Open Baffled 3.5 TMMW or MTMW?

Emiel · 14th March 2006, 08:30 PM

Hi all,

I've been reading some threads about open baffled speakers and now I can no longer control the urge to design and build one myself.

I'm thinking of a 2.5 design on an open baffle with two 5" midbass units and a tweeter. One midbass will be crossed at appr. 4500Hz to the tweeter with a first order series crossover (I've heard plenty of good things about this XO, and I figured this would be a good time to try).
The second midbass will kick in below appr. 400Hz to compensate for baffle losses.

The whole will be actively crossed to a woofer in a sealed cabinet at the bottom of the baffle.

The main concern I still have is the arrangement of the mid-high section. Can someone help me out with the pro's and cons of the MTM and TMM arrangements? Maybe some other comments before I start building?

Thanks in advance,

Emiel

infinia · 14th March 2006, 08:46 PM

Hi
I vote for MMT since the crossover is not symetric.
Try it both ways with out fancy crossover first.
Easy right.
I thought MTM was best for a long time, but I have a little doubt now.

sreten · 15th March 2006, 02:20 PM

As your discussing a 2.5 way then the issues are really
normal woofer tweeter on top compared to inverted.

MTM vs TMM is usually 2 way vs 2.5 way issues.

/sreten.

Emiel · 15th March 2006, 09:13 PM

Thanks for the answers!

Quote:

Originally posted by infinia
Hi
I vote for MMT since the crossover is not symetric.
Try it both ways with out fancy crossover first.
Easy right.
I thought MTM was best for a long time, but I have a little doubt now.

Why do you have doubts now? Can you hear differences?

Quote:

Originally posted by sreten
As your discussing a 2.5 way then the issues are really
normal woofer tweeter on top compared to inverted.

MTM vs TMM is usually 2 way vs 2.5 way issues.

/sreten.

I was just checking some loudspeaker kits, and indeed a 2 way is almost always configured as MTM and a 2.5 way as TMM.

Maybe somebody knows some info on the web on the differences between MTM and TMM?

darkfenriz · 15th March 2006, 09:25 PM

Quote:

MTM and TMM

What is it?

Emiel · 16th March 2006, 05:09 AM

It's about the tweeter/midbass arrangement:
MTM = From top to bottom: Midbass / Tweeter / Midbass
TMM = From top to bottom: Tweeter / Midbass / Midbass

14th March 2006, 08:30 PM	#1
Emiel diyAudio Member Join Date: Sep 2003 Location: Somewhere near Enschede	Open Baffled 3.5 TMMW or MTMW? Hi all, I've been reading some threads about open baffled speakers and now I can no longer control the urge to design and build one myself. I'm thinking of a 2.5 design on an open baffle with two 5" midbass units and a tweeter. One midbass will be crossed at appr. 4500Hz to the tweeter with a first order series crossover (I've heard plenty of good things about this XO, and I figured this would be a good time to try). The second midbass will kick in below appr. 400Hz to compensate for baffle losses. The whole will be actively crossed to a woofer in a sealed cabinet at the bottom of the baffle. The main concern I still have is the arrangement of the mid-high section. Can someone help me out with the pro's and cons of the MTM and TMM arrangements? Maybe some other comments before I start building? Thanks in advance, Emiel

14th March 2006, 08:46 PM	#2
infinia diyAudio Member Join Date: May 2005 Location: Californication	Hi I vote for MMT since the crossover is not symetric. Try it both ways with out fancy crossover first. Easy right. I thought MTM was best for a long time, but I have a little doubt now. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

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15th March 2006, 02:20 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	As your discussing a 2.5 way then the issues are really normal woofer tweeter on top compared to inverted. MTM vs TMM is usually 2 way vs 2.5 way issues. /sreten.

16th March 2006, 05:09 AM	#6
Emiel diyAudio Member Join Date: Sep 2003 Location: Somewhere near Enschede	It's about the tweeter/midbass arrangement: MTM = From top to bottom: Midbass / Tweeter / Midbass TMM = From top to bottom: Tweeter / Midbass / Midbass

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