Tymphany DFM-2535-R00-08 in SB Audience H225 90x60 degree constant directivity horn

[jimk04]

Very much home/hifi and not PA. Modest size UK room. 3m listening distance or so

 

[ICG]

The combination of the SB Audience H225 and the Tymphany DFM-2335 will perform nicely in that setup. The ATH A460 will perform better at bigger distances or lower xo's (with bigger drivers).

 

[jimk04]

Thanks. And can I ask again what may a passive XO look like.? As regards flattening the response.

 

[ICG]

I'm sorry, I've only made a DSP setup for a friend, not a passive xo. He usedd 2 cheap 10" drivers with a 2.5 way setup without a sub and a 2-way with subwoofers. At 2,2k the CD could surprisingly keep up but the headroom for live (feedback!) should have been a bit higher.

 

[miero]

For a constant directivity up to 15kHz check the ATH A460D variant.
- https://at-horns.eu/A460D.html

But that has not yet been measured with the DFM 2335.

 

[AllenB]

Thanks. And can I ask again what may a passive XO look like.? As regards flattening the response.

The polars as shown by miero above have a nice natural fall with frequency along with increasing DI. Sometimes that sounds OK as is. On the other hand the direct answer to your question probably involves a series resistor with a capacitor across it.

 

[miero]

But that has not yet been measured with the DFM 2335.

I got confused by incorrect model number in the thread subject. There are measurements of A460D with DFM 2353.
- https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-7826267

 

[AllenB]

For that one I'd begin with an L-pad to help with the impedance, a notch filter around 3kHz and second order high pass... just to show what could be done. The real crossover would likely be more involved.

 

[tktran303]

I got confused by incorrect model number in the thread subject. There are measurements of A460D with DFM 2353.
- https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-7826267

@AllenB

Would you kindly change the title of this thread to 2535?

Thanks in advance

 

[tktran303]

Very much home/hifi and not PA. Modest size UK room. 3m listening distance or so

If you are referring to SPL, I agree that 111dB/1m is a bit limited for PA. For a small solo singer/guitarist in a cafe it’s perhaps ok.

For home hifi, single unit just meets THX/Atmos spec for 85dB at -20dBFS @2m

For larger spaces and listening at 8+ metres, an extra 10dB would be welcome.

I can start to see why PA line arrays have supplanted point sources for large venues Eg. Stadiums

 

[jimk04]

I opened up the holes in the H225 a little to ease fitment. The PCD is 0.5mm different between horn and DFM and there isn't much clearance in the holes.

Can I ask what is the orientation of the horn assuming we want more horizontal than vertical dispersion.


Hope it's easy to see from the images.

 

[GM]

F6- terminus/mouth/baffle size:

F6- = 10^6/(baffle*wall angle) inches

F6- = (2.54*10^6)/(baffle*wall angle) cm

The higher the aspect ratio (taller) the wider its horizontal polar response and vice versa.

 

[Mitch311]

@tktran303 Do you think the HS250 horn would provide a similar response and/or better loading?

 

[tktran303]

DFM2535 in H250:

 

[vineethkumar01]

@tktran303: Are these H250 measurements made with horn on infinite baffle or in a cabinet with rounded edges around the horn?

I was just curious about if the dips in the 1.5kHz region are due to the waveguide 'termination' issue or something else..

 

[tktran303]

Free standing

ie. CD screwed to horn and then horn placed on turntable to take measurements.

 

[Mitch311]

The H225 (top) is so much better than the H250 (bottom)!
Kind of crazy actually. It would have been nice if the 250 was the same , but bigger.
Thank s for measuring and sharing TK.