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I have a pair of vintage Pioneer 811A 4 way, 5 speaker, bookshelf speakers. One has a damaged 12" cone type woofer (Pioneer ID# 30-735A), the other a damaged cone type 3" tweeter (Pioneer ID# 77-178f). The cab is an 8 ohm cab with a rating of 120 watts and a 30-22kHz freq response. The crossovers are at 1,300 Hz, 10 kHz, and 10 kHz. I attached the spec sheet for this speaker if that helps.
I put a multimeter on the woofer (removed from cab)and it measured 4.4 ohms. I did the same with the tweeter and it measured 6.2 ohms. Most replacements I've seen are rated at either 4 or 8 ohms.
That said, should I buy an 8 ohm replacement 3" tweeter and a 4 ohm 12" woofer? Is it that simple? Or, am I missing something? Thank you for any advice you can give me.
Follow Ups:
To match speakers you not only need to get reasonably close on impedance but ideally you also have to get close on efficiency (how loud for a given input) and two other parameters called Q and Resonant Frequency. These last two determine how the speaker interacts with the box. In this case it's Bass reflex and looking at the impedance curve it looks like Fr is somewhere less than 70 hz. Both of those resistance measurements suggest a speaker that is nominally 8 ohms impedance. Finding a 12" woofer with 97dB efficiency and that Fr probably means a Pro Sound type of woofer is your only option. For the tweeter the efficiency number and physical dimensions are probably most important. I would look at either Madisound or PartsExpress web sites. They can advise you further. Hope this helps.
Gary
Thank you so much. You have provided me with exactly the information I had been searching.
Orange Coast Speaker in SoCal is another good one. dont just put anything in there as it wont sound the same...
The rating you see listed is nominal, more often than not will not match a measured reading.
Have you thought of getting them repaired? A link to Miller sound below. No affiliation other than being in my neighborhood.
If they can be repaired do that. I bought woofers and tweeters for my Marantz 7MkII trying to match parameters. They've never sounded the same.
Back then I had no idea drivers could be repaired, and regret that lack of knowledge.
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