that?
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Old 8th February 2017, 03:55 AM   #10
suzyj is offline suzyj  Australia
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Originally Posted by Tromperie View Post
suzyj,
I remember reading, years ago, about your take on the AEM5000. Are you going to drive them with that?
Yes, at least with a further refinement of it. See Even order distortion in symmetrical amp

Through a bit of tweaking, mainly in substitution of VAS and second-stage transistors and working on the compensation network I've pushed THD down quite a bit from where I was when I first built it. 1KHz THD is now around 2-3ppm, and 10KHz is not too bad, at 10-20ppm.

My plan is to biamp with a 100W one for the woofers and a 50W one for the tweeters. I've got a bit of work to do to reverse engineer the Ariel crossover so I can do it actively.
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