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Old 16th July 2003, 11:57 AM   #1
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Default Help with choosing tweeter

Hi

Tweeter needed:
  • <$30
  • Crossing over to a Vifa P13 at +/- 3500hz
  • Low FS
  • using a 2nd order electrical rolloff (1st if I can get away with it)
  • Vifa or Peerless (perhaps Morel)

Also, anyone ever used or evaluated the Peerless CSX 176 H - 850122 as a mid in a 3way?

http://www.d-s-t.com/peerless/data/850122.htm

The graph looks pretty smooth until a small hump at around 4k. Just looking higher power alternatives to the P13. Anyone?

Thanks.

Mos
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Old 16th July 2003, 01:18 PM   #2
delwon is offline delwon  United States
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Mos,
Given your criteria of <$30 and low Fs, you should definitely consider the Seas 27TFFC. I'm running one now with a 1st order (electrical) xover no problem. It's a very highly regarded tweeter.
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Old 16th July 2003, 08:49 PM   #3
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Hi Delwon

What's your XO freq for that tweeter and what are you crossing over to?

Mos
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Old 17th July 2003, 01:33 PM   #4
delwon is offline delwon  United States
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Mos,
I don't have any measuring equipment other than an SPL meter. I do everything by ear and I do it as simply as I can. I would guess that the acoustic xover point is in the range that you're thinking about, 3500ish hz. I'm running it with a 3uF cap and am running it with an Audax HM170G8 in 2.5 way configuration. The tweeter is also padded with a 3.5 ohm resistor.
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Old 17th July 2003, 01:58 PM   #5
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Ok... I think I can help here.

Check out my website. www.geocities.com/paul_hilgeman

I currently use the Focal TC90TDX with the 850122 in a 2-way.

I had previously used the T27TFFC, and switched to the focal because of a deal that I got on it. I am undoubtedly happier with the focal. Eventhough it has a rising top end, which is on their FR graph, and I measured it and saw, it sounds wonderful. It is VERY detailed and revealing. The Seas is softer and warmer, but the focal is neither warm, nor cold.

The 850122 is a great midwoofer. From my measurements, that peak is about 4dB. I cross at 2.2K 24dB per octave, and it is completely eliminated. I dont know if I would recomend it for a mid in a 3-way, I would always look for a smaller driver if I could. I would look at the smaller version of this woofer, the GR M130, the new Silver Flute Drivers, or the Vifa P13 for a midrange.

If you want to go with a huge box, that will probably never need a sub, go with two 850122 in a huge ~80Liters net internal volume, double Bass Reflex. This is what I would do if I had the space.

-Paul Hilgeman
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Old 17th July 2003, 09:13 PM   #6
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Thanks, Paul.

My original configuration for my 3way was:

2 x Vifa P21
1 x Vifa P13
1 x Morel MDT 20

I had considered the Peerless CSX 8" for the woofs but the vifas, although dearer, go a lot lower. WinISD said a 127L box for this but everything looks acceptable if you wind the volume down to 70 litres.

It's just the tweeter that was bugging me.

Mos
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Old 17th July 2003, 10:25 PM   #7
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I've never priced them, but the VIFA D27TG-45-06 is an almost perfect match for the P13 -- only XO required is a 5 uF cap. This T can be tweaked for better performance too.

dave
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Old 18th July 2003, 01:10 AM   #8
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Really? Do you know the XO freq for that? And the tweaking?

I assume that's a 6ohm tweeter. Is there any downside to simply putting a 2ohm+ resistor in series to bring the tweeter down to the other driver's sensitivity/impedance?

Thanks.

Mos
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Old 18th July 2003, 01:14 AM   #9
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Sorry, Dave. I guess I can work out the XO freq from the cap value.
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Old 18th July 2003, 02:31 AM   #10
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Quote:
Originally posted by Mos Fetish
Really? Do you know the XO freq for that? And the tweaking?
Not my project, check out the TLb, i expect somewhere in there the effective XO can be deduced (somewhere around 4 k is my guess). ChrisB went thru a lot of XO work on his Dalines when he replaced the Linn tweeter ... he ended up with a single cap as well.

The tweaking was done by another local fellow, and i'm not privy to everything he did, but the recipe goes basically like this... pull the back cover, smooth & damp the internal bits with ductseal, and add a larger, less rectangular rear enclosure with revised damping. You could take it a step further an build a B&W-like TL.

dave
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