Bloc Riff Nut Posted July 19, 2019 Share Posted July 19, 2019 Thats it really. My valve amps lowest speaker input is 8 ohms. Im using a 12ohm 2x10 and an 8 ohm 2x10 and the amp is at half volume. Will this bugger the amp? Its an old Marshall. Cheers Phil Quote Link to comment Share on other sites More sharing options...
goingdownslow Posted July 19, 2019 Share Posted July 19, 2019 The 12Ω and 8Ω cabs in parallel will give you 4.8 Ω. Quote Link to comment Share on other sites More sharing options...
paul_5 Posted July 19, 2019 Share Posted July 19, 2019 Short answer is yes, a load of less than 8ohms will knacker your amp. Running the 2 cabs in series will give your amp a load of 20ohms, so it’ll be safe, can’t guarantee it being loud though. Quote Link to comment Share on other sites More sharing options...
Bloc Riff Nut Posted July 19, 2019 Author Share Posted July 19, 2019 Of course it is. Ouch! Quote Link to comment Share on other sites More sharing options...
Bill Fitzmaurice Posted July 19, 2019 Share Posted July 19, 2019 Again? Really? Wasn't this addressed less than 48 hours ago, as well as in the sticky? OK, one more time, with feeling: SS amps have a minimum load, valve amps have a maximum load. Run an SS amp with a load equal to or higher than its minimum load rating, run a valve amp with a load equal to or less than the tap rating. 1 Quote Link to comment Share on other sites More sharing options...
Bloc Riff Nut Posted July 19, 2019 Author Share Posted July 19, 2019 Oh, so the Marshalls Super Bass can take the 4.8 ohm load: I just have to be aware that its working hard and use my ears. Quote Link to comment Share on other sites More sharing options...
fretmeister Posted July 19, 2019 Share Posted July 19, 2019 Bookmark this calculator! http://www.speakerimpedance.co.uk/?act=two_parallel&page=calculator Quote Link to comment Share on other sites More sharing options...
barkin Posted July 19, 2019 Share Posted July 19, 2019 (edited) 52 minutes ago, paul_5 said: Running the 2 cabs in series will give your amp a load of 20ohms, so it’ll be safe, can’t guarantee it being loud though. Trouble with this though, is that the cabs will almost certainly be in parallel - not series. Edited July 19, 2019 by barkin . Quote Link to comment Share on other sites More sharing options...
Bill Fitzmaurice Posted July 19, 2019 Share Posted July 19, 2019 (edited) He has a valve amp. He does not want his cabs series wired. He does not want a 20 ohm load. Edited July 19, 2019 by Bill Fitzmaurice 1 Quote Link to comment Share on other sites More sharing options...
Phil Starr Posted July 19, 2019 Share Posted July 19, 2019 Listen to Bill. That is correct. Are you sure it is a 12 ohm cab? Most drivers are 8 ohm with 4 and 16 being the main alternatives. I'd expect a 2x10 to be 4 or 8 ohms, maybe 16. In any case using cabs of differing impedances means the power will be shared unevenly between them. You won't be getting the best out of them. Quote Link to comment Share on other sites More sharing options...
Bloc Riff Nut Posted July 19, 2019 Author Share Posted July 19, 2019 Its a barefaced Retro210 which is switchable between 4 and 12 ohms. I just added the 4 ohm SWR 210 because I wanted more volume. I know the power isn't being shared equally. Quote Link to comment Share on other sites More sharing options...
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