Members Jazzer2020 Posted October 13, 2015 Members Share Posted October 13, 2015 I am looking into possibly replacing the stock speakers (2x10") with something else. The manual says the speakers are rated at 4 ohms.Yet I see people replacing them with speakers such as the Eminence Legend 1028k's which are 35W 8 ohm. Other 8 ohm speakers also.How can you replace a 4 ohm speaker with an 8 ohm one? Thanks! Link to comment Share on other sites More sharing options...
Members onelife Posted October 13, 2015 Members Share Posted October 13, 2015 I'm not so sure the speakers are 4 Ohms. I suspect that, like a Twin Reverb, the amplifier's output impedance is 4 Ohms and the speakers are 8 Ohms each for a combined impedance of 4 Ohms (when connected in parallel). Link to comment Share on other sites More sharing options...
Members moogerfooger Posted October 13, 2015 Members Share Posted October 13, 2015 this ^^^^^^^^^ Link to comment Share on other sites More sharing options...
Members Jazzer2020 Posted October 13, 2015 Author Members Share Posted October 13, 2015 I'm not so sure the speakers are 4 Ohms. I suspect that, like a Twin Reverb, the amplifier's output impedance is 4 Ohms and the speakers are 8 Ohms each for a combined impedance of 4 Ohms (when connected in parallel). Thanks Mooger and onelife for the info! Link to comment Share on other sites More sharing options...
Members DeepEnd Posted October 13, 2015 Members Share Posted October 13, 2015 Since onelife has answered the impedance question, the stock speakers are Jensen Oxford 10K5's: http://ampwares.com/amplifiers/767/. You can do a search for suitable replacements. What don't you like about the existing speakers? Link to comment Share on other sites More sharing options...
Members onelife Posted October 13, 2015 Members Share Posted October 13, 2015 from the link DeepEnd posted above... "The hugest improvement on sound was when I put a pair of new 10 inch Eminence 1028-K, [ALNICO], speakers in it… It was as if I took a thick wool blanket off it." Link to comment Share on other sites More sharing options...
Members DeepEnd Posted October 13, 2015 Members Share Posted October 13, 2015 ^ Which may be true for the guy (Rod Parsons) who posted that but not necessarily for the OP. A pair of Eminence 1028-K will set you back about $180 (http://www.parts-express.com/eminence-legend-1028k-10-guitar-speaker-35w-8-ohm--290-473) so if you feel like experimenting go for it. Link to comment Share on other sites More sharing options...
Members Jazzer2020 Posted October 14, 2015 Author Members Share Posted October 14, 2015 Since onelife has answered the impedance question' date=' the stock speakers are Jensen Oxford 10K5's: http://ampwares.com/amplifiers/767/. You can do a search for suitable replacements. What don't you like about the existing speakers?[/quote'] Good question! I don't have anything against them per se. I have reached the stage (of a noise detection problem) where I am simply thinking of any and all possibilities. I have ruled out patch cords, dirty pots, jacks etc., and all tubes so far. I started to think of the possibility that the speakers might have become compromised somehow. It doesn't really make sense though, since the sound breakup noise started a year or two ago, wasn't there before and I haven't moved the amp out of the house in all this time to put the speakers in any harm's way. I don't have the expertise to diagnose the insides of the amp so I will likely just have to bite the bullet and get the amp repaired by a pro. But if I go that route, I suspect the cost to repair it will be quite high. For starters, sometimes it takes minutes, (10, 20 or more) before the symptoms start/and or get really out of hand. Link to comment Share on other sites More sharing options...
Members DeepEnd Posted October 14, 2015 Members Share Posted October 14, 2015 My gut is telling me it's not the speakers but that's all I can say. Good luck finding the source of the noise. Link to comment Share on other sites More sharing options...
Members onelife Posted October 14, 2015 Members Share Posted October 14, 2015 Do you have access to a speaker cabinet that you can try for comparison? Link to comment Share on other sites More sharing options...
Members Jazzer2020 Posted October 14, 2015 Author Members Share Posted October 14, 2015 Do you have access to a speaker cabinet that you can try for comparison? I have only one, but don't think I can use it based on the amp's ohm requirements. I have a Fender Princeton II that uses an 8 ohm 12" speaker. I separated the amp into head and cabinet last year so I have the 12" speaker. (the Vibroverb was also separated at the same time). The Vibroverb is looking for 4 ohms so it probably wouldn't work. I could rent a speaker for a day if required. Link to comment Share on other sites More sharing options...
Members onelife Posted October 14, 2015 Members Share Posted October 14, 2015 I suggest testing with another speaker system as a way to help with the "noise detection problem" you alluded to earlier. You would be okay running the Vibroverb into 8 Ohms for a short time at a reasonable volume. I wouldn't suggest running the amp full out for a three hour gig into the wrong impedance but you could use your Princeton cabinet for a test. Link to comment Share on other sites More sharing options...
Members DeepEnd Posted October 14, 2015 Members Share Posted October 14, 2015 If you're truly worried, Radio Shack will sell you an 8 Ohm 20 Watt resistor for around $3: http://www.radioshack.com/8-ohm-non-inductive-resistor/2710120.html. You could wire it in parallel with the speaker from the Princeton to get 4 Ohms. However, as onelife said, it won't hurt your Vibroverb to run it into 8 Ohms briefly. Again, my gut is saying it's not the speaker but this way you can be sure. Link to comment Share on other sites More sharing options...
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