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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: RE: "Find similar replacement" - don't do that posted by villastrangiato on July 15, 2012 at 18:39:49:
I agree a full reverse engineering is do-able and if I had them sitting here I would:a) Measure all drivers for DCR
b) Measure tweeter acoustic response or failing that, use the ADS tweeter copy (Peerless 810665) response curve to get a theoretical response after applying the theoretical transfer function of the crossover using modelling. (Components not listed can be measured on the bench).
c) Determine Fc point, crossover order, filter Q, etc.
d) Attempt to reverse-engineer the woofer raw response based on the transfer function of the lowpass filter and the measured DCR. If no DCR available (multiple coil shorts or open circuits) then one could use the tweeter transfer function to generate the driver nominal impedance based on "what makes sense" for a give crossover topology and component values. (The LP and HP circuits should point to a driver impedance, and what the curve of that midwoof looked like).
e) Oh. Of course. Get relative polarity of drivers if possible. Could be an essential clue.Failing that, one could do a "best guess" attempt based on him getting as much data as possible. In addition to enclosure volume,
a) DCR info on one or both tweeters would help.
b) circuit diagrams of LP/HP filters with values would obviously help.This COULD get him a plop-in-the-box "there I fixed it" driver but you'd be making some assumptions that go beyond the unknown raw woofer response:
- Impedance rise (bump not as critical as with tweeter)
- Woofer sensitivityThe big question is: Does this guy want flat response? Or will "anything that makes some noise" give him satisfaction for the "peanuts" he has invested?
Cheers,
Presto
Edits: 07/15/12
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- RE: "Find similar replacement" - don't do that - Presto 19:49:11 07/15/12 (0)
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