This may seem too obvious but is it possible to add a resistor in series to increase the overall resistance of the woofer?
Cone impedance question
I own pair of nice 2.5 way, 4 ohm floorstanders and recently destroyed the 2 woofers on one of them. The story would be too long so I'll spare you.
Since no replacement parts are available (per the US Distributor) I had the bright idea of acquiring a used pair of the matching 2 way bookshelvers which also feature the "same" 5 1/4" cone, with the intent of canibalizing those cones to fit in my broken floorstander. I found out the "same" is not quite.
The cones are almost identical physically, those removed from the bookshelves have a cover over the magnets that I assume are a magnetic shield but the fundamental difference is impedance. The broken ones are labeled as 7.2 ohm, while the replacements are 3.6 ohm.
While installing I have balanced the cones so each floorstander has one 7.2 ohm and one 3.6 ohm cone, rather than one speaker (original) with two 7.2 ohm and the repaired with two 3.6 ohm cones.
When listening I am not noticing any differences, but then I haven't listened to these speakers for over a year.
I am looking for comments on potential implication. For example
Javier
Since no replacement parts are available (per the US Distributor) I had the bright idea of acquiring a used pair of the matching 2 way bookshelvers which also feature the "same" 5 1/4" cone, with the intent of canibalizing those cones to fit in my broken floorstander. I found out the "same" is not quite.
The cones are almost identical physically, those removed from the bookshelves have a cover over the magnets that I assume are a magnetic shield but the fundamental difference is impedance. The broken ones are labeled as 7.2 ohm, while the replacements are 3.6 ohm.
While installing I have balanced the cones so each floorstander has one 7.2 ohm and one 3.6 ohm cone, rather than one speaker (original) with two 7.2 ohm and the repaired with two 3.6 ohm cones.
When listening I am not noticing any differences, but then I haven't listened to these speakers for over a year.
I am looking for comments on potential implication. For example
- I have changed the total impedance of the speakers. Am I now at less than 4 ohm?
- Any one know of any obvious sound implications? I would assume the voicing of the cones would be the same even though the impedance difference.
Javier
7 responses Add your response
Eric, thanks for the advice, actually that is exactly what I was attempting and my mistake was to think the woofer for the 2 way model would be identical to those on the 2.5 way model. I am back to square one in my search for replacement woofers for an Epos Epic 5.... Alson thanks to jb0194 and to elevick for your feedback. |
http://businessfinder.pennlive.com/7275198/TriState-Loudspeaker-ReConing-Aliquippa-PA Tri State Loudspeaker outside of Pittsburgh can rebuild virtually any speaker. They are not fast and usually inexpensive. They get shipments from all over the world, including NASA. Kind of crazy work they do for a tiny little shop run out of a home. I've seen them rebuild mega bucks subwoofer columns for live venues and then turn around and work on vintage AR speakers. |
I'm going to give you advice you will not take. This happens at work often too. The hardest thing newbies do is try to replace a woofer for an existing speaker, while keeping everything else the same. It is nearly impossible to do well. Of course, if you find identical parts, that's not the issue. You are far better off spending more time looking for identical replacements. Either by hitting up the DIY boards where someone may recognize the driver and model, or as you alluded, going to e-bay and looking for replacements or other speakers to cannibalize. It is far far easier to build a new speaker from a kit, or even learning to design a 2-way/3-way speaker from scratch, than it is to take any existing design and find a replacement woofer for it without also knowing how to change the crossover. Best, E |