The Internet is your friend. A quick search of Google for
"Infinity Reference 4" 3-way
turned up this -http://www.infinity-classics.de/infi...dy_rs_4_5.html
Reference Standard 4 & 5
Introduced: A: 1982 (?)
Dimensions: RS 4: 84 x 34 x 25 cm
RS 5: 74 x 34 x 25 cm
Bass: RS 4: 2 x 20 cm
RS 5: 2 x 16 cm
Mids: 1 x Polydome
Highs: 1 x EMIT
Suggested for amplifiers with: RS 4: 40-150 Watts per channel
RS 5: 35-125 Watts per channel
Frequency range: RS 4: 40 Hz - 32 kHz
RS 5: 43 Hz - 32 kHzCrossover frequencies: 600 Hz, 4000 Hz
Suggested price (pair): RS 4: 897 $
RS 5: 698 $
Including a link to a spec sheet WITH a Crossover Schematic -http://www.infinity-classics.de/infi...ical_sheet.pdf
Woofer are listed as -2x - 8" (20.32cm) Woofers with Polypropylene Cones
The spec sheet also give the Infinity part number for the woofer.
Depending on how far you want to take it, how much money you want to spend, and how much work you want to do, this might be a quick and easy solution -
Pioneer B20FU20-51D 8" Heavy Duty Poly Woofer @ $24.50 EAhttp://www.partsexpress.com/pe/showd...number=290-055
Again, replacing a speaker component is not as easy as it seems, and if you want to bring your speakers back to perfection
then a lot of speaker and box parameters need to be considered.Sorry,
I just took another look at the specs on the Pioneer speaker, and it is classified as a 6 ohms speaker, so that probably won't work for you, but it still illustrates that potential speakers are available out there.
THINGS WE MIGHT NEED TO KNOW-
We can estimate the cabinet volume from the dimensions, so that is a help.
Next, is this speaker 'ported', does it have a vent hole or tube? If it does, is it a straight tube, or does it flair at the ends. What is its diameter? What is its depth? With this information we can estimate the tuning of the cabinet, and from that assume the resonance of the speakers themselves.
Are the woofers in their own cabinet? Yes, I understand that everything is in one box, but frequently those boxes are sectioned off into separate chambers. If we are going to estimate the cabinet size, then we need to know if we can take the entire cabinet or if we have to subtract a section from it.
Also, how much money are you willing to spend. Woofer can range from $20 each to $250 each, we need to know where in that range you are.
That should give you a huge step in the right direction.