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Multi-Way Conventional loudspeakers with crossovers

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Old 3rd October 2013, 12:39 PM   #11
ODougbo is offline ODougbo  United States
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Oh yeah, they work and are in great shape; have plenty of extra's also.
I'll get on the baffle dimensions.

Thanks for jumping in!

The second part of this is that I just put three of the speakers (post #6) in my HT, really nice; never, never, had chair/room vibrate from mid bass - until now. But not the intention of the post.
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Old 3rd October 2013, 01:49 PM   #12
ODougbo is offline ODougbo  United States
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This is the baffle -
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File Type: jpg 2 ports.jpg (22.5 KB, 193 views)
File Type: jpg Size.JPG (314.0 KB, 192 views)
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Old 3rd October 2013, 07:39 PM   #13
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Just a minor side point, but you realize the Horizontal MTM is a flawed design. Vertical MTM is fine.

Given what I see in the photos, I think three Vertical MTM make more sense than two vertical and one horizontal.

Next, it is no wonder the speakers sound like ...(not good)... they are on the floor.

Raise them up the best you can, then angle them upward so they are point at the listener.

Even with Vertical MTM, placing them on the floors is less than ideal. Put them on plinths are raise them up to the extent that the circumstance will allow. If possible, depending on the listening distance, perhaps even angle them upward slightly.

As others have indicated, while not shown in the photo, are Subwoofers involved in this system. Because that is where the weight and impact will come from.

In my opinion, the real problem is that the screen is too big. A wise person accommodates the screen to a good set of speakers, not the speakers to the screen.

But then, that's just my opinion.

Steve/bluewizard
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Old 3rd October 2013, 08:03 PM   #14
Salas is online now Salas  Greece
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Quote:
Originally Posted by ODougbo View Post
Maybe someone can make a xo point suggestion?

3,000hz or above?

Attachment 374531
2.5kHz 3rd order acoustic for both ways, in 2way MTM config.
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Old 3rd October 2013, 08:30 PM   #15
ODougbo is offline ODougbo  United States
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Well there is that dip around 2,500, didn't know if that is an issue or not.

Had a set of these: http://www.madisound.com/store/manuals/HDS_xover.pdf
Always though they sounded nice, but the low xo point didn't work with a XT25 & 6.5" woofer experiment.

*
Yes the stands; they have "column" stands, just not shown.
What about the two vertical and horizontal center under screen, that's what everybody does.

*
Did some cutting today
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Old 4th October 2013, 12:03 AM   #16
Dissi is offline Dissi  Switzerland
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The XT25 is really tricky in crossover design. Every time I try, all attempts to get a decent frequency response using a classic 2nd or 3rd order high-pass filter fail, great.

Fortunately 4th order works very well. Disadvantage is the additional inductor needed, but it provides the conditions for the tweeter to perform at its best.
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File Type: jpg SimulationODougboPeerlessMTM.jpg (119.6 KB, 162 views)
File Type: jpg CrossoverODougboPeerlessMTM.jpg (68.4 KB, 111 views)
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Old 4th October 2013, 12:06 AM   #17
Salas is online now Salas  Greece
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Quote:
Originally Posted by ODougbo View Post
Well there is that dip around 2,500, didn't know if that is an issue or not.
Integrate the dip to the overall shaping. It takes on and off axis response data of of the drivers mounted on the final box, a calibrated mic, FFT, and CAD to do any real crossover job properly. Then subjective evaluation that could lead to significant changes or to just small tuning sessions.
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Old 4th October 2013, 12:16 AM   #18
Salas is online now Salas  Greece
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Quote:
Originally Posted by Dissi View Post
The XT25 is really tricky in crossover design. Every time I try, all attempts to get a decent frequency response using a classic 2nd or 3rd order high-pass filter fail, great.

Fortunately 4th order works very well. Disadvantage is the additional inductor needed, but it provides the conditions for the tweeter to perform at its best.
It looks like the sim includes 3dB baffle step correction?
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Old 4th October 2013, 12:39 AM   #19
Dissi is offline Dissi  Switzerland
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Full baffle step correction (simulation of frequency response in anechoic chamber).

It is -6 dB at 20 Hz. But you are right, in the range between 100 Hz and 1 kHz the resulting SPL is only 3 dB lower than in the datasheet (infinite baffle). Did you mean that?

Last edited by Dissi; 4th October 2013 at 12:53 AM.
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Old 4th October 2013, 01:17 AM   #20
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Yes.
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