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Multi-Way Conventional loudspeakers with crossovers

Scanspeak Revelator 32W/4878T00 13" Bass Driver
Scanspeak Revelator 32W/4878T00 13" Bass Driver
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Old 11th December 2016, 07:27 PM   #11
88man is offline 88man  United States
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The Scan-Speak 32W/4878T00 is superb in every way. You're paying for quality and sophistication. After 15+ years, one doesn't complain about how much something cost because something like this pays for itself.

I had a stereo pair TC Sounds Epic 12" subs in two 1.9 cft enclosures. One of the Epic 12" drivers failed with only light use. So, I had to replace both Epics because they're out of production or stock. As a drop-in replacement, I bought (2) 32W/4878T00 drivers. I've never looked back! The Scan-Speaks are so much better in every way - visceral impact, extension, efficiency, distortion, noise, reliability, and quality. I use it for music to accompany my Geers eVe II and a custom "Andromeda III," designed by the venerable Tony Gee.
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Old 1st April 2018, 09:10 PM   #12
Melkior is offline Melkior  France
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Hi,

Using this thread as I'm on a project for 3 ways speakers. I'm not going to built it myself (a friend of mine will do it), but I'd just need some advices about the association, is it consistent as selected ?

Tweeter = Scan Speak D3004/662000
Mid = Scan Speak 18M/4631T00 or 12MU/4731T00 (?)
Low = Scan Speak 32W/4878T00 or 26W/4867T00 (?)

Crossover Low/Mid = 200Hz
Crossover Mid/High = 1500-2000 Hz

Sealed box for the woofer + separate box for mid/High (or open bafle like a Dahlquist)

Choice according to similar sensitivity around 90 db (hard to get in 8 Ohms).
Is it better to use the 12MU with the 26W or it could fit to the 32W also?

Thanks in advance
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Old 2nd April 2018, 03:54 AM   #13
88man is offline 88man  United States
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Quote:
Originally Posted by Melkior View Post
Hi,

Using this thread as I'm on a project for 3 ways speakers. I'm not going to built it myself (a friend of mine will do it), but I'd just need some advices about the association, is it consistent as selected ?

Tweeter = Scan Speak D3004/662000
Mid = Scan Speak 18M/4631T00 or 12MU/4731T00 (?)
Low = Scan Speak 32W/4878T00 or 26W/4867T00 (?)

Crossover Low/Mid = 200Hz
Crossover Mid/High = 1500-2000 Hz

Sealed box for the woofer + separate box for mid/High (or open bafle like a Dahlquist)

Choice according to similar sensitivity around 90 db (hard to get in 8 Ohms).
Is it better to use the 12MU with the 26W or it could fit to the 32W also?

Thanks in advance
With a large membrane area such as the 32W, you're better off using the 18M to create a better transition from bass to mid than the 12MU. The 12MU might be better suited for a 22W driver.
Here's a photo of my Scan-Speak "1371." Very similar to your project, it's a 3-way using a Visaton TIW-300 and 18WU mid and 66000 tweeter and it has become my reference speaker. I used a Visiton, simply because I had it, and it's very punchy. Crossover points are 170Hz/2.1kHz, passive, 2nd-order series-fed mid tweeter, and 2nd order parallel woofer. Large mid cap is Superior Z-Cap, and the tweeter caps are Mundorf Silver Oil + Audyn Reference, with Duelund 0.01uF Ag and Vishay MKP1837 Bypass caps.

Also in the photo is also my Scan-Speak Classic "871" 2.5-way using 21W/8555, 18W/8545, and 98000 drivers. It has a series-fed crossover as well, using Mundorf Supremes Caps with Vishay MKP1837 Bypass Caps.
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Old 2nd April 2018, 06:14 PM   #14
Melkior is offline Melkior  France
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Hello 88man,

Thanks a lot for your answer. Really nice speaker and great job !
I saved the picture of your crossover, I may use it to built mine, if you don't mind.

I've had a glance to the Visatron, much cheaper, it deserves some thinking and invest more in the filter.

Initially I wanted two 10" units instead of a 12", but couldn't find something to my taste with a low VAS. I previously had a pair of Sonus Faber Stradivari Homage and the bass was incredibly strong and fast. Never been able to know which drivers Sonus used for these speakers. The mid and tweeter are Scan Speak for sure.

Just a question more, If I use the mid and tweeter in a separate open bafle, is there something specific to check on the drivers ?

Have a nice day.
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Old 15th June 2018, 07:37 PM   #15
mp006ltk is offline mp006ltk  United States
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Default Anyone used this "sub" as a woofer in a vented enclosure

I'm also looking for an excellent woofer for a 3 way, and was slightly intimidated by the closed box leaning numbers and fact they call it a sub. I know that's just a name, but often divers are optimized for an application.
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Old 19th June 2018, 06:01 PM   #16
etalon90 is offline etalon90  Canada
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I used both the 12MU and the 18W (mid bass version, the 18w8731)

No doubt that the 12MU is the horse to pick... Goes low enough and can reach higher without any breakup (~6khz from memory)

250-3khz would be excellent starting point for the 12MU.
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Old 7th July 2018, 02:01 PM   #17
Melkior is offline Melkior  France
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I'm going to start my project :-)

A last question before ordering,

Config : 1 expensive


Tweeter Scan speak D3004/66200
Mid Scan speak 18M/8631
Sub Scan speak 32W/8878 (Closed enclosure 113 liters Qtc = 0.577)


Config : 2 cheaper , bus as good as ?

Tweeter Scan speak D3004/66200
Mid Scan speak 18W/8542
Sub Scan speak 2x26W/4558 (Closed enclosure 77 liters Qtc = 0.577)


Crossover at 200 HZ and 1500 Hz


Last edited by Melkior; 7th July 2018 at 02:05 PM.
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Old 7th July 2018, 05:31 PM   #18
Pallas is offline Pallas  Pakistan
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Your bigger problem than what bass driver(s) to use is the midrange coloration from incompatibly sized midrange and tweeter. If you want to use that tweeter then look at a midrange like the ScanSpeak 10F. If you want to use that midrange, look at waveguide-loaded tweeters.
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Old 7th July 2018, 08:20 PM   #19
Melkior is offline Melkior  France
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Quote:
Originally Posted by Pallas View Post
Your bigger problem than what bass driver(s) to use is the midrange coloration from incompatibly sized midrange and tweeter. If you want to use that tweeter then look at a midrange like the ScanSpeak 10F. If you want to use that midrange, look at waveguide-loaded tweeters.

You mean the size of the mid is too big to fit the tweeter ? So a 12 or 15 cm should be enough to have a crossover above 2000 Hz. Could be a 12MU for the 26 woofer (possible crossover between 250-350 Hz) or a 15M/15W with the 32 woofer (crossover 150-200 Hz) ?
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Old 8th July 2018, 06:02 AM   #20
wolf_teeth is offline wolf_teeth  United States
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IMO, your 18cm mid would work just fine, even without a waveguide as suggested. However, a 12/15cm midrange will work better in terms of upper end extension and making the blend with any particular tweeter.

Also- I do not condone the use of the 10F in relation to the 13" or 10" woofer. The excursion required to get low enough might tax it into IMD if the woofer won't play high enough to meet it readily. It also can get the 'weight' of the lower midrange wrong at its size format. The 10F is better suited to either a smaller woofer or a 4-way system, IMO, and in fact, I really don't care for it very much. I've heard it 3-4 times, and while it could be implementation, it has always sounded mediocre at best to me.

Later,
Wolf
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