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

Wharfedale W60 crossovers
Wharfedale W60 crossovers
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 23rd January 2016, 02:37 AM   #21
Ggizzy is offline Ggizzy  United States
diyAudio Member
 
Join Date: Jan 2015
I apologise. I drew that diagram based on the good speaker with the intact 50 ohm l-pad I did it rather hurriedly this morning as we are under a heavy snow here and have been attending to other things around the house.

I will look at it again later tonight and see if I haven't misconstrued this somehow. I swear I'm not a thicko!
  Reply With Quote
Old 23rd January 2016, 03:04 AM   #22
system7 is online now system7  United Kingdom
diyAudio Member
 
system7's Avatar
 
Join Date: Aug 2008
Location: Portsmouth UK
I've been doing this stuff for about 45 years, so it comes easy. But I too was clueless when I started.

Don't forget there's many ways to skin a cat.

Click the image to open in full size.

Gilbert Briggs changed his ideas as he went along. The above is second order 10uF/0.18mH tweeter with a bass coil. From the 10" bass Melton. Now as it goes, I could improve that.
__________________
Best Regards from Steve in Portsmouth, UK.
  Reply With Quote
Old 25th January 2016, 02:18 PM   #23
Ggizzy is offline Ggizzy  United States
diyAudio Member
 
Join Date: Jan 2015
Steve,

You were correct in your assessment of my diagram! These eyes must be getting old as I absolutely missed the uninsulated wire in parallel with the inductor after the positive input terminal. I have drawn and included a revised diagram. The IN, OUT and C indicated on the L-pad are what is printed on the back of the L-pad at those positions.

I see you ended up aquiring those other speakers. Have you given them a good listen yet? How do they sound?
Attached Images
File Type: jpg image.jpg (182.6 KB, 84 views)

Last edited by Ggizzy; 25th January 2016 at 02:22 PM.
  Reply With Quote
Old 7th July 2019, 12:29 PM   #24
kennybobby is offline kennybobby
diyAudio Member
 
Join Date: Jun 2019
The circuit diagrams in post #17 and 23 are identical, and they also match the actual layout in a set of W60 speakers that i have on the bench for repairs (bad or missing solder joints on the terminal strip). You can see poor soldering in his picture (post #8) where they soldered to the rivets instead of the terminal solder loops.

The L-PAD (passive attenuation device) is actually two separate power pot windings or rheostats with separate wipers on the same shaft. The IN winding comes in at the top of 50R, and the C winding at the bottom of 400R. The separate wipers are soldered together with a piece of hookup wire and labelled as OUT.
  Reply With Quote
Old 7th July 2019, 01:35 PM   #25
kennybobby is offline kennybobby
diyAudio Member
 
Join Date: Jun 2019
For some reason i couldn't edit my post, so i want to save my measurements here.

The circuit diagrams in post #17 and 23 are identical, and they also match the actual layout in a set of W60 speakers that i have on the bench for repairs (bad or missing solder joints on the terminal strip). You can also see an example of the poor soldering in Ggizzy's picture (post #8) where they soldered to the rivets instead of the terminal solder loops.

The L-PAD (passive attenuation device) is actually two separate power pot windings or rheostats with separate wipers on the same shaft. The IN winding comes in at the top of 50R, and the C winding at the bottom of 400R. The separate wipers are soldered together with a piece of hookup wire and labelled as OUT.

The coil is wound with solid wire 18 AWG with a green plastic jacket. The inductance and ESR were measured at 120 Hz as 11884 uH and 521 mR; at 1kHz as 933 and 1253; at 10kHz as 821 uH and 6.2 R.

The capacitor is marked Dubilier Capacitor Metallized Paper, 12.0 uF +/- 20%, 150VDC WKC, and it does measure 12 uF on the LCR meter.
  Reply With Quote
Old 7th July 2019, 03:04 PM   #26
kennybobby is offline kennybobby
diyAudio Member
 
Join Date: Jun 2019
sorry for the typo, somehow missed this in posting.

Inductance at 120 Hz should be 1184 uH.
  Reply With Quote
Old 7th July 2019, 04:25 PM   #27
kennybobby is offline kennybobby
diyAudio Member
 
Join Date: Jun 2019
For the 10" bass speaker with the red magnet i measured the following:

120 hz 1313 uH 6.71R
1 kHz 1051 uH 8.44R
10kHz 587 uH 24.5R

Sorry i wanted to put this all in one post, but the editing feature prevented this...
  Reply With Quote
Old 21st September 2019, 04:08 PM   #28
kennybobby is offline kennybobby
diyAudio Member
 
Join Date: Jun 2019
Chris,
i got your PM and sent a reply back, let me know if you need any help with the circuit.
Maybe if i make enough posts i will be able to reach the edit level...?
  Reply With Quote
Old 21st September 2019, 05:31 PM   #29
kennybobby is offline kennybobby
diyAudio Member
 
Join Date: Jun 2019
Default Interior pictures

Here's a picture of the very heavy back cover showing the thickness and ports thru which it was filled with sand.

Also the interior (with wiring too short to lay open for access),

The coil, pad and cap,

and the interior of the L-PAD.
Attached Images
File Type: jpg vintage_Wharfedale_rear_cover_sand_ports.jpg (859.9 KB, 23 views)
File Type: jpg W60_internals.jpg (388.0 KB, 21 views)
File Type: jpg W60_coil_pad_cap.jpg (473.4 KB, 20 views)
File Type: jpg LPAD_internal.jpg (408.4 KB, 9 views)

Last edited by kennybobby; 21st September 2019 at 05:55 PM. Reason: add pictures
  Reply With Quote
Old 21st September 2019, 06:53 PM   #30
system7 is online now system7  United Kingdom
diyAudio Member
 
system7's Avatar
 
Join Date: Aug 2008
Location: Portsmouth UK
The one thing I always apply with loudspeakers is that we must move with the times. Don't wish to be considered a Philosopher, but really life is lived in the in the present moment!

I grew up listening to some goodish valve amplification. In the 1960's the Radford STA-25, IIRC. Considered collectable these days.

Click the image to open in full size.

Back in the day, we used analogue vinyl LP sources of music, Garrard 401 turntables and Decca London Cartridges.

TBH, speakers were basic!

Not much different from these 12" bass plus 3" cone tweeter Wharfedale Melton II, though Goodmans made similar stuff:

Click the image to open in full size.

I do assure you, that if you had a big well carpeted room and some superior LP music like Frank Sinatra with Count Basie, you could get quite swept away!

What's the joke? Nostalgia ain't what it used to be....

These days, we design on Microsoft Windows with stuff like Visaton Boxsim.

It pretty much works like the computer predicts it. And we apply much higher order filters to keep distortion down, because computers are very good at aligning phase and level. And there is a definite mathematical theory behind it. Steen Duelund figured this all out about 20 years ago. It's right.

Click the image to open in full size.

IMO, after too many years doing this, it doesn't get much better than Troels Gravesen's SEAS 3-way classic:

SEAS-3-Way-Classic

The past is dead and gone. Everything there at Troel's website is available. Now.
__________________
Best Regards from Steve in Portsmouth, UK.

Last edited by system7; 21st September 2019 at 07:19 PM.
  Reply With Quote

Reply


Wharfedale W60 crossoversHide 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
Wharfedale W60 Crossover pot Ggizzy Parts 0 23rd December 2015 09:32 PM
Wharfedale W60 Tweeters compaxa12 Multi-Way 13 11th February 2014 11:00 PM
Hi what you think about wharfedale vr300? frompie Full Range 0 5th March 2012 02:46 PM
Wharfedale dobias Multi-Way 0 16th November 2007 03:35 PM
Wharfedale 9.2 enter Multi-Way 4 14th January 2006 01:24 PM


New To Site? Need Help?

All times are GMT. The time now is 05:58 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki