[vonfilm]

I need some high efficiency speakers without crossovers to test DIY Amps in my workshop. I have gotten the idea of making some simple OB speakers out of particleboard and using an Eminence Beta 12LTA as a full range driver. I was also thinking about suspending the baffles from the ceiling with wire or cord at just below eye level and connecting them to whatever set up that I am using at the moment. I don't expect a tremendous amount of bass or the absolute highest fidelity. If it could do a good job with acoustic guitar music and female vocals I would be pretty well pleased.

Am I crazy?

[Brad]

I've thought about a similar setup for my garage, so you're not alone if you ARE crazy   

[nodiak]

I've used that driver on ob, with tweeter and sub. It's got a strong resonance that may get to you, really needs a notch filter to get smooth. Google "The Afterburner Files" , the filter is near the bottom of page. Then it is very nice for the range you're looking for.
Don

[panomaniac]

I agree with Don.  Great driver if done right.  Might be hard to do on OB alone.

[vonfilm]

Among the amps I want to use with this for testing are the Pass-DIY F1 and F2 transconductance amps. They are not supposed to do well with crossovers. Is a notch filter a crossover?

Has anyone tried these by themselves in a full range capacity.

The option is probably a Fostex 103E in a OB or simple bass reflex box. For the workshop I am looking for something cheap and easy.

[opnly bafld]

Unfortunately the Fostex 103 will not handle OB without being high passed, so no bass unless you use a helper woofer.

Lin

[nodiak]

Good question for Pass Labs forum at diyaudio.com! Spell out everything you're trying to find out and be prepared for experienced answers!
Nelson likes the Pioneer 8" FR in TL, but forget if he uses notch for those.
Small Fostex on OB with no high pass filter will turn them into paper weights.
Don

[planet10]

Something like this (in my shop)?



dave

[panomaniac]

Hey - Look at that!   I remember those. ^_^

[planet10]

Here is a more recent shot with the halloween treatment of the drivers



dave

[vonfilm]

Dave,
That is exactly what I am talking about! What kind of drivers are those? How well do they work for you?

[planet10]

What kind of drivers are those? How well do they work for you?

They are a set of Omnes 8s. They measured very well when measured at the diyFEST last summer. I have them a little close to the back wall here but they rock when i crank it. The from the ceiling is largely a place to get the baffles out of the way.

Now that i have had a chance to listen to them, and to play with treatment schemes (mostly the colour on these) they are available as clearance stock... i have a queue of other drivers to pop into the OBs.

dave

[vonfilm]

Dave,
What Single Full Range drivers would you recommend if I wanted to do something like this? I want to keep it simple and keep the cost down and have no crossovers.

[planet10]

Dave,
What Single Full Range drivers would you recommend if I wanted to do something like this? I want to keep it simple and keep the cost down and have no crossovers.

You want to keep the price down (how far down -- i might surprise you with the price of the Omnes)... some ceiling duty 8" whizzer jobs or something vintage (i might have some Philips 10s that would do the job too & who nows what else)

A set of Delco 6x9 whizzer FR from an older GM car would also be choice.

dave

[vonfilm]

Dave,
I would love to hear what you have. Please send me an email.

[fdandrews]

I have built the Nelson Pass TL speakers with the Pioneer 8" driver. I  added a helper tweeter. Great speakers, but be advised that the Pioneer speaker is no longer available. The is a replacement driver (GR something?) in the Parts Express catalog, but I have not tried it. The Pass TLs are recommended, if you can find a suitable speaker for them.

[fdandrews]

If you are interested in the Pass TL, you might want to ask about it on the Pass forum at DIY.com.