Full ranger and a woofer question

[audiophile36]

Is there any problem with running a 12" woofer wide open to an Fostex Fe126e.The woofer will be in a BR box and the Fostex Fe126e will be mounted on top of the woofer box in an open baffle...do I need a crossover?

[planet10]

An XO will be needed to get the most out of them

dave

[audiophile36]

Thank's Dave,

What kind of crossover should I use...I want to keep the Fe126e crossoverless?

[hm]

Hello,

look the xmax of the Fostex,
try a closed box and cut 6dB ~300-400 Hz,
i don´t think an OB is a good idea for the 126.

If you take two of them you can build a horn
and you don´t need a bass.

Look my KORNETT

[Scottmoose]

It'll depend on the woofer you select. You should be able to leave the 126 alone & let the woofer handle the LF to an extent, although it's not ideal.

FWIW, I'd do roughly what Martin does on his 2 way OBs; simple 2nd order circuit; high pass the 126 at 500Hz & low pass the woofer at 200Hz, both of which are typically good points to place an XO.

[cabbagerat]

Originally posted by audiophile36
Thank's Dave,

What kind of crossover should I use...I want to keep the Fe126e crossoverless?

Have you considered bi-amping? One of my systems is a similar setup (FE167E, though), with 4th order active Linkwitz-Riley crossovers before the amplifiers. Bi-amping is more expensive and complex, but does have many benefits - you should seriously consider going this way.

If you don't want to biamp, then I think hm is right - you should consider putting the fostex in a small sealed box to roll it off, and cross the woofer in at the right frequency. Getting the phase and crossover curves right for such a setup will require some careful design.

[Scottmoose]

It occured to me earlier, why a BR for the woofer? If you don't have the drivers already, I'd probably just go for Martin's 2 way (well, FR + woodfer) OB, or a variation on that. It won't lack for LF output, and the Eminence Alpha 15 isn't a pricey unit.

[audiophile36]

Originally posted by Scottmoose
It occured to me earlier, why a BR for the woofer? If you don't have the drivers already, I'd probably just go for Martin's 2 way (well, FR + woodfer) OB, or a variation on that. It won't lack for LF output, and the Eminence Alpha 15 isn't a pricey unit.

I want to go all OB but don't know how to cut holes larger than 6" because they don't make hole cutters larger than 6". I have a jig saw,but I don't know how to start a cut when trying to cut out a circle.

[Scottmoose]

Wouldn't that affect a 12in woofer in a box too?

I'm about the last person to ask in-re woodwork, but there are plenty of knowledgeable people here who'll be able to help you out. Make or buy a circular jig for your router would be favourite I imagine.

[germpod]

My driver holes are not perfect, but I just drill a hole on inside of the circle so the jig saw blade can get in and cut from there.