DIY Audio Projects Forum
 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

DIY Audio Projects Forum

Welcome to the DIY Audio Projects Message Forum. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. Registration is free and required to post messages and view the file attachments. Registration will only take a minute and registered users do not see any advertisements. After you have completed the online registration process, check your email (including spam/junk folder) for the verification email to activate your account. New members are under moderation - so your posts will not be visible until approved by a moderator. See the Read Me 1st, Forum RULES and Forum FAQ to get started on the forum.

It is currently 26 Jan 2021, 23:08

All times are UTC - 6 hours [ DST ]

Post new topic Reply to topic  [ 2 posts ] 
Author Message
PostPosted: 20 Feb 2017, 03:35 

Joined: 28 Dec 2010, 22:07
Posts: 353
I've been doing this for a while. I figured I'd discuss it on here to see what other people thought.

I'll go to the thrift store and buy a speaker cabinet. You know the ones, they're made of particle board 1/4in to 1/2in (6-12mm) in thickness, usually coated in vinyl with a wood grain pattern or solid black. Sometimes I'll get bookshelf speakers and sometimes I'll get something larger. The latest one I got was larger and would normally be mounted on the floor or maybe up in the ceiling corner. It contained a 5 1/2 inch (~140mm) driver and nothing more.

I don't have a clear idea on the specs of drivers like these. Therefore, I can't rightly calculate an enclosure that will make them sound their best. That doesn't stop me from using them, however. I made a couple of small speakers in July/August that used some 4inch (~100mm) drivers and the cabinets were literally four sections of pine board mitered and glued together into a small box. Then I cut a cedar picket into a baffle and there was a speaker. They sound a bit bright but definitely not bad.

Anywho, the current driver I have (since I only have one like it) may find a spot in a guitar amplifier. I also might place it in a mono cabinet with an amplifier and low pass filter for my radio station. Amateur radio usually likes to roll off frequencies higher than 3 KHz and CW operators are much more aggressive. I haven't decided yet what I want to do with it.

The main thing I try to do is to make the cabinets out of a softer, solid wood (say, pine or cedar), thick MDF, or plywood. I figure the better box material will give the speakers a little better sound than before, where the factory has to crank out several hundred per day and cannot afford to use materials other than the absolute cheapest which will still give acceptable results.

I'm looking for opinions from speaker builders or others who have done the same thing. I'm not one of those people who have enough funds to spend $500-2000 building a pair of speakers. There are those who say I should not even try to be in audio if I'm not willing to put serious money toward it. People with that attitude will probably be ignored.



You can't have too much heat sink.

PostPosted: 21 Feb 2017, 21:05 
User avatar

Joined: 28 May 2008, 21:53
Posts: 4592
Location: Winnipeg, CANADA
When I had more time I liked to do this. But I had more luck with tube console stereos with open back style speakers. As you get to know the drivers, some are quite valuable in Asia. Look for made in Japan stuff, in Canada I had no problem finding Phillips speakers with Alnico magnets and keep an eye out for these: ... index.html

Without knowing the speaker parameters, your approach of replicating the box, but with better materials is the safest bet. Some materials from the 70s and 80s was garbage. The original boxes will seldom have adequate bracing, so that is another item to add to improve your enclosure build. If the drivers are popular, you may be able to search and find the specs to come up with a box design. Dayton also makes a simple test system for measuring the speaker parameters. It's about $100 so you will really need to use it frequently to get the value out of it.


[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 6 hours [ DST ]

Who is online

Users browsing this forum: Majestic-12 [Bot] and 6 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
DIY Tube Projects :: DIY Tube Amp Kits :: DIY Speaker Projects :: DIY Solid State Projects :: DIY IC / Op-amp Projects :: DIY Phono Projects :: DIY Cable Projects :: Hi-Fi Audio Schematics
© - Terms of Service - Privacy Policy