8" wide MCM TruckTuba

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Bill Fitzmaurice
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Posts: 28620
Joined: Tue May 02, 2006 5:59 pm

Re: 8" wide MCM TruckTuba

#16 Post by Bill Fitzmaurice »

bassmonster wrote: I think (Bill will have to confirm) that the driver is close enough to the mouth that it behaves like a tapped horn
It's a rear loaded folded horn configuration. The TT is a bit different, as is a tapped horn.
I meant actually unbolting the driver, flipping it over, and bolting it back in with the magnet sticking out, not in. Would that make a difference?
A bit. I don't see any reason why you'd want to do that.

SeisTres
Posts: 2689
Joined: Fri Apr 24, 2009 3:53 am
Location: Dallas, tx

Re: 8" wide MCM TruckTuba

#17 Post by SeisTres »

tomlang wrote:I meant actually unbolting the driver, flipping it over, and bolting it back in with the magnet sticking out, not in. Would that make a difference?
What you're essentially doing when you do this is giving it 180 degree phase shift and increasing the volume the chamber as the part sticking in takes up volume. However, this is the theory, the physical results have more nuances to them.

There's a design where you can actually use two drivers face to face (wired 180 out of shift) where one would think you would get 2x of what the single is doing, but the response changes so it's not as simple as 1+1=2. But all this can be modeled so it's not guesswork.

EDIT: almost forgot to ask is this designed wired with a reverse polarity? Or does it still keep the normal wiring of all the other designs?
Built:6 t39, t18, 4 Jack10, 2 autotuba, 2 SLA,2 wedge, 2 TT, 2 Tritrix, curved sla, 2 otop212, 2 SLA pros, Ported 8" sub, 2 ported 210, dual ported 8" sub

jimbo7
Posts: 849
Joined: Fri Dec 28, 2012 10:45 am
Location: St. Louis

Re: 8" wide MCM TruckTuba

#18 Post by jimbo7 »

SeisTres wrote:
tomlang wrote:There's a design where you can actually use two drivers face to face (wired 180 out of shift)
Its called isobaric. I believe its to squeeze more power out of a smaller box.
Only seen them at car audio shows
BFM builds:
XF212
T24 BP102 24"
2x SLA's 6-5" mids, 9- gt-302's
2x AT 14" MCM 55-2421
TrT 5" MCM 55-2421
AT 18" JBL GTO804
2x OT12 flat array
2x SLA Pro 2-Alpha 6's 2-Goldwoods
2x T39 24" 3012lf
Simplex 10 BP102

CoronaOperator
Posts: 1648
Joined: Wed Mar 25, 2009 7:07 pm
Location: Medicine Hat, Alberta, Canada

Re: 8" wide MCM TruckTuba

#19 Post by CoronaOperator »

jimbo7 wrote:
SeisTres wrote:
tomlang wrote:There's a design where you can actually use two drivers face to face (wired 180 out of shift)
Its called isobaric. I believe its to squeeze more power out of a smaller box.
Only seen them at car audio shows
You have more power handling but x-max and therefore Vd doesn't change. The biggest advantage is that the box can be made 1/2 the size at the expense of twice the cost and weight. In car audio, space is in usually shorter supply than money. Top competitors are also sponsored (free drivers) and if they use twice the drivers for their car to win then all the masses aspire to copy that design (increased sales).
Built:
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience

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