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-   -   15" tapped horn with RCF (http://www.diyaudio.com/forums/subwoofers/170749-15-tapped-horn-rcf.html)

wood1y 24th July 2010 01:35 PM

15" tapped horn with RCF
 
Hi all!
I'm sharing here with you my tapped horn iíve recently finished.

First of all, thats not a th-115 copy.

It may look like the th-115, but i have never seen one in real yet, i dont know how it looks inside. All the calculations and woodwork are made by myself.

My goal was to build something goes down to 40 hz, and has more than 100 db/w/m sensitivity. I played around with hornresp and decided to use the RCF LF15 G401 in a 40 hz tapped horn.

http://img826.imageshack.us/img826/8072/dscf5797l.jpg

http://img204.imageshack.us/img204/6...lf15g4011w.jpg

Excursion powered with 800W
http://img819.imageshack.us/img819/1...15g401disp.jpg

Than i designed a cab for it:
http://img811.imageshack.us/img811/1082/83214983.jpg

..and started making sawdust:
http://img12.imageshack.us/img12/198/p1010191b.jpg
http://img525.imageshack.us/img525/5249/p1010193b.jpg
http://img267.imageshack.us/img267/5177/p1010198l.jpg

done...
http://img690.imageshack.us/img690/1351/dscf6118ml.jpg

And here are the measurings i did outside with 2,83 V from 1m distance.

The unprocessed response:
http://img837.imageshack.us/img837/9425/graph1.jpg

..and processed with a DSP:
HPF: 30 hz, 48db/o (for the speaker protection)
LPF: 200 hz, 48db/o
EQ: 200hz, -4db, Q1
http://img40.imageshack.us/img40/1521/graph2f.jpg

My goal has been achieved :)

We had the first "test" last weekend, a little electronic music party with 40-50 people in a middle sized room, and the result was astonishing. Incredibly deep bass, very loud and clean. It was driven by the T-AMP TA2400. I couldn't even drove it hard, bcause the whole building started falling apart. :)

(ps.: sorry for my poor english)

Dr_EM 24th July 2010 02:15 PM

Looks like a well executed project, very tidy :)

What is the black finish? Truck bed liner? It looks good for this sort of use.

Pano 24th July 2010 02:17 PM

I second that, bravo! Nice work. I bet those DO shake the house.

wood1y 24th July 2010 02:42 PM

THX :)

Quote:

Originally Posted by Dr.EM (Post 2252651)
What is the black finish? Truck bed liner? It looks good for this sort of use.

No... It is the Warnex textured lacquer... like this.

http://www.lautsprecher-technik.de/images/LM15_1_f.jpg

Its very hard, u cant sctratch it, is waterproof and it still looks good ... I think this is the best choice for PA boxes.

Oklahoma Wolf 24th July 2010 03:08 PM

Nice job - looks great :)

Xoc1 24th July 2010 03:57 PM

Compliments on a sucessful project.:cool:
I would very much like to see your input parameters for Hornresp.
Also I an very interested in the parallel horn section that is adjacent to the driver. I like how with that extra folded section you have managed to increase the length of the horn and not waste any internal space.

chris661 24th July 2010 04:31 PM

Nice work!

iand 24th July 2010 05:40 PM

Quote:

Originally Posted by chris661 (Post 2252748)
Nice work!

Going by the Hornresp plot I'd have said the LF15G410 was short of Xmax (8.5mm) for 800W handling -- there are numerous 15" drivers with similar T-S parameters but bigger Xmax (BMS, Ciare, Beyma, Faital Pro...) which would handle considerably more power.

Of course they could also be more expensive, or just not model as well in a tapped horn...

Ian

David_Web 24th July 2010 06:40 PM

Made two TH using the same driver. Worked out really well.

I have never run more than 400W peak RMS through it (limited with DCX2496) bumped it down to 200W as I really didn't need every light and ventilation to vibrate.

Mine where slightly higher tuned but are 233L external volume. 102-103dB 2,83V (around 1W) IIRC.

So I can imagine what yous can do.

iand 24th July 2010 10:39 PM

Quote:

Originally Posted by David_Web (Post 2252820)
Made two TH using the same driver. Worked out really well.

I have never run more than 400W peak RMS through it (limited with DCX2496) bumped it down to 200W as I really didn't need every light and ventilation to vibrate.

Mine where slightly higher tuned but are 233L external volume. 102-103dB 2,83V (around 1W) IIRC.

So I can imagine what yous can do.

At 400W the RCF driver would be fine.

If you follow the usual recommendation (for PA) of an amp with a power output of double the continuous driver rating (to allow for music crest factors) the BMS15N850 is the only 15" driver I've found that can handle anywhere near this without running out of Xmax (16mm using the usual formula).

Ian


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