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Multi-Way Conventional loudspeakers with crossovers

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Old 12th February 2019, 05:43 AM   #81
Coasttocoast is offline Coasttocoast  United States
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Join Date: Jul 2012
Location: Honolulu
Troels usually lines the inside of his speaker builds with bitumen pads. I asked him why he omitted the bitumen on his “The Loudspeaker” project. Because of the 27mm thick Baltic Birch used he said he didn’t think it was worthwhile.

Since I’m using 2 layers of 3/4” (38mm) plus the polyurethane as the meat in the sandwich, I wasn’t planning on adding any either.

But thinking about the project last night I realized that the 10” midrange and the panel behind the 18” that makes the pocket for the crossover and plate amp is just 3/4”. So today I ran out and picked up some bitumen pads from a local supplier and wrapped these panels.

The pads are “peel and stick”, but since I have access to commercial grade contact cement I took advantage. And used a laminate roller to really press in place.

2C346222-E6AF-452A-A433-A1134E00F250.jpeg0AB6396C-40B4-40B1-BCD9-4DA4E6BA09F0.jpeg
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Babelfish J as Aleph 2, McIntosh C2300, RAKK DAC Mark IV Extreme, Oppo UDP-203 DVD/CD, Custom SP10 MKII/SME 312s/Koetsu Urushi Black, Magna Mano streamer, Tidal through Roon, Nui Horn Speaker’s (Big Speaker) w/Hypex Fusion 501’s, Transparent Ultra cables.
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Old 12th February 2019, 07:30 AM   #82
pk is offline pk  Denmark
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Default Ping Beardman

Ping Beardman,

I have send you a private message, that I hope you will respond to (just to avoid hi-jacking the thread).


Thanks!


Best regards
Peter
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Old 12th February 2019, 09:08 AM   #83
beardman is offline beardman  Denmark
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PK pm sent
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Old 16th February 2019, 12:36 AM   #84
Coasttocoast is offline Coasttocoast  United States
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I slipped into the shop a couple of afternoons and completed installing the denim insulation. All interior surfaces recieve the insulation, with the exception of the backside of the front panel. I also covered the backside of the midrange section.

E7E40247-913C-49CA-8F18-715916056D98.jpeg

91F0D51B-CF67-4E4F-8842-1B0F5C71D1F8.jpeg

E48E6BFA-860A-4E02-B7FB-13F54A3AB997.jpeg

Since I’m working my way out the back I had to install the insulation on the back panel before I can assemble.

3BCB5323-69C2-4921-867C-86A33C06941F.jpeg

The inner back panel is just tacked until tomorrow

AABA7548-3AEB-4621-9E1C-27BCC00FDFA8.jpeg

The plan for tomorrow is to make the opening for the amp, crossovers, and the final covers. Then install the outer back panel.
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Babelfish J as Aleph 2, McIntosh C2300, RAKK DAC Mark IV Extreme, Oppo UDP-203 DVD/CD, Custom SP10 MKII/SME 312s/Koetsu Urushi Black, Magna Mano streamer, Tidal through Roon, Nui Horn Speaker’s (Big Speaker) w/Hypex Fusion 501’s, Transparent Ultra cables.
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Old 16th February 2019, 02:46 PM   #85
Alex M is offline Alex M  Europe
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Great-looking build! I'm a Troels fan, but my next project will be perforce a lot more modest (at least in terms of size) than yours.

The talk of seriously well-endowed speakers reminded me of an old design I read a couple of reviews of in the 90s - the Naim DBL. Has anyone heard of a clone being made of these? I wonder what one could learn from the DBL. Naim always made a lot of claims about the sophistication of their cabinet structure, with the different parts being partially decoupled, but I don't know how much difference it made.


Alex
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Old 17th February 2019, 12:25 AM   #86
Coasttocoast is offline Coasttocoast  United States
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Thanks for the compliment!! Which speaker are you planning on building?

I’m not familiar with this Naim speaker.
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Babelfish J as Aleph 2, McIntosh C2300, RAKK DAC Mark IV Extreme, Oppo UDP-203 DVD/CD, Custom SP10 MKII/SME 312s/Koetsu Urushi Black, Magna Mano streamer, Tidal through Roon, Nui Horn Speaker’s (Big Speaker) w/Hypex Fusion 501’s, Transparent Ultra cables.
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Old 17th February 2019, 12:38 AM   #87
Coasttocoast is offline Coasttocoast  United States
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Default Cabinets complete, ready for finish.

Another long day, but completed the cabinets. I brought in the drivers, horn, plate amp, and the midrange crossover in for a last trial fit.

Planning was good, everything fit.

After installing the outer back panel I hit all the outside edges with a 1/8” roundover bit, then sanded the entire cabinet with 100 grit in a orbital sander.

From experience it’s better to hit the Medex with a coat of primer before starting any final prep. Excited to see what these will look like with some color!

7B12F916-102A-428E-9B0E-EF8C32275CF8.jpegE7374B70-C523-4B05-B67C-3BEDA4A57AF6.jpegD9E43913-DA65-450E-841F-6410E3255C94.jpeg0DAE5DB7-E35C-43C7-BB4E-8CF3A9FEB864.jpeg

58C9EEE3-A879-4AEE-95F1-DAC1B2FA5646.jpegA087F3A9-C767-48BC-9726-4677DBD3AEA3.jpeg0284A402-FCCE-43B0-ADAD-C273A06804C4.jpeg771C00F1-2908-41D6-BE7F-F904A68A0B5B.jpeg
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Babelfish J as Aleph 2, McIntosh C2300, RAKK DAC Mark IV Extreme, Oppo UDP-203 DVD/CD, Custom SP10 MKII/SME 312s/Koetsu Urushi Black, Magna Mano streamer, Tidal through Roon, Nui Horn Speaker’s (Big Speaker) w/Hypex Fusion 501’s, Transparent Ultra cables.
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Old 17th February 2019, 07:53 AM   #88
Alex M is offline Alex M  Europe
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Quote:
Originally Posted by Coasttocoast View Post
Thanks for the compliment!! Which speaker are you planning on building?
The Mun-17. I've been steadily collecting parts for the last 18 months - just the bass drivers to get now, then I can start cutting wood.

Alex
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Old 23rd February 2019, 04:01 AM   #89
Coasttocoast is offline Coasttocoast  United States
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Quote:
Originally Posted by Alex M View Post
The Mun-17. I've been steadily collecting parts for the last 18 months - just the bass drivers to get now, then I can start cutting wood.

Alex
Good luck when you get started! Looks like a good design.
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Babelfish J as Aleph 2, McIntosh C2300, RAKK DAC Mark IV Extreme, Oppo UDP-203 DVD/CD, Custom SP10 MKII/SME 312s/Koetsu Urushi Black, Magna Mano streamer, Tidal through Roon, Nui Horn Speaker’s (Big Speaker) w/Hypex Fusion 501’s, Transparent Ultra cables.
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Old 23rd February 2019, 04:16 AM   #90
Coasttocoast is offline Coasttocoast  United States
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Busy week at work, got a little time in the shop and built the “jewelry box” to hold the super tweeter.

More time consuming than one would imagine. Built around the idea of the unit being self contained with male plug on the bottom to fit into female receptical on the top of the main speaker cabinet without any wires showing.

For this I purchased mini banana plugs. Photo/details will come with final assembly.

The custom panels to cover the crossovers and hold binding posts, and compression driver attenuator came in. I’ll try figment and take pics tomorrow as I’m prepping and priming.

I would have been happier with the looks if Troels would have designed the crossover/cabinet like the JBL 4344 with the super tweeter on the main speaker cabinet baffle. But I guess this is better by time aligning the super tweeter by placing it rearward and on top. I could imagine that with full DSP you could overcome the time alignment?

I’m hoping with some routering of the “jewelry box” and paint it will look better or at least like it belongs there.

DFE0B136-1FB5-48D0-B8F0-301F742845C1.jpeg
__________________
Babelfish J as Aleph 2, McIntosh C2300, RAKK DAC Mark IV Extreme, Oppo UDP-203 DVD/CD, Custom SP10 MKII/SME 312s/Koetsu Urushi Black, Magna Mano streamer, Tidal through Roon, Nui Horn Speaker’s (Big Speaker) w/Hypex Fusion 501’s, Transparent Ultra cables.
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