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The Eminence 20Hz Tapped Horn

After reading this thread I was wondering if I could use one of two 15″ I had left over from the Klipschorn. After some back and forth, an obsolete Eminence type EPS15-500 (Xmax 6,4mm) looked most promising. Even though the Xmax is limited I gave the following simulation a try (Note: as a direct replacement you can also use the current Eminence Kappalite 3015LF (Xmax 9,6mm), Eminence DEFINIMAX 4015LF (Xmax 9,0mm) or the MTX Audio T7515-04 (Xmax 16,5mm). Many others will work as well – just give them a try with hornresp).

The predicted response:

EPS15-500_v3_SPL

The parameters of the simulation:

EPS15-500_v3_PAR

The excursion simulation:

EPS15-500_v3_EXC

Regarding the room gain I like the idea of EQing the response down and gain some headroom.

The Eminence I’m using will reach Xmax with only a little above 15V @ 20Hz (115dB should be fine anyways).

This gives you an overview on the folding:

th_v1

And this is what it looks like during building:

TH_innen_1

Except the inner bracing, which were 16mm, the thing is made from 22mm MDF. All connections are glued and screwed. It took me a weekend to build it.

TH_innen_2

Here is the baffle cutout for the 15″ speaker.

TH_innen_3

This is before sanding:

TH_zugeschraubt

This is my old Eminence EPS15-500 in place. As I pointed out, the Kappalite 15LF will fit also (very similar response, more max SPL due to higher xmax – 9,6mm insted of 6.2mm).

TH_speaker

When I brought it into my room first, I thought: Oh my god, this thing is big.

TH_liegend

Here it is in my room. After errecting it in the corner it still looks large but not as bad as before, when it was laying in the middle of the rool. Paint will be applied in spring and of course, If I still like it then. The mouth points toward the left hand side.

TH_aufgestellt

In the evening I did some testing. I heard some music and watched a movie. It sounds very effortless and goes deep down. Great for HT and music.

I also made a less tall version of the TH (230 vs. 244cm). Low end is just a little compromised. Here is the comparison of predicted responses:

EPS15-500_v3_SPL_230_vs_244cm

Plans can be found in the download section.