Clarky Posted February 7, 2012 Share Posted February 7, 2012 Is it possible to stack a 4ohm and an 8ohm cab and run from an amp that goes down to 2 ohms (like my Acoustic Image Clarus+)? Also, I presume it definitely wouldn't work with an amp that only goes to 4 ohms (eg, Markbass F1)? I'm sure its in the Wiki somewhere but there are 127 replies on the impedance thread and life is too short ...! Quote Link to comment Share on other sites More sharing options...
molan Posted February 7, 2012 Share Posted February 7, 2012 I think 4 ohms plus 8 ohms together is going to give you around 3 ohms combined. Quote Link to comment Share on other sites More sharing options...
Clarky Posted February 7, 2012 Author Share Posted February 7, 2012 Thanks Barrie. I presume that means it might work with a 2ohm head but not a 4 ohm ... or do the little b*ggers only work in multiples of 2 ohm? lol. i really am an electronics numptie! Quote Link to comment Share on other sites More sharing options...
icastle Posted February 7, 2012 Share Posted February 7, 2012 4Ω + 8Ω = 2.67Ω (in parallel). So you can use that combination of cabs on your head that goes down to 2Ω, but not on the head that goes down to 4Ω. Quote Link to comment Share on other sites More sharing options...
Gwilym Posted February 7, 2012 Share Posted February 7, 2012 [quote name='Clarky' timestamp='1328651649' post='1530811'] Is it possible to stack a 4ohm and an 8ohm cab and run from an amp that goes down to 2 ohms (like my Acoustic Image Clarus+)? Also, I presume it definitely wouldn't work with an amp that only goes to 4 ohms (eg, Markbass F1)? I'm sure its in the Wiki somewhere but there are 127 replies on the impedance thread and life is too short ...! [/quote] you'll get a power mismatch as well, even if your amp does handle a 2.7ohm load, i.e. the 4ohm cab will be louder - assuming the cabs are the same sensitivity - which in this case I think they are? Quote Link to comment Share on other sites More sharing options...
Clarky Posted February 7, 2012 Author Share Posted February 7, 2012 Hmmm good point about power mismatch. Think I'll give my scheme-y type scheme a miss! Thx gents Quote Link to comment Share on other sites More sharing options...
Gwilym Posted February 7, 2012 Share Posted February 7, 2012 [quote name='Clarky' timestamp='1328655845' post='1530896'] Hmmm good point about power mismatch. Think I'll give my scheme-y type scheme a miss! Thx gents [/quote] but you'd get around the mismatch by using 1 amp per cab, and slaving one amp from the other, then you can match the individual cab volumes with the master volume of each amp. Quote Link to comment Share on other sites More sharing options...
Clarky Posted February 7, 2012 Author Share Posted February 7, 2012 Trouble is I want a neat one-hand lift mini- rig rather than a team of roadies and electricians!!! Quote Link to comment Share on other sites More sharing options...
chris_b Posted February 8, 2012 Share Posted February 8, 2012 What cabs? A 4 ohm 212 and an 8 ohm 112 will give all speakers the same power so will not be a mismatch. If you're putting a 4 ohm 112 and an 8 ohm 112 together they will receive different levels of power, but at your volume levels I doubt it would be too noticeable. [font=Arial][size=2] [/size][/font] Quote Link to comment Share on other sites More sharing options...
Clarky Posted February 8, 2012 Author Share Posted February 8, 2012 I have an 8 ohm 2x10 (Acme Low B2) and was considering pairing it with a second 2x10 Low B2 which is 4 ohm (the latter is FS on BassChat, hence thinking about it) Quote Link to comment Share on other sites More sharing options...
chris_b Posted February 8, 2012 Share Posted February 8, 2012 Could you email Andy at Acme? I would happily put 4 and 8 ohm cabs together if they were from the same line and same form factor. In my case I'm looking for an AE212 to put with my AE112. I can't see that a 4 ohm 210 drawing 2/3rd and an 8 ohm 210 drawing 1/3rd of the power from the amp will be noticeably out of balance. Quote Link to comment Share on other sites More sharing options...
Clarky Posted February 8, 2012 Author Share Posted February 8, 2012 I've dropped Acme an email and will let you know what they say Quote Link to comment Share on other sites More sharing options...
Clarky Posted February 8, 2012 Author Share Posted February 8, 2012 (edited) [size=3][font=comic sans ms,cursive][font=Arial][font=Arial]Andy from Acme's reply:[/font][/font][/font] [font=comic sans ms,cursive][font=Arial][font=Arial]Sorry- I don't have a good answer. If you connect the two cabs in parallel (daisy chained), the 4 ohm cab will receive 2/3 of the power, and the 8 ohm cab will receive 1/3 of the power. So, to use your word, it would be a mismatch.[/font][/font][/font] [font=comic sans ms,cursive][font=Arial][font=Arial]The best way to use the two together would be to use a stereo power amp, use the amp's level controls to balance the two.[/font][/font][/font][/size] Edited February 8, 2012 by Clarky Quote Link to comment Share on other sites More sharing options...
KennysFord Posted February 9, 2012 Share Posted February 9, 2012 Nice one Clarky, I was wondering the same. I asked a couple of weeks back about running a bi amp system as my cabs are mis matched at the moment. The tumbleweed was very apparent. You did better than I did bud. Quote Link to comment Share on other sites More sharing options...
aldude Posted February 10, 2012 Share Posted February 10, 2012 [quote name='chris_b' timestamp='1328662824' post='1530981'] What cabs? A 4 ohm 212 and an 8 ohm 112 will give all speakers the same power so will not be a mismatch. If you're putting a 4 ohm 112 and an 8 ohm 112 together they will receive different levels of power, but at your volume levels I doubt it would be too noticeable. [/quote] This!!! I use a Barefaced Compact (8 ohm) 1x15 and Super 12 (4 ohm) 2x12. So, 2/3 of the power goes to the S12, but this is divided between the speakers. So, all three speakers get 1/3 of the power - I guess it's as if I used three 8 ohm cabs, 1x15, 1x12 and 1x12. I don't see a mismatch here! And I certainly don't hear one. Quote Link to comment Share on other sites More sharing options...
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