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The Crawler, A Floor joist horn build - Page 2

post #31 of 49
Thread Starter 
Quote:
Originally Posted by JackNC View Post

I wouldn't want to have your back or knees after building that in a crawl space!

Most of the build I was on my back with not enough room to get on my knees so they faired OK. whats sore are my hands from squeezing out 54 tubes of cold(maybe 40F) glue. went to play my guitar and , ouch..........
post #32 of 49
What exact features and power level would an ideal amplifier for your build,..are you looking for?
post #33 of 49
Thread Starter 
Ideally, two channels, clean s/n> 100db, gain control, seems like 50 watts a side should be plenty. and flat to 10Hz
post #34 of 49
Just to add my two cents, I've got a pair of class d audio amps. 60 watts a channel I use them to drive my large two ways which are actively crossed over. They are great amps. Just wanted to put a positive word in for them... since no one else has. They have plenty of detail, and power, with out ever being edgy. However I'm not sure how much of that matters since you are just looking for something to power your subs. I just wanted to put a good word in for them.
Joe
post #35 of 49
Thread Starter 
The Class D Dayton DTA-100 that I am currently using is working great. It sounds really good in the near open field with the gain at almost 2/3.
post #36 of 49
COOL build...

i SO want to do this....
post #37 of 49
Thread Starter 
Quote:
Originally Posted by josephjcole View Post

Just to add my two cents, I've got a pair of class d audio amps. 60 watts a channel I use them to drive my large two ways which are actively crossed over. They are great amps. Just wanted to put a positive word in for them... since no one else has. They have plenty of detail, and power, with out ever being edgy. However I'm not sure how much of that matters since you are just looking for something to power your subs. I just wanted to put a good word in for them.
Joe

I think it matters alot for a horn
post #38 of 49
Check the bay, there are quite a few used power amps ~100-150 wpc, you can pick up used for $150. QSC for example.
post #39 of 49
Quote:
Originally Posted by Cortga View Post

Most of the build I was on my back with not enough room to get on my knees so they faired OK. whats sore are my hands from squeezing out 54 tubes of cold(maybe 40F) glue. went to play my guitar and , ouch..........

54 tubes, ouch! well, no pain no gain - its more than a cliche! I think it will be more satisfying to you having built it yourself and you saved a boatload of money.

I've got a crawl space under my family room but I'm going the small sealed route to save my back, hands and knees for what remains of my athletic (ice hockey) career.

Jack
post #40 of 49
If I never go into a crawl space again it'll be too soon. I installed 1000' of radiant heat pipe under my ex-house. What an awful summer that was. Awesome sub build!
post #41 of 49
Thread Starter 
I hate crawl spaces myself. But physicked myself up for this one because of the benefit, So stealth, accurate bass and hopefully a memorable couch ride or two. Got to beat a harley. I think it was way easier on my back than a sealed box would have been. Heaviest part of this one was the motor box at ~100 lbs and it is'nt ever going to move again. Took only ~60 hours to build cause 1/2 the horn was already built. The OSB cuts like butter with a skill saw 3 sheets at a time.

Was blown away today when I stopped by at lunch the framers were listening to Cinderella, and had it cranked, sounded really clean. I crawled under the house around the motor box and it was quiet, cool, no leaks. and I look at what's driving it, just way more than I expected.
Pete if you feel like taking a drive up to Los Alamos to check it out send me a PM.
post #42 of 49
I'll take you up on that one! I work in Santa Fe so it's a quick trip up there.
post #43 of 49
Thread Starter 
I stuffed the floor with R-22 rocksil this weekend and went ahead and squeezed the last six tubes of glue attaching various osb scraps in strategic locations.
I got that Dayon 150 watt amp, running the drivers in series with 150 sounds a little better than the 2-channel dta-100 but not much.
A friend gave me a pipe organ CD, wow, I am hooked, never heard that last octave on a recording before. The open field sounds good, can't wait to do in room measurements. I really don't like crawlspaces.
Attachment 234367
LL
post #44 of 49
Lookin good Cort.

What was the CD?
post #45 of 49
Thread Starter 
Quote:
Originally Posted by mwmkravchenko View Post

Lookin good Cort.

What was the CD?

Thanks Mark, Sorry, It is peter ??? a pipe organ from Ireland, I'll check next time I am over at the house.
I was going to ask you again for recommendations, I promptly lost the piece of paper where I wrote the one you gave me.
post #46 of 49
Send me a P.M. I send you some barn burners
post #47 of 49
Thread Starter 
Finally got to make some measurements.
Near field measurement. The red line is with Audyssey on, Blue with audyssey off. 1/3 octave smooting.

Actually came out a little better than the model.

For completeness,

I had the horn sprayed with a few inches of polyurethane foam.



Currently using Class D audio sds-254 to drive the horn in parallel. with an integra 80.2 and an emotiva UPA-5 for the others speakers.



Here you can see the mouth of the horn under the couch. The LRC speakers are all mini statements. build documented here: http://www.htguide.com/forum/showthread.php4?t=37837&highlight=cort
Monitor is a samsung 55.


For surronds I buit a pair of Jed's R44's in trapazoidal form to hang under the bar.
post #48 of 49
Cool pics, nice space and I love all the natural light.

I really dig seeing various types of normal, non-dedicated rooms, and the manner in which they're used for audio.

Also, this entire idea, the floor joist horn sub, is so cool and unique. The exit being where it is is fascinating as well, reminds me of the mammoth under-floor horn sub that Italian dude built. Anyway, I'm interested in your impressions with playback.

Just a friendly suggestion, with my previous set-up config, I had all three LCRs across the front, above my 60" display, all at the same height and toed in and angled down to the primary LP. This placed them up closer to the ceiling, just about the same height as your center. The energy reflected easily smears details, in a frequency dependent manner.

Oftentimes, the ceiling isn't considered for treatment, and simple panels can help significantly. With my LCRs, their performance was very much improved with a single absorption panel placed at the reflection point in front of each one of them. This really helped clarity, with zero negative impact to immersiveness/spaciousness (that may occur with excessive sidewall treatment).

Due to the proximity of theceiling, and since the angle is so slight, grazing angle and overall effectiveness need some consideration. A simple trick I did was move the panel a little farther away so a good bit of the MF/HF energy "sees" the panel edge as well as the main bottom side.

Sorry for the OT,but I've removed and reinstalled my absorption treatments so much, in various experimentation and measuring. Their impact never ceases to amaze me.

Thanks for the update and sharing the pics, I was wondering whatever became of this.

Good luck
post #49 of 49
Thread Starter 
It was a busy year.
The horn sounds great, very clean and crisp, seamless with the rest of the system. not intrusive at all musically it puts out the. 16 hz b from a pipe organ as I remember it live.
For movies I am amazed at the smoothness of the transition from what you can hear to what you can feel. With the couch over the mouth quite a bit of LFE is transmitted.
My only complaint is that it wakes me up rather abruptly when I fall asleep on the couch.

Thanks for your input on he center channel and the ceiling, It is the weak link in the system right now and my primary motivation to get REW up and running. I was going to tilt it farther forward, if that doesn't help then move down to below the monitor. Had not thought about ceiling treatment. Thanks.
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