Infinite baffle into garage? or ceiling? (1 Viewer)

[Jesse Sharrow]

I have just aquired two 15" Dunlavy audio subs, and 2 10" Dunlavy audio subs. I have the specs on the 10's but not the 15's. But it sounds to me like you dont need to worry about specs on the sub when you are doing infinite baffle. But I guess the driver itself has to be designed for it????? Well anyways. I may sell those and get something different anyways.

But my question is, I have a room with a vaulted ceiling. The other problem is the only wall I could do an IB in goes out to the garage. Now how would that work? Is it possible to do in this room? The only other place I can think of is one wall is about 6-7' off the ground with an opening directly below it. But that wall goes into my bedroom upstairs. So is an IB even feesable in this house?



The wall on the left goes out to the garage. The full length.



This is the wall Im talking about that goes up to my bedroom.

 

[Jesse Sharrow]

Whoops! I forgot to ask about the ceiling. The vaulted ceiling has room in it to do an IB. Would that work?

 

[ThomasW]

I'd sell the 15" subs and use the proceeds to finance the purchase of other woofers with known T/S parameters.

Garages for the rear wave work fine. You'll find a couple of them listed in the "Cult" IB photo gallery. Note that they look like any other design, so you'll need to read the text to be sure

BTW, if you have occasion to be up in Denver, drop by and audition my pair of IB's. My small IB is in a room with vaulted ceilings no problem.

 

[Jesse Sharrow]

Ok cool. Maybe I will do that then. Thanks for the help.

 

[Jesse Sharrow]

Im sorry. One of my first questions didnt get answered.

Do I need to know the thiele small parameters on the 15's to use them for infinite baffle?

 

[ThomasW]

It would be handy to know the Xmax, Fs, efficiency. Some pictures would be helpful.

I seriously doubt that these have high enough excursion for just 2 drivers to work in an IB configuration. Dunlavy certainly made great speakers, but the company went under long before the current generation of high excursion drivers existed.

The drivers would probably be worth a bunch to people having Dunlavy subs and needing or wanting replacement drivers. So listing them on audiogon or ebay could net a nice profit

 

[Jesse Sharrow]

Well dunlavy, as of about a week ago is offically gone. So the technology is pretty new.








I also have a pair of 10's that I have all the specs on. I was going to just build a sealed sub for those. I didnt think they would work well in an IB.

But heres pics of those.






So you guys let me know what would work best. Thanks again.

 

[ThomasW]

The design of the 15"s is dated (1990's technology). They are a standard pulp cone, less than 10mm of Xmax and a relatively small magnet. They wouldn't last long in an IB, they'll bottom out with any big bass transients. Probably best used in a ported box given the short Xmax

What's interesting are the 10"s (are you sure they aren't actually closer to an 11"?) are a much newer technology (about 2001 or newer). 12 spoke cast 'aero' basket, nice big magnet, fat surround, big dust cap to stiffen the cone, and the cone itself is treated.

Both the drivers look like products made by Eminence.

 

[Jesse Sharrow]

Well then would the 10's be ok in an IB??

These are all the specs I have on the 10's.

Rmin=64-68hz
Fs=78.58 In2
Vas=3.968 ft3
Qts=.565
Qes=.634
Qms=5.22
Re=5.29Ohms
Rm=48.86Ohms
Le=1.47mH
Eff=85.2db 1w/1m
Bl=13.61Tm
mm=5.417oz
Rmin=6.09@64-68Hz
Rmax=78.43@23Hz

 

[ThomasW]

Only if the listening room were the size of a small closet.

There's a fairly comprehensive FAQ page link the "Cult" forum, you might want to read it. Also there are links to gallery pages showing dozens of IB installations. Those should give you some idea of the size and number of drivers needed for an IB

 

[ScottDIY]

That "10inch" looks exactly like a DPL12.

 

[Jesse Sharrow]

Yeah it does doesnt it. Well I think I may just sell all of the subs and get 2 15's or 18's for an IB setup.

 

[Jesse Sharrow]

BTW thanks for the help guys. And I appreciate your paitence.

 

[Bryan Michael]

thomasW once i get my ib finished if you want you can post pics of it.

 

[RickVS]

I got the T-S parameters for your 15" Dunlavy woofer, and if you are thinking about doing an infinite baffle speaker, this is definately the one. Despite its lackluster appearance, that thing is incredible in infinite baffle. I tried many different box configurations, but nothing does these things justice like IB. I don't know what Dunlavy did to stick it in the SCVI!!! But the bigger the box you stick these things in the lower the f3 and smoother the curve. I was seeing about 18Hz f3 in infinite baffle, and I know these things have exceptionally low THD.

05-RE OHMS 5.98 13-FS HZ 19.48
06-LE MH 1.75 14-MMS GMS 131.96
07-QM 14.65 15-CMS mm/N .5059
08-QE .780 16-RMS NS/M 1.1027
09-QT .740 17-VAS LTRS 521.00
10-XMAX MM 9.10 18-SD SCM 856.34
11-BL TM 11.16 19-EBP 25.1
12-EFF % .48 20-SPL dB 88.8

 

[RickVS]

That didn't look too good, here you go again:
05-RE OHMS 5.98
06-LE MH 1.75
07-QM 14.65
08-QE 0.78
09-QT 0.74
10-XMAX MM 9.1
11-BL TM 11.16
12-EFF % 0.48
13-FS HZ 19.48
14-MMS GMS 131.96
15-CMS mm/N 0.5059
16-RMS NS/M 1.1027
17-VAS LTRS 521
18-SD SCM 856.34
19-EBP 25.1
20-SPL dB 88.8