15" tapped horn with RCF

[wood1y]

Hi all!
I'm sharing here with you my tapped horn i’ve 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.





Excursion powered with 800W


Than i designed a cab for it:


..and started making sawdust:




done...


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

The unprocessed response:


..and processed with a DSP:
HPF: 30 hz, 48db/o (for the speaker protection)
LPF: 200 hz, 48db/o
EQ: 200hz, -4db, Q1


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]

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]

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

[wood1y]

THX

Originally Posted by Dr.EM

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.



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]

Nice job - looks great

[Xoc1]

Compliments on a sucessful project.
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]

Nice work!

[iand]

Originally Posted by chris661

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]

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]

Originally Posted by David_Web

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