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

Altec 406 - 8Y
Altec 406 - 8Y
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 30th July 2017, 01:31 PM   #11
DaveCan is offline DaveCan  Canada
diyAudio Member
 
DaveCan's Avatar
 
Join Date: Nov 2005
Location: Moncton NB
That's a pretty nice little cab. Couldn't find any specs but here's a few in action, nice!

ALTEC 890C Bolero - YouTube
ALTEC 890C Bolero - YouTube
ALTEC - 890B BOLERO - YouTube
Altec/アルテック Bolero ボレロ 動作確認 - YouTube
  Reply With Quote
Old 31st July 2017, 01:49 AM   #12
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
OK, got my memory refreshed and the 406 is a 10" variant of the 12" 414B, i.e. has a 414 motor with Y = no pot, C = pot and a [NLA] special two stage curvilinear diaphragm; factor in that it's designed to drive a heavy phase inverter [AKA passive radiator] in the Bolero it seems reasonable that Fs, Qts will be similar and once again 'lucking up' in a quick Google image search found this to be true.

Response and basic T/S measurements of a 406-Y:

GM
Attached Images
File Type: png Bolero 406-Z T-S specs.PNG (214.5 KB, 129 views)
File Type: png 406-Z FR plot.PNG (235.3 KB, 133 views)
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 31st July 2017, 02:10 AM   #13
steve jones is offline steve jones  United States
diyAudio Member
 
steve jones's Avatar
 
Join Date: Mar 2002
Location: Vancouver USA
I've got a pair from the Altec 890C Bolero. I'll try and pull them and take them to a local speaker guy Jamac, and see if he can measure the T/S parameters. Always wanted to, those are a really unique 10 inch woofer; with the 12" 414 woofer's 3" VC & Alnico motor. They sound like a big Altec, nothing else that size comes close.

Will get back later.
  Reply With Quote
Old 31st July 2017, 02:36 AM   #14
steve jones is offline steve jones  United States
diyAudio Member
 
steve jones's Avatar
 
Join Date: Mar 2002
Location: Vancouver USA
Moderator, please delete my post above. GM beat me to it.

Last edited by steve jones; 31st July 2017 at 02:45 AM.
  Reply With Quote
Old 31st July 2017, 04:15 AM   #15
Bobo65 is offline Bobo65  United States
diyAudio Member
 
Join Date: Sep 2011
Default Altec 406-8Y

Thank you very much for this information.

Fs = 28
Qts = .24
Vas = 105

(Is the Vas in litres or inches?)

In the opinion of the readers of these posts, what would be the optimal type/size of box for these drivers? Why?

What about open baffle?
  Reply With Quote
Old 31st July 2017, 04:21 AM   #16
Bobo65 is offline Bobo65  United States
diyAudio Member
 
Join Date: Sep 2011
Default Altec 406-8Y

Sorry, just noticed Vas is in liters
  Reply With Quote
Old 31st July 2017, 05:22 AM   #17
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by steve jones View Post
Moderator, please delete my post above. GM beat me to it.
Can't have too many measurements.........

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 31st July 2017, 06:24 AM   #18
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by Bobo65 View Post
In the opinion of the readers of these posts, what would be the optimal type/size of box for these drivers? Why?

What about open baffle?
You're welcome!

Well, T/S specs says too low a Qts [< 0.312] for optimal venting, hence the PR, unless driven with a high output impedance to raise it [Qts'], so ideally would be in a large compression horn.

OB will work of course, though needs a helper [sub] woofer to fill in below its upper mass corner [fhm].

fhm = 2*Fs/Qts'

Qts' = Qts + any added series resistance: http://www.mh-audio.nl/newqts.asp

What I do, recommend for these type specs is a mass loaded [vented] TL = MLTL where net volume [Vb] = Vas, tuning [Fb] = Fs, which uses a TL to mass load the vent, improving the mid-bass some and allowing extension down to Fs, a real plus if driven with a high output impedance, so......

What are you going to use up high and assuming these will be used in a HIFI app, your average seated hear height or whatever height you want the HF at and I'll come up with a cab design.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 31st July 2017, 11:18 PM   #19
Bobo65 is offline Bobo65  United States
diyAudio Member
 
Join Date: Sep 2011
Quote:
Originally Posted by GM View Post
You're welcome!

Well, T/S specs says too low a Qts [< 0.312] for optimal venting, hence the PR, unless driven with a high output impedance to raise it [Qts'], so ideally would be in a large compression horn.

OB will work of course, though needs a helper [sub] woofer to fill in below its upper mass corner [fhm].

fhm = 2*Fs/Qts'

Qts' = Qts + any added series resistance: http://www.mh-audio.nl/newqts.asp

What I do, recommend for these type specs is a mass loaded [vented] TL = MLTL where net volume [Vb] = Vas, tuning [Fb] = Fs, which uses a TL to mass load the vent, improving the mid-bass some and allowing extension down to Fs, a real plus if driven with a high output impedance, so......

What are you going to use up high and assuming these will be used in a HIFI app, your average seated hear height or whatever height you want the HF at and I'll come up with a cab design.

GM
Thanks again GM.

Yes, these would be for hi-fi, but I don't know what tweeter to use nor what height the tweeter ought to be. I've been thinking about this for awhile but have only cursory knowledge of speaker building. Maybe my goals are a bit unrealistic... and really not worth the trouble.

Anyway, this is what I've been thinking:

The drivers are mounted in Bolero 890-C cabinets with original horn tweeters. They are lying on their sides on bookselves with tweeters at 45 inches.

I like the sound of the speakers very much but wondering if more can be gotten from the 406... I'd like to get lower bass out of drivers, better transients, cleaner mid-range, more detailed high end (the original Heppner horns are just ok).

I have some various tweeters hanging around including a couple sets of Janszen 130U electrostatic tweeters. But, maybe the 406 would not blend well with them? Maybe they're made to go with horns only? Maybe the 2000hz crossover is not ideal?

All these questions! Is it not worth it?

Finally, when you say "driven with a high output impedence" what exactly do you mean? Non-tube?

Thanks again,
Jeff
  Reply With Quote
Old 3rd August 2017, 02:49 AM   #20
steve jones is offline steve jones  United States
diyAudio Member
 
steve jones's Avatar
 
Join Date: Mar 2002
Location: Vancouver USA
Too hot here to go to Portland this week.
  Reply With Quote

Reply


Altec 406 - 8YHide 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
tube B 406 triode dick's cleo 4 suwaned Tubes / Valves 22 27th January 2013 03:29 AM
FS: PCB Accuphase E-406 + PRE HominisNocturna Swap Meet 7 1st November 2011 10:01 PM
WTB Altec 805B and some other altec stuff:) limono Swap Meet 9 11th October 2011 07:54 PM
Altec 811B horns and Altec 414z 12" Speakers xecluded Swap Meet 0 21st September 2008 05:21 AM
Any one here using altec ? Russellc Multi-Way 27 9th March 2003 11:15 PM


New To Site? Need Help?

All times are GMT. The time now is 01:04 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki