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Old 17th August 2015, 11:51 AM   #11
xrk971 is offline xrk971  United States
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Your next compression driver?
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Originally Posted by freddi View Post
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.
+1 on this driver. Even though budget priced and same as subject CD from Tymphany - it extends even lower has metal Ti diaphragm, same sensitivity, and a cleaner top HF extension. I really like it and highly recommend it for your next project. Does not have sibillance.

PRV Audio D280Ti-B 1" Titanium Horn Compression Driver 8 Ohm 2/3-Bolt
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Old 17th August 2015, 06:20 PM   #12
ScottG is offline ScottG  United States
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I'd like to see real measurements on that, and would like to know what the surround is made of.

One of the things I think is particularly important is Impedance. Many compression drivers (lower and higher priced offerings) have Impedances that require so much compensation for a decent result that using nicer passive components in the design results in a compensation network that is more expensive than the driver itself. This is that "cart before the horse" thing that can make an otherwise inexpensive build turn into something costly (both monetarily and quite often subjectively - ie. poorer sound).
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Old 18th August 2015, 03:11 AM   #13
xrk971 is offline xrk971  United States
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Originally Posted by ScottG View Post
I'd like to see real measurements on that, and would like to know what the surround is made of.

One of the things I think is particularly important is Impedance. Many compression drivers (lower and higher priced offerings) have Impedances that require so much compensation for a decent result that using nicer passive components in the design results in a compensation network that is more expensive than the driver itself. This is that "cart before the horse" thing that can make an otherwise inexpensive build turn into something costly (both monetarily and quite often subjectively - ie. poorer sound).
The D280Ti measures very close to factory curve with a kink in the LF but smooth above 1200Hz. If you look at a photo of the replacement diaphragm, it looks all titanium with a what appears to be a pattern of diamond shaped dents around the surround to allow the metal to flex.

PRV Audio RPD280Ti Replacement Diaphragm for D280Ti

Here is the measured impedance in a PRV WG16-25-B waveguide:

Click the image to open in full size.

Here is the measured response (in green) but with a highpass at 3500Hz for the Harsch 3-way XO. I did not save the response below this XO frequency:

Click the image to open in full size.
Attached Images
File Type: png D280Ti-WG16-25-B-Impedance.png (51.0 KB, 943 views)
File Type: png Harsch-3-way-XO.png (95.2 KB, 939 views)

Last edited by xrk971; 18th August 2015 at 03:31 AM.
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Old 18th August 2015, 04:40 AM   #14
Lunchietey is offline Lunchietey  Australia
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You can't compare the tymphany to any other compression driver unless it's done under the same conditions.

No one knows which horn was used on the tymphany and a compression drivers response, low end limit and high frequency behaviour are extremely heavily dependant on the horn design.

Comparisons based on unknown test procedures are utterly meaningless.
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Old 18th August 2015, 10:03 AM   #15
xrk971 is offline xrk971  United States
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Originally Posted by Lunchietey View Post
You can't compare the tymphany to any other compression driver unless it's done under the same conditions.

No one knows which horn was used on the tymphany and a compression drivers response, low end limit and high frequency behaviour are extremely heavily dependant on the horn design.

Comparisons based on unknown test procedures are utterly meaningless.
Utterly meaningless is a bit much don't you think? You will probably have what is representative from Vifa/Tymphany perhaps the most favorable waveguide or horn that they have for the results they post on their data sheet. So don't expect better performance. Tymphany is pretty good about their frequency measurements being fairly accurate and not put through some sort of PR image enhancement campaign like some manufacturers. (Like 120dB vertical scales)

Shame on Tymphany for not stating waveguide used. PRV does on their data sheet. On my measurement you can see what the waveguide did to the impedance - put a big peak at the 1500Hz design cutoff frequency.
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Old 18th August 2015, 11:15 AM   #16
Lunchietey is offline Lunchietey  Australia
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Utterly meaningless for comparison with different horns yes. Horns dramatically shape almost all aspects of a drivers performance as far as raw frequency response is concerned.

You can make a few rough guesses like the tymphany graph is likely a radial horn due to fairly linear on axis response and sagging off axis response as frequency increases. If it were a constant directivity horn, on axis response would have a similar droop.

As a really random example, a paudio ph220 gives a midrange hump in its response which is present on different compression drivers on the same horn but not present on different horns. You could put a weak compression driver on this horn and push a frequency response chart below 2khz not knowing it's horn related and on a different horn would lose 8 to 10db at 2-3khz.

So yes, unless you know how that driver was tested, it means very little.
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Old 15th June 2017, 05:09 PM   #17
manninen is offline manninen  Finland
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Quote:
Originally Posted by ScottG View Post
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.
Been thinking to buy that tymphany
havenīt found out much thoughts that from the web

PD.CD1N
this interests me too
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Old 8th February 2018, 04:18 AM   #18
ScottG is offline ScottG  United States
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..it's been a while.

but:

Peerless by Tymphany DFM-2535R00-08 Compression Driver
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Old 25th May 2019, 10:05 AM   #19
manninen is offline manninen  Finland
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Any updates on small size high quality compression drivers?
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Old 25th May 2019, 10:16 AM   #20
cowanaudio is offline cowanaudio  Australia
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Your next compression driver?
The BMS 4552ND sounds really good, is small and plays low. It's my current choice for 1" compression drivers at the moment.
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