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Save money, build your own speakers

altruistic.lemon

New member
Jul 25, 2011
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At least, that's what I thought. I'm pretty good with my hands, having knocked the odd book case together, can saw a straight line, so why not? You've got to give it a go, after all. The aim was for bookshelf speakers for the study/bedroom.

Read up a bit, decided on something the small Harbeth size, found it was based on the BBC LS/3a, read up about that, found a suitable (I hope) tweeter and woofer, bought some three ply and off I went. Well, not quite, had to design the crossover, but there's lots of programs for that on the net, so went 2nd order Linkwitz-Riley because they're a flat frequency response.

The saving money bit is already out the window. The speakers cost £200, the wood £25, the crossover £150, then there's screws, glue, routers, jigsaw, varnish - I'm already up for £500 and have no idea what they'll sound like. The aim is a Harbeth like sound, by the way.

Chose sealed box because it seemed easier than ported. That means precision box building, don't have the proper tools over here so, though the boxes are pretty good, airtight they weren't which meant sealing. It also means that until the last screw is in place I'm not going to know whether I did good or bad. Apparently you can tweak crossovers, but with a sealed and glued box, that's not going to be so easy.

To-night's the night, anyway. Just waiting for the sealant to dry, then I'll do the final bit of soldering and put the baffle in. It's either going to be a "told you so" or champagne.
 

tyranniux42

New member
Jun 23, 2010
18
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0
Good luck with the venture!

would love to do something like this myself but that would mean having to do away with my 602's which I love and will never get rid of!

Let us know how you get on
 

FennerMachine

New member
Feb 5, 2011
83
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0
I couldn't be bothered with the time and hassle!

I would much prefer someone else to do the hard work of testing/tweaking to get good sounding components and speakers. The amount of time, research and experience involved...

On the other hand part of the fun in some hobbies such as model planes and train sets is in the making of them and the design you put in yourself.

Hope they sound good, and if not you could reuse the parts, just make a new enclosure.
 
A

Anonymous

Guest
altruistic.lemon said:
At least, that's what I thought. I'm pretty good with my hands, having knocked the odd book case together, can saw a straight line, so why not? You've got to give it a go, after all. The aim was for bookshelf speakers for the study/bedroom.

Read up a bit, decided on something the small Harbeth size, found it was based on the BBC LS/3a, read up about that, found a suitable (I hope) tweeter and woofer, bought some three ply and off I went. Well, not quite, had to design the crossover, but there's lots of programs for that on the net, so went 2nd order Linkwitz-Riley because they're a flat frequency response.

The saving money bit is already out the window. The speakers cost £200, the wood £25, the crossover £150, then there's screws, glue, routers, jigsaw, varnish - I'm already up for £500 and have no idea what they'll sound like. The aim is a Harbeth like sound, by the way.

Chose sealed box because it seemed easier than ported. That means precision box building, don't have the proper tools over here so, though the boxes are pretty good, airtight they weren't which meant sealing. It also means that until the last screw is in place I'm not going to know whether I did good or bad. Apparently you can tweak crossovers, but with a sealed and glued box, that's not going to be so easy.

To-night's the night, anyway. Just waiting for the sealant to dry, then I'll do the final bit of soldering and put the baffle in. It's either going to be a "told you so" or champagne.
Are you well insured ? :)
 

Rob998

New member
Nov 19, 2008
6
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0
I must admit, i do quite fancy doing this, building a 3 way speaker but dispensing with the passive crossover & tri-amping with an active crossover in my rack.

The problem is, I would then get carried away & end up with 7 amps, a pre & 6 powers, feeding individual drivers! Jeez, can you imagine the amount of wires!

It's never going to happen if I'm honest with myself, but a nice little thought experiment nontheless!
 

chebby

Well-known member
Jun 2, 2008
1,232
4
19,195
I assume you have pulled the original design report from the BBC's R&D archives...

http://downloads.bbc.co.uk/rd/pubs/reports/1976-29.pdf

...I know things have changed a lot (unavailability of the specific KEF B110/T27 variants originally used etc.), but the cabinet dimensions are all there along with crossover diagram and instructions on damping and sealing and materials.

Fascinating reading anyway.

Good luck with them.
 

Inter_Voice

New member
Oct 5, 2010
62
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0
Hope you can suceed and awaiting to hear your outcome. Twenty years ago I did similar DIY as yours but the result was not satisfactory :cry:
 

CnoEvil

New member
Aug 21, 2009
556
8
0
altruistic.lemon said:
To-night's the night, anyway. Just waiting for the sealant to dry, then I'll do the final bit of soldering and put the baffle in. It's either going to be a "told you so" or champagne.
You certainly don't want to end up with a "Lemon". :oops:

Here's hoping....
 

altruistic.lemon

New member
Jul 25, 2011
64
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0
@Chebby, yes, thanks, studied those closely and used their cabinet construction. The crossover couldn't use - made for the Kef drivers that don't exist any more (I substituted SEAS and Monacor) plus was 11/15 ohm so substituted the Linkwitz/Riley.

@cno - :cheers:

@ben law will do, but slight complicating factor - the cold has slowed the sealant curing :wall: .

@ everyone else - cheers for the support :)
 

Diamond Joe

Well-known member
Mar 1, 2008
88
6
18,545
rob998 said:
Jeez, can you imagine the amount of wires!
Oh Lord, the very thought sends a cold chill down my spine - just tidied mine up - not a fan of many/messy wires.

Good luck with your project altruistic.lemon, and I'd like to see some piccies too, cheers. :clap: :)
 

SteveR750

New member
Mar 11, 2005
458
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Even iof they don't work, well done for trying. I thought about a Wharfedale Denton kit years ago, and didn't have the courage as I don't have the patience to make anything other than a nuisance. Finers crossed! Show us some pics by the way, and what drivers did you fit?
 
A

Anonymous

Guest
An old school mate of mine is now designing and building speakers, presumably the construction is outsourced to a company that has the skills to make these well as I would guess they're a tad more diffcult to make that traditional box speakers!

 

paradiziac

New member
Jan 8, 2011
17
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0
I've seen those speakers somewhere, retail about 4-5K IIRC?

Seems rather expensive since the Jordan full range driver does away with the crossover.
 
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Anonymous

Guest
About £4k I believe. They're Curvi-hifi Model 1 Version 2 speakers. I have no idea how many have been sold, I would have thought quite a low number.
 

kevinJ

New member
Nov 2, 2008
51
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0
DIY speakerbuilding is great. But why did you think you could save money that way? If you want to make good quality speakers, you'll end up spending more than the cost of a big brand speaker pair.

Make sure you make the crossover small/compact enough so you can remove it through the bass/midrange driver's cutout hole when you need to make adjustments. Use high quality solder to connect all the crossover components.

I guess you already figured out how to calculate the box's internal volume according to the speaker's specs?

Dips or peaks in the frequency range can be flattend by installing a compensation circuit and you might want to check the phase shift too. Oh and also check for impedance equalisation (Zobel circuit).

And don't forget the pictures!
 

CnoEvil

New member
Aug 21, 2009
556
8
0
altruistic.lemon said:
To-night's the night, anyway. Just waiting for the sealant to dry, then I'll do the final bit of soldering and put the baffle in. It's either going to be a "told you so" or champagne.
Was that a Champagne cork I heard, or your ego hitting the floor? ;)
 

altruistic.lemon

New member
Jul 25, 2011
64
0
0
At work, only heard for a couple of minutes. Treble a bit forward, but otherwise detailed, low bass missing but they're small. More tomorrow.
 

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