Good 8" drivers for Tapped horns with long path lengths? - diyAudio
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Old 13th February 2014, 02:11 AM   #1
sine143 is online now sine143  United States
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Default Good 8" drivers for Tapped horns with long path lengths?

hey guys. so to this point I've basically limited myself to FLH and vented boxes in hornresp. someone on another forum asked about a horn that would fire into the corner whilst being placed snug against both perpindicular walls. someone posted a rough dual 8 drawing of a FLH, but I figured a tapped horn would make better use of the space givin the very small mouth size it would have.

heres a pic of a rough little mockup. I've simmed something I'm pretty sure I could fold using 4x the anarchy 6.5inch driver. I was wondering if there were any 8" that were relativly low cost (50 a piece would be nice) that work well in a 20 to 25hz tapped horn.

Also, the whole flared s1 thing... how exactly do you go about modelling that with the driver in the flare.

EDIT: sidenote. Being tight into the corner when designed as such should also increas the l45 length correct? and alter mouth size to be the sice of the triangle on top lol.
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File Type: jpg quad 8 corner tapped horn concept.jpg (135.2 KB, 339 views)

Last edited by sine143; 13th February 2014 at 11:09 PM.
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Old 13th February 2014, 02:50 AM   #2
tomlang is offline tomlang  United States
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The MCM 55-2421. There is at least one other tapped horn and many other horns using this driver. I see it for $23 each in quantities of 4 right now.

MCM Audio Select 8'' High Excursion Woofer - 120W RMS 4ohm | 55-2421 (552421) | MCM Audio Select
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Old 13th February 2014, 03:06 AM   #3
sine143 is online now sine143  United States
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That was my initial hunch as well... but the low fs seems to be a problem. while is is markably more sensitive than the anarchy in the design, its hard to get a very smooth response with it.
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Old 13th February 2014, 04:49 AM   #4
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Has anyone ever measured the specs of that MCM 8" to see if they actually match the published specs?
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Old 13th February 2014, 04:51 AM   #5
sine143 is online now sine143  United States
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there is a thread on diyaudio that has a couple different measurements on them. I used the average measurement for my first couple sims.
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Old 13th February 2014, 06:59 AM   #6
GM is online now GM  United States
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Quote:
Originally Posted by sine143 View Post
but the low fs seems to be a problem. while is is markably more sensitive than the anarchy in the design, its hard to get a very smooth response with it.
Yeah, it wants to go as low as the DSL DTS-10 except at a 5:1 CR. Still, THX reference in theory down to ~13 Hz in ~300 L net using [4] cheap 8" crammed into a corner seems worth the gamble.........

GM
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File Type: txt 55-2421_11Hz_DTS.txt (972 Bytes, 21 views)
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Last edited by GM; 13th February 2014 at 07:16 AM. Reason: corrected sim
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Old 13th February 2014, 07:32 AM   #7
GM is online now GM  United States
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Scaled to ~18.6 Hz, ~179 L net, >120 dB above 20 Hz in theory.........

GM
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File Type: txt 55-2421_18Hz_DTS.txt (973 Bytes, 21 views)
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Old 13th February 2014, 09:34 AM   #8
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Quote:
Originally Posted by Brian Steele View Post
Has anyone ever measured the specs of that MCM 8" to see if they actually match the published specs?
I measured mine, and they were consistent with John Krutke's measurement:

MCM 55-2421 T/S Parameters and thoughts

IMHO, the Alpine Type Rs offer a lot better sound for not a lot more money.
I wish there was a 'deluxe' version of the 55-2421 that sounded cleaner. It has some great specs, but it just sounds grungey.

Having said that, I still have one in my home theater :P
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Old 13th February 2014, 12:43 PM   #9
JLH is offline JLH  United States
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You get what you pay for with the MCM 55-2421. While the initial specs of the MCM look a lot like the Tang Band W8-740, the MCM lacks the quality of materials found in the Tang Band. If you are looking for low price then I would have to agree that the Alpine R series are hard to beat.
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Old 13th February 2014, 06:59 PM   #10
sine143 is online now sine143  United States
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speaking of which, whats the rule on compression ratio for 8s or smaller? with the anarchy i'm having pretty good luck with around a 3.5 to 1 compression ratio. Heres the initial draft, 280 liters net for 4x drivers.

Ideally I'd like the 8" version to stay under 375 liters net but give me solid flat to 25, or 20, I think the extra displaacement will really help it go down lower (horn path is 420 on the 6 version).
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Last edited by sine143; 13th February 2014 at 07:05 PM.
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