Mass loaded tqwt for Beyma 8ag/n - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 25th April 2012, 03:59 AM   #1
bubuxxl is offline bubuxxl  Portugal
diyAudio Member
 
Join Date: Nov 2009
Default Mass loaded tqwt for Beyma 8ag/n

Hi guys

Im starting to feel bad about asking so many questions and advices, as Im a little bit short on knowledge but here it goes...

I had the Beyma 8ag/n on the famous "viech" BLH and it just didnt work out for me unfortunately. I became a fan of full range drivers and appreciate its advantages, but there was no bass at all.

However, I know of somebody who tried the beymas in a mass loaded tqwt and bass wise, it is known to be a completely different story!
Unfortunately, I cant find plans to try it for myself. Is there any way I can calculate dimensions or details on construction?

I have very limited experience and generally, I just follow plans and build stuff. Is there an easy way to do this?
If there is a software, is it easy enough for me to understand? I mean, I have no knowledge on the subject...

Thank you in advance for any replies!
  Reply With Quote
Old 25th April 2012, 04:30 AM   #2
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
You can try many kinds of acoustic loads for it , but the Beyma specifications say it (all):
with 30/70 W power handling and the major sensitivity located in the mid-hi regions ,whatever kind of music program will be 'executed' with that kind of response , dictated by high ( 60 Hz ) Fs , low excursion ( being the suspension 'stiff' or tough ), so the mass of air inside the cabinet would hardly cooperate with the cone movement .
A different loudspeaker ,projected for having different Cms, Vas ,Xmax etc etc Motor ,membrane ,voice coil would then produce better bass ; nowadays that is easily achieved by having in the end a low sensitivity speaker ,though it may be not suited to work in TL !
  Reply With Quote
Old 25th April 2012, 04:44 AM   #3
bubuxxl is offline bubuxxl  Portugal
diyAudio Member
 
Join Date: Nov 2009
Yeah, I know its hard to squeeze some bass out of the darn things, but according to diyer Jon Agner, it works, because he has tried it.
Unfortunately, Ive never managed to ask him the plans for it, just that they were calculated with MJKs software.

Im going to try some other speakers in the viech box, but in the meantime, the cheapest way for me is to invest in another kind of acoustic load with this driver.
  Reply With Quote
Old 25th April 2012, 05:12 AM   #4
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
I believe that a 'soft' suspension loudspeaker would do the thing easily.
It's cheaper and more rewarding , classifying the product as a first step
for entering 'hi-fi' , as you can do as many experiments as you want , but the robustness and solidity of a low bass note ...is defined as it is !
Then , you just pay 10 each 10 W in progression , ranging from 40 to 200 !!
What you pay for ? Just different driver construction for keeping up with the power , and that starts from the wire in the voice coil , the voice coil itself ,etc etc . I'm putting it also from a point of view of the 'magical side' of technology ,which may have these potions to produce the effect .
BLH is another kind . It produces some sound by directing the back wave trough an increasing volume of air , then sums the product to the front wave , and there's some delay due to the distance ( different path ) ,which may cause
some cancellations and similar effects
  Reply With Quote
Old 25th April 2012, 11:29 PM   #5
bubuxxl is offline bubuxxl  Portugal
diyAudio Member
 
Join Date: Nov 2009
Thanks for your considerations, really.
Nothing but bad news here for me as always.
Gotta start choosing more expensive stuff.
I better feed the damn beymas to the dogs.
  Reply With Quote
Old 26th April 2012, 06:42 AM   #6
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by bubuxxl View Post
However, I know of somebody who tried the beymas in a mass loaded tqwt and bass wise, it is known to be a completely different story!
OK, is it documented? How much bass? I mean this driver's published specs limits usable box loading only down to around ~105*1.15/2 = 60.4 Hz.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 26th April 2012, 03:38 PM   #7
bubuxxl is offline bubuxxl  Portugal
diyAudio Member
 
Join Date: Nov 2009
Hi GM

It is documented by a fellow diyer, Jon Agner. He said he stopped tuning at 35hz or something like that. I didnt needed it to go that low but, he says they sounded very good. He now uses the exact same box (me thinks) with a philipinno made 8" full range, judging from the pictures...

All I know is that it was a folded mass loaded tqwt.
  Reply With Quote
Old 26th April 2012, 03:40 PM   #8
bubuxxl is offline bubuxxl  Portugal
diyAudio Member
 
Join Date: Nov 2009
He goes by the name Jagner here in diy audio! I pm him twice, but unfortunately he didnt replied back the plans. He seems like a nice guy, very polite.
  Reply With Quote
Old 27th April 2012, 01:58 AM   #9
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Greets!

All I found was an invalid photo link from 2008. Regardless, there's no way to get a lot of gain out of a vented alignment that is tuned below the lower mass corner and what is doable requires a very large cab, especially for such a high Qts driver. Even then this assumes the published specs applies to your drivers, which I seriously doubt.

Anyway, it's going to take at least a ~10.74 ft^3 MLTL cab to get down into the 30s even at a very rolled off output. If hes doing it in a ML-TQWT of less net Vb, then its LF output will be less also [excluding any room gain of course].

The 1st sim is tuned to ~41 Hz [12" dia. reflex vent] and the 2nd at ~35 Hz [8" dia. reflex vent].

GM
Attached Images
File Type: gif 8AG_N 41 Hz MLTL.gif (6.7 KB, 229 views)
File Type: gif 8AG_N 35 Hz MLTL.gif (6.7 KB, 229 views)
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 27th April 2012, 05:00 PM   #10
bubuxxl is offline bubuxxl  Portugal
diyAudio Member
 
Join Date: Nov 2009
Hi GM

Sure, it would be big, but Im already living with these huge blh in my living room, so Im not expecting anything out of the ordinary...
He got some help from MJK(?) and his software and one thing i know of, theres a port firing below the box. Im not a fan of subwoofers, I just wanted my music with a little more foundation thats all. In my living room, unfortunately, BLH dont get along well, maybe if I had a bit more room they would be enough, but they are bastards regarding positioning. So this would be a huge improvement for me. Could you help me out with some box dimensions?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tqwt with Beyma BEYMA 12XA30/Nd simulation sladdbarn Multi-Way 11 18th May 2013 03:58 PM
Adding a tweeter to Beyma 8ag/n bubuxxl Full Range 10 8th November 2012 12:26 PM
Beyma 8AG/N horn or "the Viech" Cyburgs Full Range 112 12th August 2012 01:57 PM
Bass reflex box for Beyma 8ag/n bubuxxl Full Range 29 21st October 2010 12:20 PM


New To Site? Need Help?

All times are GMT. The time now is 08:51 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2