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Old 28th July 2015, 03:43 AM   #1
ScottG is offline ScottG  United States
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Default Your next compression driver?

IMO this is an interesting compression driver for a number of reasons.

1. Inexpensive,
2. Built via Tymphany (..better expected quality control)
3. "Strong" output below 1.5 kHz for a 1" exit driver
4. Pretty linear impedance above 1 kHz.
5. Metal diaphragm (and generally better detail production) but with:
6. Plastic surround (for better performance at lower freq.s)

Transducer Detail | Tymphany

Tymphany DFM-2535R00-08 1" Compression Horn Driver 2/4-Bolt 8 Ohm


Basically this looks like a 1" exit driver that you can cross-over as low as 1.4 kHz and still get good lower treble (..which is unusual IMO) - at a price that's actually more than reasonable.

..bug screen should be cut-out.
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Last edited by ScottG; 28th July 2015 at 03:45 AM.
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Old 28th July 2015, 05:44 AM   #2
ErnieM is online now ErnieM  United States
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Saw this earlier today. Looks very nice for it's intended purpose. The diaphragm is also coated as well. I suspect this driver sounds very good indeed. My current main system also (supposedly) uses coated diaphragms.
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Old 28th July 2015, 09:13 AM   #3
dave123 is offline dave123  United States
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Selenium D220Ti is also in that price range and sounds and measures pretty nice
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Old 28th July 2015, 04:32 PM   #4
ScottG is offline ScottG  United States
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Originally Posted by dave123 View Post
Selenium D220Ti is also in that price range and sounds and measures pretty nice
Most of the parameter's I listed, are not attributes of the D220Ti.

Because of its integrated surround - it's a driver I wouldn't cross over lower than 2.6-2.2 kHz. It's not that it can't do this, rather for best sound with a driver of this type it shouldn't be done (IMO). It tends to "flatten-out" depth a bit and give a more "strained" character to the lower treble.
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Old 28th July 2015, 07:22 PM   #5
freddi is offline freddi  United States
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that strained character sure can be apparent - PRV's D280ti is a nice inexpensive driver with more body than say ASD1001 when used on coax - it does best ~2K5 - even the tough old Eminence CD sound strained with a generic 1K6 network. This Tymphany looks good for the money and may make a very good K-tube driver.
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Old 16th August 2015, 10:14 AM   #6
ErnieM is online now ErnieM  United States
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Anyone try this out? I'm tempted to, but it's hard to justify with all the unused drivers around.
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Old 16th August 2015, 11:03 AM   #7
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No mention of which horn the response was generated on?

Could be an enormous flare to reach that low. Pretty cheap though. If you like plastic diaphragms, the Dayton polyimide diaphragm compression drivers may be good too?

The Selenium was used quite happily fairly low(some were as low as 1.6k) in some 'econowave' designs.

If you want a 1" to go stupidly low, the selenium D250 will do as low as 400hz on a huge horn BUT needs a tweeter above(bullet/slot or smaller 1" driver) The Klipsch guys love them at least.
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Old 16th August 2015, 02:23 PM   #8
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the bug screen may or may not be providing resistive loading...

looks interesting, but it's likely not good above about 16-17khz, and the break-up above may or may not be objectionable - IF you can hear that high (many can not).

a look at the innards and the diaphragm might be instructive.
depending on what the diaphragm physically is, it may or may not be retrofitable into another driver! which may or may not yield better or worse results depending on unknowns like the phaseplug geometry, etc...

the response curves may be smoothed, caveat emptor.
but they are inexpensive enough for someone to buy and do some tests, put up the curves and results...

fwiw, a typical top mfr will do compression driver tests on a plane wave tube, not on a horn.
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Old 16th August 2015, 03:12 PM   #9
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Originally Posted by bear View Post
fwiw, a typical top mfr will do compression driver tests on a plane wave tube, not on a horn.
Correct, which is why I have questions about the response curves tymphany have put up with off axis results! Clearly it's on a horn but NO mention of which...
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Old 17th August 2015, 02:53 AM   #10
ScottG is offline ScottG  United States
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Quote:
Originally Posted by bear View Post
the bug screen may or may not be providing resistive loading...

looks interesting, but it's likely not good above about 16-17khz, and the break-up above may or may not be objectionable - IF you can hear that high (many can not)..


..the response curves may be smoothed, caveat emptor..

..don't think the bug screen is an issue in that respect, the standard phasing plug will utterly dominate that. (..if it was a ring-type like BMS then it might considering there isn't any real phasing-plug, don't know - but BMS does use very shear fabric for their screens.)

It's showing good behavior to 17 kHz, BUT there may well be some added intensity due to a very small diffraction slot (for the horn) affecting that 14.5 - 17 kHz section (..which is "up" in level on the 0 & 30 degree axis relative to the 60 degree axis; the similarity between 0 and 30 degrees suggests a diffraction slot to me.) The resonance at nearly 22 kHz shouldn't be audible (..in part because it's so high in freq., and also because it's below the average). Basically then it's fairly linear for a titanium driver up to at least 14.5 kHz - and decent above that to 17 kHz without an effect that would be disturbing.

The response curves look to be no more than 1/24th octave smoothing (if that). But I'd say they definitely look smoothed - their coating just isn't going to lower the "hash" that much below the top octave. (..and likewise, the driver's very minute "hash" on the lower-end doesn't look much like ripple from the horn, more like a modestly smoothed condition when considering how narrow-band the "hash" is.)

One of the more interesting things to me in their graph is the Impedance trace.. That's a low fs and I'm not seeing higher freq. deviation due to the mouth's exit. To me that suggests its either a very deep narrow-directivity horn or a very wide and shallow waveguide. I'm guessing the former based on the output at lower freq.s and the substantial directivity.
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