Monkeyman007
New Member
Question, any answers? 8 OHM Cab with 2 tweeters each 16ohm in Parallel 1 woofer 8 ohm. Tweeters shot so 2 16ohm in parallel = 8ohm can they be replaced with 2 8ohm tweeters in series = 16ohm? Hmmm
Ohms Ohms OHMS 16ohm P=8 8ohm S=16???
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guiller
Toscaninichus Australis
As far as I know, a speaker impedance figure is the average over the audible frequency spectrum of the modulus of a complex function (the impedance) that depends on frequency, effective capacity, resistance and inductance of a given speaker, treated as a black box. If we were talking about resistances, the rule is that you add the values of every component to get the total resistance value when you connect them in series, and that you add the inverse of the individual resistances to obtain the inverse of the total resistance. Eg, if you connect 2 identical resistors R in series you get 2R and in parallel, R/2.
With all the reservations implied by the above, If I understood correctly, 2 16 ohm tweeters in parallel make up for one of effective value 8 ohms. If you connect two 8 ohm tweeters in series you get 16 ohm. Would you like to use 3 tweeters, that is, take off from your speaker cabinet the 16 ohm tweeter that doesn' t work and put two 8 ohm ones connected in series in place of that, and connect these two in parallel to the remaining 16 ohm tweeter? I don' t think this is a good idea. You' ll be compromising speaker performance and kill balance between the two non-identical speakers.
With all the reservations implied by the above, If I understood correctly, 2 16 ohm tweeters in parallel make up for one of effective value 8 ohms. If you connect two 8 ohm tweeters in series you get 16 ohm. Would you like to use 3 tweeters, that is, take off from your speaker cabinet the 16 ohm tweeter that doesn' t work and put two 8 ohm ones connected in series in place of that, and connect these two in parallel to the remaining 16 ohm tweeter? I don' t think this is a good idea. You' ll be compromising speaker performance and kill balance between the two non-identical speakers.
Monkeyman007
New Member
These are Radio Shack NOVA 7b speakers. The 2 tweeters in 1 cabinet are shot and can not seem to locate any 16 ohm tweeters to replace them with. There is a set of these on ebay, although looking exactly alike, right down to the size, shape and sub enclosures they are 8 ohm not 16 ohm. guiller mentioned keeping 1 16 ohm and adding 2 8 ohm but would compromise performance, but how about 1 16 ohm with 1 8 ohm in parallel. Taking 1 tweeter from the working set replacing it with the 8 ohm, in turn each cab would have 1 16 ohm and 1 8 ohm in parallel.
guiller
Toscaninichus Australis
If you have 2 tweeters in parallel, one of 8 and another of 16 ohms, the resulting impedance (resistance) would be 8*16/(8+16) = 5.33 Ohms, instead of the 8 ohms of the original design (2 16 ohm tweeters in parallel). This means that the crossover will pump a higher current into the tweeters for the same voltage. This may or may not be a risk for them, depending on their ability to drive higher currents. On the other hand, you would have to modify your crossover to restore a balance of the intensity radiated by the tweeters versus the rest. Finally, you have to do the same for both speakers to get a balanced system. Are you sure you would like to traverse this road?
