Group Buy: Peerless by Tympahny DFM-2535R00-08

[changer]

This thread provides a purchasing option for the 1-inch compression driver DFM-2535R00-08



The driver is not available anymore in single units and hence unobtainable for consumers. With this group buy in cooperation with a Tymphany distributor from Germany DiY-ers can once again purchase a pair of the much discussed and HiFi optimized compression driver that has some special properties.

The price for one driver DFM-2535R00-08 will be around 40 Euro excluding VAT. As an example, for buyers from Germany with 19 percent VAT, the end price is about 48 Euro total. Plus shipping from Germany. In general, it is possible to ship world wide, depending on your willingness to pay the costs. Shipping to the US for example is usually at least 50 Euro, on top of all of this customs fees will be applied. EU shipping is standard.

The condition for the distributor to stock the lot is an order of a minimum of 50 pairs / 100 pieces. Please enter your contact details and the amount of drivers you want to buy in this google forms link: https://forms.gle/zszS5UC68y8xskvJ6

When the necessary amount of buyers is reached, we will proceed with transaction. This can be done via bank account or PayPal.


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Some facts on the compression driver DFM-2535R00-08:

The compression driver is optimized for high quality sound reproduction, combining a polyimide surround with a coated titanium diaphragm. Thus it equally provides the benefits of a TI diaphragm, that is detailed high frequency reproduction, while also enabling the smoothness of a polymer surround. Additionally, it enables a low crossover frequency of 1 kHz LR24, making it a perfect fit for 2-way home audio speakers with waveguides. This compression driver is not optimized for high SPL.

[1] Distortion measurements. A crossover at 1.1 kHz LR24 promises <1 percent distortion for 96 dB at 1m throughout the passband (HD2):

-> source

[2] Burst decay. The main resonance of the diapragm is pushed to the very high frequencies:

-> source

[3] Detail images of the driver construction courtesy @Zvu:


-> source

[4] Review from audioxpress

https://audioxpress.com/article/peerless-by-tymphany-dfm-2535r00-08-compression-driver

This thread is not to discuss the driver, please use the technical threads instead. This group buy originated from a diyaudio.com forum thread: https://www.diyaudio.com/community/...-tympahny-dfm-2535r00-08.415988/#post-7755622 If you want to share this group buy on another board, you are welcome. Please send me a message so that I know.

 

[changer]

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[changer]

For comparison, this is the driver performance measured on an optimized free-standing waveguide with a custom throat adapter that matches the driver exit angle starting at the driver phase plug:


-> source

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[changer]

A milestone was reached today:

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We have currently reached: ██████████░░░░░░░░░░ 50%

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DFM-2535R00-08 technical drawing:

 

[changer]

Burst decay spectogram (1/3 octave resolution ) of the DFM-2535 on an 520 mm diameter Ath Gen2 waveguide. For this, the frequency response was linearized between 1 kHz and 20 kHz.

Waterfall graph of the DFM-2535 on an 520 mm diameter Ath Gen2 waveguide.

Equalized frequency response.

34 drivers left: https://forms.gle/zszS5UC68y8xskvJ6

 

[jamescarter1982]

hi I have signed up for this group buy I just wondered earlier on in the thread you showed a frequency response of this drover in a custom horn I believe is this horn design open to the comunity at all though this might be ideal to use with my drovers when they come . thanks

 

[changer]

Thanks James!

The horn / waveguide which was used for this measurement is available for purchase as a print-it-yourself 3D printing file:

ATH A520G2

Der Hauptkörper für den ATH A250G2 Waveguide. Weitere Informationen unter: http://at-horns.eu/gen2.html Erforderliche Druckbettgröße: 185 x 185 mm Druckhöhe: 170 mm Hinweis: Dies ist nur der Hauptkörper. Halsteile sind separat erhältlich.

cults3d.com

If you have no 3D printing capabilities a service provider might be a solution: https://jlc3dp.com/
There is also smaller diameter waveguides that will perform very similar. Please take a look at the website of the creator of the advanced transition horns Marcel Batik:

ATH - Gen2

Advanced Transition Horns

www.at-horns.eu

26 drivers left: https://forms.gle/zszS5UC68y8xskvJ6

 

[jamescarter1982]

thankyou I'll have a look at that .thanks again !!

 

[changer]

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Here are some examples for commercial waveguides and horns that allow for a 1 kHz crossover.

18Sound XT1464, 60 x 50 degree:


Celestion H1-9040P (ex. Monacor MRH-200), 90 x 40 degree:

-> source

15 drivers left: https://forms.gle/zszS5UC68y8xskvJ6

 

[hex168]

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Here are some examples for commercial waveguides and horns that allow for a 1 kHz crossover.

18Sound XT1464, 60 x 50 degree:
View attachment 387816

Celestion H1-9040P (ex. Monacor MRH-200), 90 x 40 degree:
View attachment 387817
-> source

15 drivers left: https://forms.gle/zszS5UC68y8xskvJ6

Also see:

MTG Designs - Waveguide Shootout

Objective Tests / Measurements of Various Horns and Waveguides This project was started in 2013, then nearly abandoned for several years and finally restarted last year (2021). The idea is to test and provide various measurements on a wide range of waveguide and horn designs making it easier to

www.mtg-designs.com

Many of the waveguides tested are NLA or one-offs, but some look quite interesting:
Electro-Voice ELX112 Horn
Pi H290C

 

[kemmler3D]

Hmm, tempting to get a couple of these and pair them up with Purifi 10" woofers... unfortunately the compression driver is not the difficult thing to budget for...

 

[changer]

An amendable 10-inch mid-woofer is the PHL 3411. It is not the exact woofer used by Genelec for their S360A, but should be very close. It is the what I use.

For home audio, however, depending on the intended radiation pattern, an 8-inch woofer should be very good for SPL and distortion. It can be better crossed to a wider pattern waveguide.

 

[changer]

Good news: since yesterday, we have crossed the 90 percent mark. There is now only five more pairs until we reach the minimum order amount required.

Please sign up here if you want to buy the DFM-2535: https://forms.gle/zszS5UC68y8xskvJ6

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I wish you all a pleasant Sunday!

Best regards

 

[rank]

The Peerless DFM-2535R01-08 (also low admissible power) is widely available everywhere (for example in Europe, I think you german ?!) for less than 30 euros, so what's the point of the old model?
In addition, it is necessary to adapt a horn and a bass-midrange of about 100 dB efficiency. Cos' otherwise we do not benefit from its main characteristic...

​

 

[changer]

Thanks for your thoughts!

But the driver you have mentioned does not share any of the technical characteristics of the DFM-2535R00-08.

And yes, the general concept of the controlled directivity two-way waveguide speaker is usually build around a high efficiency mid-woofer. However, after five years of discussion and collaborative effort in modelling, building and testing, the two properties of compression drivers which still stand out is the ability to cross them at a unsually low frequency, and their plane wavefront, which up until 10 kHz is easily controlled with an andvanced waveguide that mitigates impariments by diffraction. The DFM-2535R00-08 is a competent design in this regard.

 

[bigjacko]

But the driver you have mentioned does not share any of the technical characteristics of the DFM-2535R00-08.

Do you know the difference between them and why the 00 is better?

 

[Joe BKNY]

Thanks for your thoughts!

But the driver you have mentioned does not share any of the technical characteristics of the DFM-2535R00-08.

And yes, the general concept of the controlled directivity two-way waveguide speaker is usually build around a high efficiency mid-woofer. However, after five years of discussion and collaborative effort in modelling, building and testing, the two properties of compression drivers which still stand out is the ability to cross them at a unsually low frequency, and their plane wavefront, which up until 10 kHz is easily controlled with an andvanced waveguide that mitigates impariments by diffraction. The DFM-2535R00-08 is a competent design in this regard.

Thank you for the information and the opportunity! Are you aware of any DIY designs that use this driver - particularly ones that you think are successful?

 

[changer]

For example, the "Asathor - a JBL 4367 Clone" has initially been build with the DFM-2535.

German language instruction: https://www.der-akustische-untergrund.de/speakers/power-hifi-projects/asathor-preiswerte-männerbox/

Do you know the difference between them and why the 00 is better?

The differences are apparent from the respective datasheets and this thread is dedicated to the group buy of the driver DFM-2535R00-08.

 

[jamescarter1982]

hi is there any updates about this group buy ? I can't find the email you sent me so hope you don't mind me asking here , not having participated in a group buy before I'm not sure how it all works . when will you require payment ?
thanks In advance
kind regards James
[email protected]

 

[changer]

Hello James,

sorry, only updated on diyaudio: The dealer informed me our order was confirmed by Tymphany on 09-26-2024. Since then no updates and I will not bother him for now, as I have already written to him in a previous email that I am happy to relay any information from Tymphany to the participants, if he receives any.

Payment is due only after the drivers arrived in Germany. After production (ca. 90 days), after maritime transport from PRC (ca. 6 weeks). You will purchase the drivers from the dealer directly, I am not involved.

Best regards