replacing fisher ds-811's

[timmay34]

I'm planning on replacing the drivers in an old fisher cabinet. The speakers are 3-ways with cutouts for an 8" sub, and 4" mid, and a 3" tweet. The internal volume of the box is 1.54 cu. ft. with a 5 inch long 1 3/4" diameter round port. The box is made of 1/2 inch wood, hard to tell what it is but I think it might just be plywood, and is in very good consition. I'm on a relatively tight budget, and was planning on using

Dayton Classic 8" http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=295-310

Re 6.80 [ê ]
Fs 32.86 [Hz]
F1 21.75 [Hz]
F2 48.70 [Hz]
Zm 52.31 [ê]
D 162.00 [mm]
Qms 3.43
Qes 0.51
Qts 0.45
Bl 11.49 [N/A]
L1K 3.01 [mH]
L10K 1.07 [mH]
Ms 48.19 [g]
Vas 28.87 [l]
dBSpl 85.66 [dB]
Cms 0.49 [mm/N]
Ma 48.00 [g]
FsMa 23.26 [Hz]

tang band 1" fabric dome http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-800

maybe the audax 4" midbass found here http://www.madisound.com/cgi-bin/index.cgi?cart_id=3584188.17924&pid=1755

FS: 68.26 Hz
QMS: 2.4
xmax: 2mm each way
Qes: .44
Qts: .37
Re: 6.38 Ohms
nominal impedance: 8 ohms
power handling: 40 watts

None of these drivers are ordered yet and I'm open to new suggestions. I would have loved to use the existing crossover and wiring, however the old tweeter is a 4 ohm driver and I don't know what the rest of the speakers are. I am going to need a new crossover and I have no experience with them. Any help designing the crossover network would be appreciated, as well as input on the aforementioned drivers. Thanks in advance for your help.

[95Honda]

Give me a few days and I'll put together some component values you can use as a starting point.

Welcome to Force!

[timmay34]

Thanks I really appreciate the help

[95Honda]

I didn't forget, just been really busy. Give me a few more days....

[timmay34]

No problem Im in no hurry. Just spent some money on a new pair of grado headphones so i gotta save just a little bit more before I attack this project.

[95Honda]

Here is what I came up with after running a few things through the computer. It is a pretty simple design and should sound pretty good. It will at least give you a good starting point.....

Note the polarity of the mid is reversed, you can try it both ways, but this will sound the best....

Don't worry about the slight roll-off in the upper mid/low treble.... This is what you aim for most of the time....

[timmay34]

Wow, thanks a lot for your help. For now, my only other question are A) what would the overall power handling of this setup be?
B) what is the load that is seen by the amp?

[95Honda]

The impedabce doesn't really drop below 7 ohms, with a 15 or so ohm peak at the woofer's resonance (This will mainly be affected by you enclosure)

Power handling? Figure around 100 or so watts would be all you'd want....