THT placement. Just pulled it out of retirement!

[Comatoast]

If it ain't broken don't try to fix it. My TT and 75 watt plate amp are 20 years old, and they operate at least 8 hours a day.

Ha, point taken!!

I just wanted as more curious if over the years a better ( more capable ) driver / amp was available , just to get the most out of the actual enclosure

The amp I don't see being as drastic , other than maybe having a DSP as not much power is used

The driver on the other hand I guessed might have room for improvement?

Lavoce, eminence, or even the Dayton um15 all seem like more capable drivers, but I also realize there was a reason you recommended the driver I have, 12+ years ago when I built it..

[Bill Fitzmaurice]

Lavoce, eminence, or even the Dayton um15 all seem like more capable drivers, but I also realize there was a reason you recommended the driver I have, 12+ years ago when I built it..

Direct radiator subs use expensive drivers because they have to. Horn subs use inexpensive drivers because they can.

[Comatoast]

Lavoce, eminence, or even the Dayton um15 all seem like more capable drivers, but I also realize there was a reason you recommended the driver I have, 12+ years ago when I built it..

Direct radiator subs use expensive drivers because they have to. Horn subs use inexpensive drivers because they can.

I figured it was that... Doesn't hurt to ask

So if I wanted to DIY another sub , is there anything that outdoors the THT in every way? It's already enough as it is , but curiosity is getting the better of me

[Bill Fitzmaurice]

Anything can be bettered, at the cost of size. A no holds barred horn loaded sub flat to 17Hz with 110dB sensitivity is around 250 cubic feet, give or take.

[Comatoast]

Anything can be bettered, at the cost of size. A no holds barred horn loaded sub flat to 17Hz with 110dB sensitivity is around 250 cubic feet, give or take.

My curiosity ran out at 250 cubic feet..


So as someone who knew this very well in the past, not really paying much attention to the do's and don'ts for the THT and the limits, do you have cliff notes for the limits of the tht, where should the " safe zone " voltage be, and what are the limits?

Amazing sub, and completely destroyed my HSU vtf3 mk5 in every way, for 1/2 the price, but I'm guessing like anything. A near reference demo from the EoT opening credits will have me asking for new drivers real quick lol

[Bill Fitzmaurice]

If you have the ability to limit it should be 35v with 28Hz high passing. The limit isn't mentioned in the plans as almost no one other than pros have limiters.

[Comatoast]

If you have the ability to limit it should be 35v with 28Hz high passing. The limit isn't mentioned in the plans as almost no one other than pros have limiters.

So 35 volts is the limit

I recall seeing / remembering 28 volts until 22 hz? Is that still valid?

Obviously for 90% of music 28hz and above is all you'll ever need, but when I watching movies where explosions/scenes frequently dip into the low 20s and even teens. So other than constantly keeping a dmm on n the sub, or just setting it safe , I just wanted to touch base again to make sure

[Bill Fitzmaurice]

Every driver is different. As far as setting it safe, the only way to do that is with a limiter. However, at only 12v the THT is above 120dB, so I wouldn't be concerned.

[Rich4349]

A no holds barred horn loaded sub flat to 17Hz with 110dB sensitivity is around 250 cubic feet, give or take.

There you go, teasing us again! 2' x 20' x 6.5'

Sounds about right for a raised dance floor! Would one 3015LF be sufficient? Design it in ~5 chunks, which could be latched together with compression latches and foam weather stripping?

[Comatoast]

Every driver is different. As far as setting it safe, the only way to do that is with a limiter. However, at only 12v the THT is above 120dB, so I wouldn't be concerned.

Well since I'm in the same room as the man himself....


Please don't mind the mess, were in the process of new furniture, and still debating what to do with the tht...

So listening to a lil music... So you're basically saying I can go up nearly 20 volts from this, and still be ok?

I'm shocked as it's insanely loud and chest punch like crazy at 15 volts or whatever it was


Also... The trim on my avr ( Onkyo 686 ) is at +2 which is normal for YouTube music , as when I'm watching movies ,it's around -6....

But the amp level seems a bit high for putty out such low voltage to the sub..

This looks ok, or should I try to find a certain setting in my avr?

https://youtu.be/oWHxRdHsldA?feature=shared

[Comatoast]

In the listening space, place the sub in the location it would be coming through the wall, mouth aimed at the wall, about about a foot away from the wall. If it produces acceptable response throughout the low frequencies at your primary listening position, it's likely to produce very similar results with the sub mounted in the wall there. Do you have any testing equipment, REW? That can really take a lot of guesswork and subjectiveness out of the process.

One question I did have.. how would firing at the wall (technically corner loading , no? ), be the same as the sub (mouth ) be firing into an open area?

[Bill Fitzmaurice]

Allison Effect. https://billfitzmaurice.info/forum/viewtopic.php?t=398

[Seth]

One question I did have.. how would firing at the wall (technically corner loading , no? ), be the same as the sub (mouth ) be firing into an open area?

Soundwaves reflected off a surface from a source that's placed very near the reflecting surface propagate throughout a room very similarly to soundwaves originating from the reflected surface (aka speaker in the wall)... creating very similar peaks and nulls throughout the room. Not perfect, but very close... similar to how shining a flashlight in a mirror is very similar to shining a flashlight from the position of the mirror.

Looking at your pics, I'd wonder how well it would sound if it fired from the same little nook area but turned 90º and firing through the wall into the little hallway to the right of the viewing screen. It looks as though that position would hide the cab pass through from view.

[Comatoast]

So here's where I'm at... I'd put the sub behind this wall, cut open the Sheetrock where the port mouth is, then seal everything up good.. and to cover the hole, I'd make a frame out of some 1x2 pine , then wrap it in some acoustic speaker fabric to clean it up and cover the hole...

Then the TV and speakers would go against that wall , ( sucks as the port will basically be firing into the back of the TV.. ) and the couch on the other wall. ( Where the tv is now....

Worth a shot, or does this have bad news written all over it ? Lol

[Bill Fitzmaurice]

You can test it by aiming the sub mouth at the wall from a foot away. It will give the same in room response as flush mounting in the wall. Once in the wall anything in front of it will have no effect on the sound. Fourteen foot wavelengths go around obstacles. But anything in front of it will probably vibrate.