MWM HF question

[Coytee]

As most know, the MWM's are ....shall I say, kind of wide.  Takes a wide room to fit them, especially if you want space for a center.

 

Brings my question....

 

Could you take the MWM, rotate it 90 degrees so it's laying on its edge rather than base.  Now it's only something like three feet wide rather than seven.

 

If you do that, what fits on top?  A K402 likely won't easily fit on top wedged between the top part and most traditional ceilings.

 

Could you instead, create some kind of mounting bracket, then mount the K510 in the center of the vertical speaker (to the front plate), much like a coaxial speaker?

 

I'm not saying mount the 510 INSIDE the front plate, it would mount on the outside of it.

 

Could that work for the 402 or is the 402 too large and interfere with some of the output of the bass bin?

 

 

[tromprof]

I do that with my side channel quarter pies (putting them on their sides). It works just fine sound wise, though their shape is a bit friendlier for this since their back has a 90 degree corner and they are not quiet as big as an MWM. As far as what goes on top, a smaller trachorn, or maybe the 402 but mounted on the side of the MWM.  Don't think I would want to put it inside, seems like it would muck things up.

Edited November 12, 2015 by tromprof

[Chris A]

Could you instead, create some kind of mounting bracket, then mount the K510 in the center of the vertical speaker (to the front plate), much like a coaxial speaker? I'm not saying mount the 510 INSIDE the front plate, it would mount on the outside of it.

 

Could that work for the 402 or is the 402 too large and interfere with some of the output of the bass bin?

 

Richard,

 

Note that the MWM bins will flip their coverage pattern if you turn them upright, and the bottom horn mouth will be loaded to a much greater degree using the floor.  If the upright MWM bins are the height of the room, then you have a good chance that both horn mouths are being loaded by the room to the same degree. If you move the upright MWM bins outwards to the corners of the room (still toed-in to match the toe-in of the K-402s), then you would have three of the four sides of the MWM bass bins loaded by the room, thus minimizing the coverage mismatch issues with the K-402's output coverage.

 

To answer your first question (K-510 horn in the center of one or more MWM bins):

 

That would actually sound better than placing the K-510 on top of the bins, since it would be coaxially aligned with the bass bin mouths.

 

To answer your second question (K-402 mounted between the MWM bass bin mouths):

 

It depends on what frequency you cross over from the MWMs to the K-402s.  The lower the frequency, the better...of course limited by the compression driver's LF output capability.  If, for instance, you're using a BMS 4592ND on the K-402 (a dual-diaphragm coaxial compression driver) you can cross over at 300 Hz.  The acoustic reflections from the back of the K-402 horn's mouth back into the MWM bins can be minimized by orienting the K-402 horizontally--this allowing the maximum width of the horn to stick out on either side of the MWM bins, which would be upright in this configuration.

 

You could also place absorbing material on the back of the K-402 horn in the areas that are intruding into the mouth of the MWM bins to further decrease the impedance bounce issues on the MWM bass bin performance. 

 

While I don't believe that I'd personally prefer the coverage pattern flipped on the MWM bins, using a compression driver that can be crossed lower will lessen the coverage angle mismatches between the HF and LF horns, and having everything located coaxially would definitely sound better and more cohesive.  Suitable in-room measurement of the new configuration using REW and a calibration microphone to reset the delays, PEQs and shelving filters on both the HF and LF would be required, I'd think.

 

Chris

Edited November 12, 2015 by Chris A

[mikebse2a3]

I see no reason you couldn't also with a little adaption (ie: support the rear and point toward a side wall with the mouth extension described by Gillum described in this pdf (see below the posted graph) originally provided by Marvel.

 

If you had two good corners and pointed toward side wall it might be possible to place a K402 at a good height in front of the mouth extension of  the system. A single style might especially work well doing this.

 

 

 

 

 

https://community.klipsch.com/index.php?/topic/143528-downwward-firing-mwm/

 

 

 

MWM Downfiring.pdf

Edited November 13, 2015 by mikebse2a3

[Coytee]

Still amazes me what people think of doing!

 

Thanks for posting that Mike.  I've never seen it.

[DrWho]

I've been working on and off for a few years on this exact same concept - but with a midbass horn only digging down to 80Hz. I just can't find a way to get perfect polar response, but I'm starting to get close.

 

The MWM doesn't have stellar polars to begin with, so I see no reason why you couldn't pursue this. Can the K510 get down low enough to couple well to the MWM? I though it was stretching things to get the K402 down that low. I'm not sure how the K510 would keep up.

 

I'd sooner go the K402 route and just live with whatever reflections catch the lip of the horn.

[Coytee]

makes for a large 'coaxial' speaker