Anyone know this old plan? huge 3 way top
Printed From: Speakerplans.com
Category: Plans
Forum Name: Other plans
Forum Description: Discussion / Questions about all the other plans
URL: https://forum.speakerplans.com/forum_posts.asp?TID=108783
Printed Date: 26 March 2026 at 6:54pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: Anyone know this old plan? huge 3 way top
Posted By: Jan-2T
Subject: Anyone know this old plan? huge 3 way top
Date Posted: 07 November 2024 at 9:01am
|
Hi All, I bought these speakers over a decade ago off an old guy who built them. Laminated curves and stuff, was a complicated build he told me. He said the plans were from a magazine from the 70's and thought it were RCF plans. https://www.dropbox.com/scl/fi/3qkkpwo6vfuekpztuf5if/IMG_20240414_123927063_MFNR.jpg?rlkey=9auvau7jlu08kzqkgirtqoss5&st=vya2var6&dl=0 https://www.dropbox.com/scl/fi/5rds2413hpy4h7kizmg47/IMG_20240414_123939364_MFNR.jpg?rlkey=ebnx1yrde5l7gwlr7k3zesjr8&st=s7xavy2w&dl=0 Now I always wondered what they are, original specs/ drivers, ... He placed other speakers in them so no guide there. It's a 12", 10" and the tweeter. Active filter 800Hz between the 12" and the 10"+tweeter (have a passive filter, freq unknown) (cant seem to get the pictures or hyperlink to work the way I want with the BBcodes)
|
Replies:
Posted By: Jan-2T
Date Posted: 13 November 2024 at 10:16am
  ------------- Music! |
Posted By: Bams
Date Posted: 13 November 2024 at 10:48am
| in the 70's and 80's many companies shared free plans in the hope people bought their speakers. this is propably one of their more complex concepts. never seen one though so cannot help you any more. placing of the tweeter seems a bit odd. no crossovers with information to help you out? |
Posted By: teeth
Date Posted: 13 November 2024 at 11:39am
| tweeter definitely retrofitted |
Posted By: Jan-2T
Date Posted: 13 November 2024 at 12:05pm
|
yep a botch job on the retrofitted tweeter btw... I'll look for the best way to find speakers specs for an unknown cabinet... Or would I better start looking for something else to go on top of 3x startec H/R118 and 1x Martin Fake2B stack...  ------------- Music! |
Posted By: Earplug
Date Posted: 13 November 2024 at 1:36pm
|
What drivers do they have? That may be a clue - or at least help you decide what to do with the cabs. Do they sound any good? And could (vaguely) be an ASS design - altho' finish looks a bit rough. ------------- Earplugs Are For Wimps! |
Posted By: jazomir
Date Posted: 13 November 2024 at 5:54pm
|
Could it be a modified EV MTH2? There are a few similarities - even using Google Lens - it would have been a reasonably simple mod to double up the low mid section especially as EV used to supply plans back in the day. ------------- For sidefills, can we have two enormous things of a type that might be venerated as Gods by the inhabitants of Easter Island, capable of reaching volumes that would make Beelzebub soil his pants. |
Posted By: Pinheiro
Date Posted: 13 November 2024 at 7:01pm
|
Hi all not the same but all most KKKKK http://hornplans.free.fr/pas1ma1.html" rel="nofollow - http://hornplans.free.fr/pas1ma1.html
|
Posted By: Jan-2T
Date Posted: 14 November 2024 at 7:59am
|
They are 50cm in front I remember, I had them stacked on punishers with same width kick inbetween. Tonight I'll open them up and check what's to find on the inside ------------- Music! |
Posted By: Bams
Date Posted: 14 November 2024 at 9:56am
| Check the crossover, drivers and inside of the cabs for marks and information. Most smaller builders leave such traces. Like “reconed 1987 eglantier” which would point to an early AED service. |
Posted By: Earplug
Date Posted: 14 November 2024 at 10:36am
|
Yes, you never know. There might be some treasure in there -- like an old Gauss, or ATC driver.  Worse bodge in the world is that tweeter.  ------------- Earplugs Are For Wimps! |
Posted By: Jan-2T
Date Posted: 14 November 2024 at 11:03am
|
I had them open when i bought them, was fitted eminence or something if i remember correct, was +10y ago so... Were no original drivers seller told me. ------------- Music! |
Posted By: madboffin
Date Posted: 14 November 2024 at 1:31pm
|
They would probably work quite well if you replace the upper panel and tweeter with a horn and 1" driver (if you can find one to fit) and run them 3-way active. |
Posted By: Jan-2T
Date Posted: 14 November 2024 at 2:52pm
|
I have many fostex N-30 tweeters laying around, 1"voice voil and small enough horn to fit in there. ------------- Music! |
Posted By: Earplug
Date Posted: 14 November 2024 at 6:27pm
|
Yes, you never know. With a proper (modern) DSP you could make them work
again. I would definitely get a 1" driver & horn in there. How many do you have? ------------- Earplugs Are For Wimps! |
Posted By: Jan-2T
Date Posted: 15 November 2024 at 8:06am
|
I've got like 8 of those fostex tweeters and currently use a driverack PA. ------------- Music! |
Posted By: Earplug
Date Posted: 15 November 2024 at 11:32am
|
Haha - I meant how many of those cabs do you have!  In any case, those Fostex look very similar to the Selenium DT150! I have a few of those in some cabs & they are pretty good. You can get titanium, or phenolic diaphragms for them, according to taste. I found the titanium a bit harsh & prefer the phenolic. In any case, I reckon that they would be better than the thing tacked on there at the moment. Maybe 2 per cab with a Y adaptor. ------------- Earplugs Are For Wimps! |
Posted By: Jan-2T
Date Posted: 15 November 2024 at 12:42pm
|
I have 2 cabs Exact what I was thinking, putting two in there, do you mean the Y piece like a piece of plumbing hardware? These are no threaded compression drivers, rather one unit. magnet and horn with diaphragm squished in-between. (I also like to avoid the harsher sound of titanium diaphragms) ------------- Music! |
Posted By: Earplug
Date Posted: 15 November 2024 at 1:44pm
|
Ok, shame that they are not threaded. I'm not sure how you could do it then. Maybe lots of epoxy resin, hahaha. Screw-on Y adaptor:- https://www.atlasied.com/yda-th" rel="nofollow - https://www.atlasied.com/yda-th They were also available for bolt-on drivers/horns, but are now quite rare. ------------- Earplugs Are For Wimps! |
Posted By: Jan-2T
Date Posted: 18 November 2024 at 11:58am
  Fane Studio 12B Fane Studio 8M Beyma CP-21F Crossover writing: MODEL HL 612 B Verbiest 1985 MADE IN BELGIUM (and the company still exists today, same logo http://www.verbiest.be/) and someone closed up the reflex shelf port (guaranteed the same butcher who did the tweeter)  ------------- Music! |
Posted By: Earplug
Date Posted: 18 November 2024 at 12:49pm
|
Ok, I'm not a big fan of Fane drivers, but given the frequencies the cab covers, they may do the job. And that isn't a bad quality tweeter either, but definitely not there. Total horrible bodge. And wrong dispersion pattern for that cab. ------------- Earplugs Are For Wimps! |
Posted By: Jan-2T
Date Posted: 18 November 2024 at 2:52pm
|
I may want to measure the internal volumes to find some nice speakers to fit the specs needed. I read the 12B would be well suited for horns. I have simulated reflex cabs, are the horns more difficult to sim? What tweeter dispersion angle would be more suited for this cab style? ------------- Music! |
Posted By: Earplug
Date Posted: 18 November 2024 at 3:41pm
|
Yes, I think that horn loaded design is quite a bit more complicated. You maybe need to get Hornresp & spend a bit of time learning the process. You want a hf horn that matches the other 2 there already. Maybe 60º? The CP-21F is 140º. Far too wide. ------------- Earplugs Are For Wimps! |
Posted By: Jan-2T
Date Posted: 27 November 2024 at 9:09pm
|
I installed Hornresp on my Linux (virtual XP) and got some results. The response for the 8" BLH looks to be too low to be real, especially with the tweeter 7500 Hz filter... grey reference sealed box 15l. (on axis for sealed the response stays level across higher freq, could ot select directivity for the horn though)
The 12 gives this next result, looks better but still not much above 1kHz, realistic enough? Compound Horn with the tapered reflex port
Same
driver in sealed chamber BLH gives higher but rimpled response,
less SPL below 200Hz, seems more plausible than the 8" I tried with other 8" drivers T.S. with similar results, any pointers, or is this cabinet just a crappy design? ------------- Music! |
Posted By: bob4
Date Posted: 28 November 2024 at 4:10am
|
It's NOT a BLH, BLH = back loaded horn. You should simulate a FLH = front loaded horn. |
Posted By: Jan-2T
Date Posted: 28 November 2024 at 2:04pm
Ah damn it's like left and right, i always say it wrong  Anyway, when measuring the volumes and horn dimensions i seriously started doubting the build quality, for example there was a different edge inside on left side like a sheet that protruded into the volume. The 8" horn makes no sense, tapers back into smaller angle where the flat wood is, you can see that in the first pics. The reflex port is huge, 80x370mm and wider in front ( thats like 3.5 x 15 inches) I guess maybe the builder saw a cabinet somewhere and built this out of his head... Im gonna sell the speakers, tweeter and crossover, and i'll probably scrap the wood. (I made a nice deal on vibe-30 twin 15 cabs with a 1,75 horn  )------------- Music! |