Cheap small fullrangers for junkbox amp

[thevoice]

I have just built a RH84 style amp in a most electrically horrifyingly dangerous way on my workbench.

I've made this for somewhere south of $20 total in parts, so it's a bit of a junkbox special. The idea is that it is a small cheap amp for the computer or the dining room. Because of where I got most of the big parts (a 1950's stereo radiogram in very bad repair, for $11) I have discovered that the output transformers absolutely will not talk to any speaker below 16 ohms. I have tried my 8 ohm studio monitors and to say the sound is on the far side of revolting is something of an understatement, with those speakers the amp gives horrendous IMD, no midrange and fairly strange sibilance. I have a couple of 16 ohm eliptical fullrange speakers that indicate that the amp sounds pretty damn good, even getting to spookily good. They lack a whole lot in refinement and everything from lower mids down sounds kind of rubbish.

Which brings me to the point of my post. I'm after cheap, with the emphasis on cheap, half decent fullrange drivers that are small and half decent. If I have to use two per box to hit 16 ohms per channel that is fine, though I'll take recommendations on configuration. I don't want to spend several times the value of the amp, though a couple of multiples is ok. High efficiency would be good.

I'm better at cabinetmaking than I am electronics, and I'm better at electronics than I am speakers, so "odd" cabinets are a possibility, but I'll need advice.

What I'm after is the driver everyone calls "surprising".

Any recomendations?

[Geek]

EL-70?

EL70s have arrived!!

http://www.creativesound.ca/details.php?model=EL70

Cheers!

[thevoice]

Cheers, they look pretty interesting, though they are a 4 ohm driver, meaning I'd have to run four per cabinet to make a driveable load for the amp. That puts the price somewhere out of range for this project. I'll probably need an 8 ohm driver at a minimum.

[Bigun]

In terms of 'inexpensive' I'm looking at these...


http://www.madisound.com/catalog/pro...oducts_id=1502

and


Fountek FR88-EX

[renfrow]

I bought a bunch of these to play around with, and am building a box right now. A sealed bipole speaker of these would be doable, I think , in under 10l.

Tom.

[thevoice]

Originally Posted by renfrow

I bought a bunch of these to play around with, and am building a box right now. A sealed bipole speaker of these would be doable, I think , in under 10l.

Tom.

Well, they certainly meet the cheap criteria. How do they sound? They state extension to 16k, which is about where I can hear to, but I imagine it tapers off a bit before that. How do you find the extension?

[tinitus]

Dont know if this small Vifa is real fullrange, but interesting small low priced driver
It even has a copper cap on polepiece

http://www.madisound.com/catalog/pro...oducts_id=8403

[PeteMcK]

http://darcheraudio.com.au/store/ind...products_id=94

http://www.soundlabsgroup.com.au/p/V...RS+8+M+-+8+Ohm

[Bigun]

you might also look here, this guy has measured a number of full-range drivers and has some commentary on them in terms of quality and value for money.


http://www.zaphaudio.com/

[wirewiggler]

You might take a look at these Pioneer BU20F20-51F. Good write by Nelson Pass http://www.passdiy.com/pdf/cs-amps-speakers.pdf good bang for your buck.

Bill