FI SP4 18" x4 Sonosub Build - AVS Forum
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post #1 of 40 Old 07-30-2014, 09:48 AM - Thread Starter
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FI SP4 18" x4 Sonosub Build

Not a lot of text since this build has been done for a while now. Any questions feel free to ask.

Arrival and un-boxing

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post #2 of 40 Old 07-30-2014, 09:48 AM - Thread Starter
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Cutting baffles....

Since these drivers weigh a lot I used plywood for the baffles. I didn't trust the MDF in a 3/4" form, and didn't want to double baffle everything.

The baffles are glued and stapled with large heavy gauge staples to keep them in place.

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post #3 of 40 Old 07-30-2014, 09:48 AM - Thread Starter
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Trim Rings-

The trim rings are 3/4" MDF. Two of the four enclosures are in the open so I wanted to do something that would put them on display yet still protect them.

I came up with a design that incorporated double trim rings, 2" dowel rods, and plexi glass.

On the top trim ring (the one that houses the plexi glass) I rabbted in a groove the depth equal the thickness of the plexi glass and 1/4" wider in diameter than the actual plexi cutouts.

I used the 1/4" gap as space for the adhesive which would hold the plexi in place. Turned out quite well.

The last two pics are test fits of the plexi in the top MDF ring.

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post #4 of 40 Old 07-30-2014, 09:49 AM - Thread Starter
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Plexi glass install and paint

I hate painting more than anything else, unless I have a sprayer then I don't seem to mind it.

This particular paint, Miller Acrynamel, is supposed to dry hard like an oil based paint. I used it on all my mill work in the theater room but for some reason it didn't lay down easily on these enclosures. I finally just said screw it for the two that are hidden behind false walls and focused on the two in the open. Turned out well in the end.

The plexi-glass install went nice and smooth. I used some E6100 and ended up having no need to 'tabs' to hold the plexi glass in place. The adhesive does a fine job by itself.

You can see that two of the enclosures are down firing and two are up firing. I don't know if this helps with modes or not since I didn't do any pre-measures but I don't think it can hurt.

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post #5 of 40 Old 07-30-2014, 09:49 AM - Thread Starter
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Finishing up

Like I said above I gave up on the two enclosures that are hidden behind false walls. I gave them a quick coat of flat black on the sonotube (not too much because it is cardboard and will swell if you over paint them) and put them in their corners.

For the two on display I used a vinyl wrap similar to what they make bras for cars out of. I then used a seam concealer at the seam. The only thing I would have done different is use an 1/8" thick piece of foam for a pre-wrap to go between the vinyl and the sonotube. It's really hard to see the sonotube lines, but you can see them if you look closely. The foam would have fixed that.

The two enclosures in the corners, below the mains, have OC703 on top to prevent any possible reflections.

The other two are just behind two of the chairs, above 5' back.

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post #6 of 40 Old 07-30-2014, 09:49 AM - Thread Starter
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ffffffffffffffffffffffffffff
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post #7 of 40 Old 07-30-2014, 10:02 AM
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The attachments are not working for me. I just ported my IB as well. I tuned it really low to boost the 5-12hz area and lose below 5hz. My signal chain started to drop anyways below 5hz so I am good to go. I have not listened to some bass heavy movies yet but I ran a 120 dB sweep by accident while EQing and it was crazy! I forgot to turn the gain down on my amp. My response is almost the same as it was sealed due to the low tune and signal chain.
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post #8 of 40 Old 07-30-2014, 01:18 PM
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Quote:
Originally Posted by pdxrealtor View Post
Does anybody know why is it limited at 47hz, amp clipping or mic clipping?
I thought it would run out of excursion between 10 to 20hz firstly.
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post #9 of 40 Old 07-30-2014, 03:39 PM
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post #10 of 40 Old 07-30-2014, 06:18 PM
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Nice job! So with the sonotube you don't have to add any bracing, just polyfill?
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post #11 of 40 Old 07-30-2014, 06:41 PM - Thread Starter
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Quote:
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Nice job! So with the sonotube you don't have to add any bracing, just polyfill?
Correct. Polyfill is an option too.

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post #12 of 40 Old 07-30-2014, 08:56 PM
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Quote:
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Correct. Polyfill is an option too.
How much does a sonotube weigh just by itself before adding anything?
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post #13 of 40 Old 07-30-2014, 10:49 PM - Thread Starter
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Quote:
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How much does a sonotube weigh just by itself before adding anything?

Not much.
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post #14 of 40 Old 07-30-2014, 10:57 PM
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Glad to see these getting more publicity. Awesome build again.
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post #16 of 40 Old 07-30-2014, 11:18 PM - Thread Starter
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^^ thx
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post #17 of 40 Old 07-30-2014, 11:20 PM - Thread Starter
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Quote:
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This.
The driver was audibly going to **** with every increase FWIW
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post #18 of 40 Old 07-30-2014, 11:21 PM
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The driver was audibly going to **** with every increase FWIW
Hm, maybe amp then. Doesn't look like driver compression. You'd be hitting xmax sooner at lower frequencies, so it's not travel related. Since the lines all overlay, and power compression wouldn't show like that, my guess is amp.
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post #19 of 40 Old 07-31-2014, 09:51 AM
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Nice, PDX! I've been waiting for this one to come about.

So are you saying you can definitely hear bad sound from the drivers, themselves?

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Nice, PDX! I've been waiting for this one to come about.

So are you saying you can definitely hear bad sound from the drivers, themselves?
amp clipping will sound ugly too
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post #21 of 40 Old 07-31-2014, 10:07 AM - Thread Starter
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^^ it sounded like a driver that was being pushed. Very well could have been the amp, it was only one channel of a Peavey though and I don't remember if DDT was lit up or not. I also don't remember if I had to stop because of the circuit breaker (in wall) or my own choice.

Now that I think about it the audible distress could have been gone by 40 hz.

The sweeps were from 0hz up and the most teeth gritting moments were the last couple of tests down low. You know when REW first starts cranking the tone?

At levels like that it reminds me of an old machine starting up. Slow and iffy until it gets moving...

It's been a while since I ran the test and I didn't take any notes or spend much time on it.

I do know the driver will travel a full 2" before the bottom spider to pole joint hits the top plate, and that has not happen in any test I've done since installed in their boxes.

No bad sounds from the drivers themselves.
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post #22 of 40 Old 07-31-2014, 10:09 AM
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amp clipping will sound ugly too
Oh of course. I wasn't sure if he meant that they drivers were making the bad noises.

Kinda surprised to see an IPR2-7500 clip at these levels.

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post #23 of 40 Old 07-31-2014, 10:23 AM - Thread Starter
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Quote:
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Oh of course. I wasn't sure if he meant that they drivers were making the bad noises.

Kinda surprised to see an IPR2-7500 clip at these levels.
I've been meaning to get the measuring mic out and run several tests now that my room is 110% done. Maybe I'll test the same driver again and make some notes.

The thing with the Peavey is it has the DDT protection that kicks in. Maybe it kicked in around ~ 40 hz. Again, I don't recall. Based on past experience at those levels the DDT should have been on from start to finish.

Almost 100% sure based off running other max spl sweeps that when running those my AVR had to have had sub trim maxed and volume past the '0' mark on those last two sweeps.

Scott - sit tight and I'll post a couple vids of the driver breaking in free air. They didn't seem noisy to me but maybe someone can weed through the obstacles of recorded sound and weigh in on noise. I didn't think they were noisy but I'm not free airing drivers often either.

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post #24 of 40 Old 07-31-2014, 10:32 AM
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Much less probably of noise running in the enclosure I would think unless there was some bad rattle in the cab. I'm sure you have looked into that too.

If I'm not mistaken the SP4 has a naturally low Re associated and that could put just that much more strain on the amp.


No worries. I'm sure you'll figure it out soon enough. Just glad to see someone use this particular driver as nobody seems to give em a shot. I've heard enough about the Q's and IB's.

Good luck, sir!

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post #25 of 40 Old 07-31-2014, 10:41 AM
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Should be mic or input clipping. Doubtful it is the amp. There will be higher impedance through the 40-60Hz range in that box so there is far less power and current demands from the amplifier in that range. Plus they will not clip into a perfectly flat line like that.
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post #26 of 40 Old 07-31-2014, 10:41 AM - Thread Starter
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post #27 of 40 Old 07-31-2014, 10:43 AM - Thread Starter
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^^ in one or both of the videos you can hear where I bottomed it out a couple times towards the end.

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post #28 of 40 Old 07-31-2014, 10:52 AM
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Quote:
Originally Posted by Ricci View Post
Should be mic or input clipping. Doubtful it is the amp. There will be higher impedance through the 40-60Hz range in that box so there is far less power and current demands from the amplifier in that range. Plus they will not clip into a perfectly flat line like that.
Exactly. Sounds like the consensus is that it is either the mic or input clipping. I guess these are the better of the 'bad things' here.

Maybe try a sub out trim from the AVR? If it's not the mic clipping anyway.

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^^ in one or both of the videos you can hear where I bottomed it out a couple times towards the end.
I'll check these out when I get home. No sound here at the office.

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post #29 of 40 Old 07-31-2014, 02:16 PM
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Hey Pdx, that's a sweet build. You make it look sooo easy.
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post #30 of 40 Old 07-31-2014, 10:47 PM - Thread Starter
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Thx ^^

When's your build thread going up?
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