Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

supertweeters for a budget tri-amped setup
supertweeters for a budget tri-amped setup
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 8th July 2018, 11:41 PM   #1
vladn is offline vladn  United States
diyAudio Member
 
Join Date: Feb 2008
Default supertweeters for a budget tri-amped setup

This is a little OT for the full range discussion, but... I have a pair of 126en that I want to put to use. My setup has an active x-over (dbx 234s) feeding a single sub, and a DIY AAB P-P triode amp for the mid-upper range. The speakers I use now for the tube amp are not even worth mentioning (<45/pair).

The plan is to build BK-12m flatpack for my 126en drivers and run it from the existing tube amp. I have an extra x-over freq on 234s that I can use for supertweeters (my hearing is going down a bit). Except for the 234s this is a budget setup, so my idea is to run something like Dayton AMT Mini-8 from a LP-2020A amp with a x-over freq around 8k, the BK-12m from the 80Hz to 8k off the DIY tube amp and a single sub below 80Hz.

I'd appreciate any advise on budget supertweeters that will work reasonably well with BK-12m 126en mains (using an active x-over).
  Reply With Quote
Old 9th July 2018, 06:58 PM   #2
Ray21 is offline Ray21  United States
diyAudio Member
 
Join Date: Nov 2011
I'm currently using Dayton AMT Mini-8s as supertweeters in my compact office OB setup with FE127e. I'm rolling them in with a simple 1st order XO and L-pad and I really love it. They integrate very well and add some nice sparkle.
  Reply With Quote
Old 10th July 2018, 11:39 AM   #3
vladn is offline vladn  United States
diyAudio Member
 
Join Date: Feb 2008
I am inclined to try them. With an active L-R x-over I can interactively tweak both the x-over frequency and the power balance between the 126en and these tiny ribbons. Even If I dislike them it would be an interesting experiment in itself.
  Reply With Quote
Old 14th July 2018, 02:39 AM   #4
vladn is offline vladn  United States
diyAudio Member
 
Join Date: Feb 2008
Got the Dayton AMT mini-8 and temporarily hooked them up to a dedicated amp and set the active LR4 XO to about 9k. I like them so far, they partially offset my ageing hearing.

Now back to BK-12m (126en). I just received the flatpacks (and related stuff), bought the required clamps (plus two extra 12") and a bottle of each - titebond I and titebond III glue. Two questions:
- this is my first cabinet build, is there a more detailed instruction/video than a single sheet that comes with a flatpack ? I'd like to avoid common pitfalls;
- I want to keep the top of the speakers flat, hence I plan to mount mini-8s just below the 126en using a hole saw (with a separate wiring to the dedicated amp). It is not going to be much lower than the 126en, but I am still a bit worried about such placement...
  Reply With Quote
Old 14th July 2018, 03:18 AM   #5
Octavia is offline Octavia  United States
diyAudio Member
 
Join Date: Mar 2008
don't worry, be happy - it's a supertweeter, just keep those frequencies lifted up where they belong (a friend has the exact same speaker and has a top mounted Beston RT002A as a super tweet about 12khz and it adds that extra upper air that makes the whole frequency range sound like there's more there, there. You are going to love these speakers.
  Reply With Quote
Old 14th July 2018, 09:11 PM   #6
vladn is offline vladn  United States
diyAudio Member
 
Join Date: Feb 2008
Modified MK-12m baffles for AMT mini-8s, tried to put these reasonably close to 126en.
The only thing painted will be the baffles - I am not good at painting and also it gives a nice contrast to the cabinet.

Next step - drill more holes for a double set of wires / posts. And then the most scary part - gluing the boxes...
Attached Images
File Type: jpg baffles_mod.jpg (95.2 KB, 259 views)
  Reply With Quote
Old 17th July 2018, 12:54 AM   #7
vladn is offline vladn  United States
diyAudio Member
 
Join Date: Feb 2008
This is turning into a build thread, but perhaps it will help some... The only two changes that I've done to the BK-12m kit are the additions of AMT mini-8 as supertweeters on separate connectors and a cork pad at the top of the horn bend. Everything else was pretty much following the build manual verbatim.

I've almost finished the 1st speaker (still using clamps for one side so I can tweak the stuffing to my taste). The 2nd one is glued, waiting for wiring.

First impressions - I do not have an unechoic chamber and reference mics. But based on my subjective hearing - very good treble and decent highs (triamped, or better to say 2.5 amped setup). Sensitivity is at least 6db higher than my generic speakers (good for the small tube-powered mid-range amp). It does not like low sub XO point (a bit of booming), but set at ~90Hz it is very nice. The upper XO point to the supertweeter is now set to 9k, but I may play with that. With the tunable 3-band active XO I can probably throw away my EQ...

I was disappointed with the Lepy 2020A (noise level and occasional lock-ups) that I used for the supertweeters, also it does not use the original Tripath chip (unlike the one I got few years ago), but rather a clone... While an overkill for my setup, I got the Dayton 120 for the supertweeters. Very noticeable improvement (noise level, clarity).

I like this entry level cabinet design very much, but have some complaints about the CNC machining and some delaminations (1..3" long) on the side panels that required low viscosity CA and sanding to fix.

Anyway subjectively the first speaker sounds very nice to my ears on classical, jazz, instrumental, vocal, old disco and rock music. More to come.
Attached Images
File Type: jpg bk-12m_st.jpg (117.7 KB, 254 views)
File Type: jpg bk-12m-cork.jpg (153.8 KB, 232 views)
  Reply With Quote
Old 17th July 2018, 02:24 AM   #8
chrisb is offline chrisb
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
vlad -FWIW, after a few years of doing it myself, I can attest that unless the fabricator of flat packs is willing to accept either a high reject rate on cut parts due to the potential of random delams, or eat the cost of higher quality Apple ply, you’re gonna run into that from time to time.

As for amps, have you given any thought to the ACA 1.6? For my money it’s a home-run, and should have no problem driving what I’d imagine should be a very benign system load of the Fostex, Dayton and a simple XO
__________________
you know I can’t quit you, baby

Last edited by chrisb; 17th July 2018 at 02:33 AM.
  Reply With Quote
Old 17th July 2018, 03:15 AM   #9
vladn is offline vladn  United States
diyAudio Member
 
Join Date: Feb 2008
I got hooked to an instantly tuneable active XO since I bought the dbx 234s. I use two separate XO frequencies since I do not want to mix the sub with the 126en and 126en with the supertweeter. The XO box uses L-R 4th order which are fairly steep and the XO frequencies are outside the most critical range.

My tube "midrange" amp is very clean, I've spent a lot of time finding the poles using phase shift measurements with the open NFB and got the lead-lag comp to near perfection. With 126en this amp (~1W-A, ~4.5W-AB) is plenty loud for my needs. If anything the sub and the supertweeter amps are overpowered
  Reply With Quote
Old 17th July 2018, 03:28 AM   #10
chrisb is offline chrisb
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Fair enough - your satisfaction is the most important metric
__________________
you know I can’t quit you, baby
  Reply With Quote

Reply


supertweeters for a budget tri-amped setupHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Alpair 6p vs 6m vs 7.3 for a budget nearfield setup limyang Full Range 31 22nd May 2018 04:06 PM
budget studio setup for a friend thadman Multi-Way 5 3rd January 2011 11:57 AM
Bonjour de Montréal - Budget Dayton DIY setup... flyinglemur Multi-Way 27 18th April 2010 03:15 PM
Input on 5.1 diy setup, budget friendly *n00b* Blazin_Jason Multi-Way 18 20th January 2009 10:32 PM
Amps for tri-amped HT setup dc Digital Source 6 29th March 2002 11:36 PM


New To Site? Need Help?

All times are GMT. The time now is 09:03 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki