joegarcia Posted February 7, 2008 Share Posted February 7, 2008 Hi, Is it possilble to re-wire an 8ohm 8x10 cabinet to 4ohms by using series/parallel wiring? I don't know what the individual speakers are yet but does this sound plausible? Ta's Quote Link to comment Share on other sites More sharing options...
rodl2005 Posted February 7, 2008 Share Posted February 7, 2008 Sounds plausible..............................................................................possible...???? Quote Link to comment Share on other sites More sharing options...
Bigwan Posted February 7, 2008 Share Posted February 7, 2008 What impedence are the speakers? What way are they currently configured? Need to know that before you can assess if it's possible. Quote Link to comment Share on other sites More sharing options...
nash Posted February 7, 2008 Share Posted February 7, 2008 (edited) where the hell did you find a 8ohm 8x10? Edited February 7, 2008 by nash Quote Link to comment Share on other sites More sharing options...
obbm Posted February 7, 2008 Share Posted February 7, 2008 [quote name='joegarcia' post='135450' date='Feb 7 2008, 02:03 AM']Hi, Is it possilble to re-wire an 8ohm 8x10 cabinet to 4ohms by using series/parallel wiring? I don't know what the individual speakers are yet but does this sound plausible? Ta's[/quote] No. If the cab is currently 8-ohms then: If the speakers are all 4-ohm then they will get 8-ohms by having two strings of 4 speakers = 16-ohms in parallel, which brings it back down to 8-ohms. The speakers can't be 8-ohms each because you can't make 8-ohms total. If the speakers are 16-ohms then you would have two groups of 4 speakers in parallel = 4-ohms connected in series which adds up to 8-ohms. The speakers can't be 32-ohms because you can't make 8-ohms total. Quote Link to comment Share on other sites More sharing options...
Hamster Posted February 7, 2008 Share Posted February 7, 2008 [quote name='nash' post='135478' date='Feb 7 2008, 08:31 AM']where the hell did you find a 4ohm 8x10?[/quote] He hasn't - but he wants one As above, should be able to do it with re-wiring. Hamster Quote Link to comment Share on other sites More sharing options...
obbm Posted February 7, 2008 Share Posted February 7, 2008 [quote name='Hamster' post='135481' date='Feb 7 2008, 08:35 AM']He hasn't - but he wants one As above, should be able to do it with re-wiring. Hamster[/quote] Not if the cab is currently 8-ohms. There is no way to convert any 8-ohm cabinet into 4-ohms without changing the speakers. Quote Link to comment Share on other sites More sharing options...
nash Posted February 7, 2008 Share Posted February 7, 2008 [quote name='Hamster' post='135481' date='Feb 7 2008, 08:35 AM']He hasn't - but he wants one As above, should be able to do it with re-wiring. Hamster[/quote] haha sorry typo Quote Link to comment Share on other sites More sharing options...
joegarcia Posted February 7, 2008 Author Share Posted February 7, 2008 I feared this may be the case. I don't know what individual impedance the speakers are yet as I haven't bought it as yet and the current owner doesn't know either. Probably won't if he's sure it's 8 ohms. It's a 'touring' Ashdown ABM810. It looks like a normal 810 but has normal black drivers of some sort as opposed to the normal Blueline ones. 1200w as the standard ABM810s. Quote Link to comment Share on other sites More sharing options...
Hamster Posted February 7, 2008 Share Posted February 7, 2008 [quote name='obbm' post='135480' date='Feb 7 2008, 08:34 AM']No. If the cab is currently 8-ohms then: If the speakers are all 4-ohm then they will get 8-ohms by having two strings of 4 speakers = 16-ohms in parallel, which brings it back down to 8-ohms. The speakers can't be 8-ohms each because you can't make 8-ohms total. If the speakers are 16-ohms then you would have two groups of 4 speakers in parallel = 4-ohms connected in series which adds up to 8-ohms. The speakers can't be 32-ohms because you can't make 8-ohms total.[/quote] Now you say that - I've sat down with a piece of paper and I think you're right. However - if you have a stereo amp that goes down to 2 ohms AND the speakers are all 8ohm then you might be in business. Parallel wire the 8ohm speakers into 2 stacks of 4 and that will give you 2ohms on each stack. Hamster Quote Link to comment Share on other sites More sharing options...
joegarcia Posted February 7, 2008 Author Share Posted February 7, 2008 [quote name='Hamster' post='135603' date='Feb 7 2008, 11:35 AM']Now you say that - I've sat down with a piece of paper and I think you're right. However - if you have a stereo amp that goes down to 2 ohms AND the speakers are all 8ohm then you might be in business. Parallel wire the 8ohm speakers into 2 stacks of 4 and that will give you 2ohms on each stack. Hamster[/quote] Thanks but is it possible for the speakers to be 8ohm if they're wired up presently for 8ohms total? Also, my amp does do 2ohms but I wanted to be able to use it with another 4ohm cab. Quote Link to comment Share on other sites More sharing options...
obbm Posted February 7, 2008 Share Posted February 7, 2008 [quote name='joegarcia' post='135622' date='Feb 7 2008, 11:56 AM']Thanks but is it possible for the speakers to be 8ohm if they're wired up presently for 8ohms total? Also, my amp does do 2ohms but I wanted to be able to use it with another 4ohm cab.[/quote] Only if he hasn't got all the speakers wired or he's found a way to circumvent the laws of physics, in which case I doubt that he'd be a musician. This table shows all the possible permutations. Speakers__ohms_____cab posibilities (ohms) 2__________4_________2 or 8 4__________4_________1 or 4 or 16 6__________4_________0.67 or 6 or 24 8__________4_________0.5 or 2 or 32 2__________8_________4 or 16 4__________8_________2 or 8 or 32 6__________8_________1.33 or 5.33 or 12 or 48 8__________8_________1 or 4 or 64 2_________16_________8 or 32 4_________16_________4 or 16 or 64 6_________16________2.67 or 10.67 or 24 or 96 8_________16_________2 or 8 or 128 2_________32________16 or 64 4_________32_________8 or 32 or 128 6_________32________5.33 or 21.33 or 48 or 192 8_________32_________4 or 16 or 64 or 256 I wish there was an easier way of doing a table Quote Link to comment Share on other sites More sharing options...
Merton Posted February 7, 2008 Share Posted February 7, 2008 [quote name='joegarcia' post='135594' date='Feb 7 2008, 11:19 AM']I feared this may be the case. I don't know what individual impedance the speakers are yet as I haven't bought it as yet and the current owner doesn't know either. Probably won't if he's sure it's 8 ohms. It's a 'touring' Ashdown ABM810. It looks like a normal 810 but has normal black drivers of some sort as opposed to the normal Blueline ones. 1200w as the standard ABM810s.[/quote] If it has black speakers it sounds like quite an early Ashdown, or the Blueline ones have been replaced...? That may explain the 8ohms thing too! Quote Link to comment Share on other sites More sharing options...
joegarcia Posted February 8, 2008 Author Share Posted February 8, 2008 (edited) [quote name='Merton' post='135683' date='Feb 7 2008, 01:00 PM']If it has black speakers it sounds like quite an early Ashdown, or the Blueline ones have been replaced...? That may explain the 8ohms thing too![/quote] Yea, think it may well be an older one. Anyone know how the older ones compare to the newer ones? Shame I can't re-wire it. Might still be ok though, my amp can handle 2.67 ohms and I wouldn't really mind it getting less power than the other cab although it's not ideal. Edited February 8, 2008 by joegarcia Quote Link to comment Share on other sites More sharing options...
Merton Posted February 8, 2008 Share Posted February 8, 2008 [quote name='joegarcia' post='136212' date='Feb 8 2008, 12:46 AM']Yea, think it may well be an older one. Anyone know how the older ones compare to the newer ones? Shame I can't re-wire it. Might still be ok though, my amp can handle 2.67 ohms and I wouldn't really mind it getting less power than the other cab although it's not ideal.[/quote] The black speakers were Celestions, blue ones are Sica. I prefer the Celestions personally, slightly punchier sound in my experience. Last time I played an 8x10 cab was an Ashdown with the blue speakers and it was horrible, destroyed the nice bright sound of the Hartke head used to power it. Quote Link to comment Share on other sites More sharing options...
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