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Sella 20th September 2012 01:35 PM

2-way using front loaded horn and (sub)woofers
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Hi all,

I am starting new a project utilizing horn loaded co-axial compression driver and cone drivers in sealed enclosure. Whole system will be active with DSP.

I have aquired Stereo Lab SL190 tractrix horn (fc = 190 Hz) and BMS 4592ND compression driver. Yes I am aware of HF-beaming issues using deep horn but this first version will be with just one horn.

I am still trying to figure out the low register. Traditionally people have used large dimension woofers (15+ in) to match the off-axis response at XO frequency. For aestetic reasons I want to use max 12 in drivers.

I plan to equalize the CD-horn combination all the around 350 Hz where horn off axis response is about -2dB at 90 deg (there is one resonance on the way, but with manageable with EQ). Then cross my 2x12" subwoofer section with steep slopes while radiation pattern is also wide (almost omnidirectional).

I am planning to use new Peerless XXLS12 subwoofers which should be ok to cross this high. With this kind of setup I could even use 10" drivers since we do not need the cone beaming at all to match polar response at XO?

Does this make any sense or have I gotten something grave wrong? I attached polar maps for the horn and for the driver to half-space.

Pano 20th September 2012 08:24 PM

Interesting question. As this type of system is usually done with a 15" woofer. I've heard it done with a 12", and don't remember any problems.

If that horn actually plays that low, it will be a surprise to me. I don't see a 58cm horn as loading a driver down to 190Hz. 400-500 Hz, maybe. The driver can do it, but can the horn? Please let us know what you find.

Sella 21st September 2012 07:45 AM

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I am going to try XO the horn from about 350 Hz. I was eyeballing this measurement of AH160 (fc = 160Hz) horn. The response starts to roll off around naturally around 250-300 Hz.

My biggest concern is to get power response without a dip at the XO frequency between woofers and the horn.

Speedysteve7 21st September 2012 07:26 PM

Interesting project.
I am reckoning to get 350Hz out of a similar horn but with JBL2482 2" throat comp drivers. They use a phenolic diaphragm.
They currently play down to 330Hz no problem in a 70cm length conical and sound good.
I just had to try a tractrix on them.
I pick up the horns tommorrow...

Oh, what DSP will you be using?

Sella 22nd September 2012 06:26 PM

I am going to use miniDSP 2x8 unit. I also have 8 channels of amplification, so I guess this project, strictly speaking, will be a 4-way solution :-)

Speedysteve7 22nd September 2012 09:42 PM

Even more interesting. I almost went miniDSP but decided to keep things analogue - have nice analogue source, so didn't fancy digitizing that.
I'll be very interested to hear how you get on - which slopes you end up using etc.
I still have not completely counted miniDSP out as the flexibility it offers is amazing...
The passive crossover part for my 5 way cost more than DSP would have done - so DSP is very tempting - esp if you change drivers / horns etc.

Sella 24th September 2012 11:34 AM

I will certanly keep posting as the project goes on.

I am still wondering could somebody with insight give opinion in marrying large horn to smallish subwoofer?

Sella 26th September 2012 06:49 PM

2 Attachment(s)
There is slight progress.

I decided to go with larger woofer, a 18 incher, as experienced Finnish speaker builder recommended. It apparently causes serious problems to integrate woofers to the horn with small cones.

I chose BMS 18S430 which goes for 280e/pcs here in Finland. I am planning to put it smallish 50-60l sealed box. Couple of quick renderings attached.

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