Official Selah Audio Owner's Thread - Page 12 - AVS Forum | Home Theater Discussions And Reviews
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post #331 of 345 Old 04-25-2019, 06:03 AM
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Originally Posted by Russdawg1 View Post
Quite a speaker Rick. Got any pointers for someone who’d be interested in designing their own speaker from the ground up?

I’d like to build my own towers or line array in the near future, that’s why.
The best way to learn is by starting with a kit. After that comes reading all that you can (such as Vance Dickason's book) and acquiring crossover design software and measuring equipment.
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post #332 of 345 Old 04-25-2019, 02:59 PM
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Here's a center channel I recently deigned to match a a pair of Adam L/R speakers. Due to space constraints (7" maximum height) and the desire for a high quality AMT or ribbon driver I chose one that would cross low. The mids are Eton Hexacone 3" drivers which is what many of the Adam speakers use. With a horizontal MTM layout the spacing of the mids and tweeter becomes very important.

I've attached horizontal and vertical off-axis plots. The first graph is on-axis with the tweeter and fifteen degrees off-axis horizontally. With the low crossover point, steep acoustic crossover slopes, and close driver spacing the response stays very uniform. The next graph adds the thirty degree horizontal curve and it shows some changes due to the delayed signal of the midrange that's further away as well as the woofer on that side. Due to the symmetrical layout both sides will have the same coverage which is a good thing as that's what the movie sound engineer intended.

Vertically the coverage remains uniform out to 10K at ten degrees and remains uniform at seventeen degrees but starts to roll off more at 4K and above due to the 76mm length of the ribbon. How important this is depends on your listening angle but dialogue should still be in good shape.

This represents what I feel is the limit of a horizontal MTM layout and if you don't need a ribbon/AMT/planar driver a good low profile option is a small neo dome and 3"-4" mid vertically arranged or a concentric driver (Elac, KEF, etc.). If height permits a WMTW layout has better coverage than the horizontal MTM arrangement. The WMTW also works well behind a screen if a vertically placed center isn't possible.
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Last edited by Rick Craig; 04-25-2019 at 06:57 PM.
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post #333 of 345 Old 04-28-2019, 07:36 PM
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Our version of "modern rustic"...
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post #334 of 345 Old 04-28-2019, 08:05 PM
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Iluminismo - scanspeak illiminators? Be tweet? Active bass or passive?

Sent from my SM-G955U using Tapatalk
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post #335 of 345 Old 04-28-2019, 11:26 PM
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Quote:
Originally Posted by Rick Craig View Post
Our version of "modern rustic"...
Hmm, is that a cabinet available from OEM sites or is that a custom cab? It looks almost exactly like the one used in the Joseph Audio Pulsar. I wonder if you could take that cab, use the Seas T25CF002 and W15CY and just make a clone for like half the price, lol.
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post #336 of 345 Old 04-29-2019, 06:32 AM
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Originally Posted by canyoncreek View Post
Iluminismo - scanspeak illiminators? Be tweet? Active bass or passive?

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SB Acoustics Satori woofers and beryllium tweeter. The bass section is passive; however, an active version is a great option.

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post #337 of 345 Old 04-29-2019, 06:41 AM
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Originally Posted by driedmango View Post
Hmm, is that a cabinet available from OEM sites or is that a custom cab? It looks almost exactly like the one used in the Joseph Audio Pulsar. I wonder if you could take that cab, use the Seas T25CF002 and W15CY and just make a clone for like half the price, lol.
A custom cabinet. Faceted designs of course go back several years and there's only a few ways to make them. Jeff Joseph is a nice guy and the Pulsar is a good speaker.

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post #338 of 345 Old 04-29-2019, 07:11 AM
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A custom cabinet. Faceted designs of course go back several years and there's only a few ways to make them. Jeff Joseph is a nice guy and the Pulsar is a good speaker.
I'm planning to be at the Dallas show this weekend and was wondering what you'll be showing there. Can you say?


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post #339 of 345 Old 04-29-2019, 07:59 AM
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I'm planning to be at the Dallas show this weekend and was wondering what you'll be showing there. Can you say?


David
Yes, the Ritorno 2-way monitosr and the Omaggio line arrays. Looking forward to meeting you!
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post #340 of 345 Old 04-29-2019, 08:35 AM
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Quote:
Originally Posted by Rick Craig View Post
Our version of "modern rustic"...
Those are quite beautiful, Rick.
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Display: Vizio P55-E1l Pre-pro: Marantz 7703; Amps: Emotiva XPA-2 Gen 2, Emotiva XPA-3 Gen 1, H/K AVR 520 (direct in to amps); Sources: Sony UBP-X700; X-box 1 S; Technics 1200 Mk II; Win10 PC for digital; Phono Preamp: Emotiva XPS-1; Speakers - LR: Philharmonic BMR LR, Center: Emotiva Airmotiv C2; Surrounds: Wharfedale Reva-2; Rear Surrounds: Wharfedale Diamond 220; Atmos: TF - Monoprice Alpha 8; TR - BIC VI-38; Subwoofers: dual Rythmik L22s
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post #341 of 345 Old 05-14-2019, 12:27 PM
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Those are quite beautiful, Rick.
Really enjoyed seeing Rick and these speakers at the show....they look even better in person, and sound better than that.


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post #342 of 345 Old 05-15-2019, 12:43 PM
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Rick designed a center for me to go with the Philharmonic BMRs, roughly based on the Ceramica center. It's using the SB Acoustics woofers, but with the RAAL 64-10 tweeter and the BMR driver as the midrange. My daughter and I will be building the cabinet, but I went ahead and got the prototype baffle from Rick since the BMR has a little tricky recess. Got the baffle yesterday. Not sure when the rest of the kit is coming, but should not be too much longer. I've an out of town family wedding this weekend, so won't get to start cobbling the cabinet together for awhile anyway.

Edit: Oh, I went with the black cones on the woofers rather than the white to more closely match the BMRs, which I typically listen to with the grills off.
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Display: Vizio P55-E1l Pre-pro: Marantz 7703; Amps: Emotiva XPA-2 Gen 2, Emotiva XPA-3 Gen 1, H/K AVR 520 (direct in to amps); Sources: Sony UBP-X700; X-box 1 S; Technics 1200 Mk II; Win10 PC for digital; Phono Preamp: Emotiva XPS-1; Speakers - LR: Philharmonic BMR LR, Center: Emotiva Airmotiv C2; Surrounds: Wharfedale Reva-2; Rear Surrounds: Wharfedale Diamond 220; Atmos: TF - Monoprice Alpha 8; TR - BIC VI-38; Subwoofers: dual Rythmik L22s
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post #343 of 345 Old 05-18-2019, 10:29 AM
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Quote:
Originally Posted by BluesDaddy56 View Post
Rick designed a center for me to go with the Philharmonic BMRs, roughly based on the Ceramica center. It's using the SB Acoustics woofers, but with the RAAL 64-10 tweeter and the BMR driver as the midrange. My daughter and I will be building the cabinet, but I went ahead and got the prototype baffle from Rick since the BMR has a little tricky recess. Got the baffle yesterday. Not sure when the rest of the kit is coming, but should not be too much longer. I've an out of town family wedding this weekend, so won't get to start cobbling the cabinet together for awhile anyway.

Edit: Oh, I went with the black cones on the woofers rather than the white to more closely match the BMRs, which I typically listen to with the grills off.
Here's the test cabinet. I will post more later today.
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post #344 of 345 Old 05-18-2019, 12:30 PM
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Quote:
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Quote:
Originally Posted by BluesDaddy56 View Post
Rick designed a center for me to go with the Philharmonic BMRs, roughly based on the Ceramica center. It's using the SB Acoustics woofers, but with the RAAL 64-10 tweeter and the BMR driver as the midrange. My daughter and I will be building the cabinet, but I went ahead and got the prototype baffle from Rick since the BMR has a little tricky recess. Got the baffle yesterday. Not sure when the rest of the kit is coming, but should not be too much longer. I've an out of town family wedding this weekend, so won't get to start cobbling the cabinet together for awhile anyway.

Edit: Oh, I went with the black cones on the woofers rather than the white to more closely match the BMRs, which I typically listen to with the grills off.
Here's the test cabinet. I will post more later today.
Very nice!

Display: Vizio P55-E1l Pre-pro: Marantz 7703; Amps: Emotiva XPA-2 Gen 2, Emotiva XPA-3 Gen 1, H/K AVR 520 (direct in to amps); Sources: Sony UBP-X700; X-box 1 S; Technics 1200 Mk II; Win10 PC for digital; Phono Preamp: Emotiva XPS-1; Speakers - LR: Philharmonic BMR LR, Center: Emotiva Airmotiv C2; Surrounds: Wharfedale Reva-2; Rear Surrounds: Wharfedale Diamond 220; Atmos: TF - Monoprice Alpha 8; TR - BIC VI-38; Subwoofers: dual Rythmik L22s
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post #345 of 345 Old 05-18-2019, 06:23 PM
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On-axis curves for the BMR-CC drivers (no crossover). I also have 15 and 30 degree curves that I use for entering into my crossover software. This gives a good comparison for determining the output /sensitivity of the three driver sections. Room effects are creating the peak and dip below 200hz. The ribbon's response changes in the lower frequencies because of the room's noise floor being higher than the output of the tweeter.

The second graph is the nearfield bass curve for the sealed box woofers.
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