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Multi-Way Conventional loudspeakers with crossovers

Morel cat378 plus rs180p........
Morel cat378 plus rs180p........
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Old 4th August 2017, 08:51 PM   #1
norman bates is offline norman bates  United States
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Default Morel cat378 plus rs180p........

Gowa has, anyone else ?

I've been looking closely at curt's slapshot, using morel and 2 rs180p drivers, 6db tweet, 12db for woofs.

https://rhythmaudiodesign.com/collec...it-plans-mtm-1

Maybe even a tmm for under tv (I'm not keen on mtm used wide), that get tweet closer to tv screen.

Norman
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Old 5th August 2017, 04:10 AM   #2
freddi is offline freddi  United States
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Morel cat378 plus rs180p........
- nice report on vocals
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Old 5th August 2017, 09:44 PM   #3
GOWA is offline GOWA  Canada
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I'm not getting your question. Are you asking if the crossover will work as a TMM? If so, no.
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Old 6th August 2017, 05:59 AM   #4
norman bates is offline norman bates  United States
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Why not ?

True mtm would cross at total size, ie 2x6.5" with 7" frame with no tweeter should cross where a 14" across driver narrows, like 1khz.

Odougbo tried both mtm vs tmm and found no difference.

Norman
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Old 6th August 2017, 05:58 PM   #5
GOWA is offline GOWA  Canada
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MTM centers are indeed a compromise as most want to limit the height of the speaker. All MTM’s will not be optimum when utilized as centers unless they were specifically designed to do so, such as the Slapshot. There is little compromise using the Slapshot as a center unless one is sitting far off the lateral axis. This is true of course for any MTM center and worse for some than others. In my experience, the Slapshots will perform better off axis than many commercial MTM center channel designs, who seem to care little about fidelity.

If one has room for at vertical orientation on the center speaker the TMM certainly be acceptable, and of course will provide better lateral off axis response at the expense of some vertical axis issues, -although these are less important as the vertical listening angle range is generally less.

Due to driver placement on the front baffle, most MTM designs will require a slightly different crossover to be utilized in a TMM configuration. Of course this will depend on the design in question. No universal rule of thumb statement concerning making MTM’s into TMM’s or vice versa will apply in all cases. In some cases yes, in other cases, it will depend on how close to optimum you want the speaker to remain. They will all reproduce music, some with more aberrations than others. If one isn’t to concerned about absolute fidelity, one can certainly do as one pleases and live with the results.
If an MTM design was not well optimized initially, then there is a slim chance it might even sound better as a TMM. If this happens, one should immediately also purchase a lottery ticket. It would be a shame to let all that good fortune go to waste…
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Old 6th August 2017, 08:07 PM   #6
GOWA is offline GOWA  Canada
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have you looked at the Chinook TMM?
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Old 6th August 2017, 11:30 PM   #7
norman bates is offline norman bates  United States
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Chinook using a baffle step inductor ?

usually doesn't work too well with the increasing Z in a woofer.

I keep coming back to that morel, for years wanting to do something with it.

I'm more and more happy with the klipsch rb 75 I've been playing with (foam around horn mouth), I just suspect that I can have even less reflections with foam around the morel.

Slapshot (to me) is a risk as resale value is low and demand is even lower were I to build it.
But I suppose allowance needs to somewhere, right ?
We are on diyaudio..................

I'll read and chew on your post.

Last edited by norman bates; 6th August 2017 at 11:33 PM.
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Old 7th August 2017, 04:58 AM   #8
norman bates is offline norman bates  United States
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I don't see baffle step.

I wonder about making the cabinet 22" tall by 14" wide.
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Old 7th August 2017, 05:00 AM   #9
GOWA is offline GOWA  Canada
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You're best to talk with the designer.
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Old 10th August 2017, 04:38 AM   #10
norman bates is offline norman bates  United States
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the tweeter crossover seems bizarre.

A stock morel cat 378 has a bit of lift from 2khz-7khz due to the shallow horn loading.
They show a chart where they add a 5.6uF in series.
Morel CAT378 Horn Tweeter
Basically the Z is around 6ohms (somewhat), so the pole should be 4.7khz, but the shallow horn loading makes the F6 at 2khz.

Now the slapshot design puts a 4.5ohm in series with a larger 8.2uF cap, making a pole of near 1.8khz.
To me the tweet would have a hump in the response.

Am I off base ?
crossovers aren't a strong suit for me.

Norman
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