tkelly150 Posted May 20, 2023 Share Posted May 20, 2023 I have a 4ohms head. And 2 / 8 ohm’s cabinets. Can I hook them both to the head or not ? Quote Link to comment Share on other sites More sharing options...
BassAdder60 Posted May 20, 2023 Share Posted May 20, 2023 Yes if your amp head is rated to 4 ohms you can connect two 8 ohm cabs in total 1 Quote Link to comment Share on other sites More sharing options...
lemmywinks Posted May 20, 2023 Share Posted May 20, 2023 I'm sure there used to be a stickied thread explaining impedance, if not one needs doing! 2 Quote Link to comment Share on other sites More sharing options...
Sparky Mark Posted May 20, 2023 Share Posted May 20, 2023 13 minutes ago, lemmywinks said: I'm sure there used to be a stickied thread explaining impedance, if not one needs doing! Amen to that. Quote Link to comment Share on other sites More sharing options...
BassmanPaul Posted May 22, 2023 Share Posted May 22, 2023 The cabinets are best if they are identical. If they are of different manufacturers do the battery test and ensure they are both working with the same polarity. Quote Link to comment Share on other sites More sharing options...
Baloney Balderdash Posted May 25, 2023 Share Posted May 25, 2023 (edited) 2 8 Ohm cabinets connected in parallel (which is usually how the speaker outputs on amps are connected) equals 4 Ohm, so you should be good. 2 8 Ohm cabinets in series though equals 16 Ohm, but it is with almost 100% certainty that the speaker outputs of your amp will be connected in parallel. Edited May 25, 2023 by Baloney Balderdash Quote Link to comment Share on other sites More sharing options...
0175westwood29 Posted May 25, 2023 Share Posted May 25, 2023 On 21/05/2023 at 00:34, lemmywinks said: I'm sure there used to be a stickied thread explaining impedance, if not one needs doing! 100% dont mean to be harsh to the OP we all have to learn but that a simple google search or its actually in modern amps in the manual. 1 Quote Link to comment Share on other sites More sharing options...
Baloney Balderdash Posted May 25, 2023 Share Posted May 25, 2023 (edited) 7 minutes ago, 0175westwood29 said: 100% dont mean to be harsh to the OP we all have to learn but that a simple google search or its actually in modern amps in the manual. Yes, how about we just close Bass Chat and in its place just leaving an image saying "Use Google!". Edited May 25, 2023 by Baloney Balderdash 2 1 Quote Link to comment Share on other sites More sharing options...
0175westwood29 Posted May 25, 2023 Share Posted May 25, 2023 1 minute ago, Baloney Balderdash said: Yes, how about we just close Bass Chat and in its place just leaving an image saying "Use Google!". thats not waht i meant but a pinned thread for impedance was more what i meant so if people are here they can look at that thread and very quickly get the answer Quote Link to comment Share on other sites More sharing options...
fretmeister Posted May 25, 2023 Share Posted May 25, 2023 There's a link to an impedance calculator in my signature. Everybody should save it. 2 Quote Link to comment Share on other sites More sharing options...
asingardenof Posted May 25, 2023 Share Posted May 25, 2023 1 hour ago, fretmeister said: There's a link to an impedance calculator in my signature. Everybody should save it. It is a great ready reckoner. Is there a possible enhancement with the minimum load rating for the amp taken into consideration? Does that make a lot of difference? Quote Link to comment Share on other sites More sharing options...
BassmanPaul Posted May 25, 2023 Share Posted May 25, 2023 (edited) Calculating parallel impedances is so simple as just about every one in the world has a calculator built into their phone. Formula is R1 times R2 divided by R1 plus R2. Using 8Ω and 4Ω: 4Ω times 8Ω=32, 8Ω plus 4Ω = 12. 32 divided by 12 = 2.67Ω. QED Edited May 25, 2023 by BassmanPaul Quote Link to comment Share on other sites More sharing options...
fretmeister Posted May 25, 2023 Share Posted May 25, 2023 6 hours ago, asingardenof said: It is a great ready reckoner. Is there a possible enhancement with the minimum load rating for the amp taken into consideration? Does that make a lot of difference? It's not my site. I just put it in my Signature because I thought it would be useful to anyone with an amp! 1 Quote Link to comment Share on other sites More sharing options...
fretmeister Posted May 25, 2023 Share Posted May 25, 2023 1 hour ago, BassmanPaul said: Calculating parallel impedances is so simple as just about every one in the world has a calculator built into their phone. Formula is R1 times R2 divided by R1 plus R2. Using 8Ω and 4Ω: 4Ω times 8Ω=32, 8Ω plus 4Ω = 12. 32 divided by 12 = 2.67Ω. QED Yeah... but that requires remembering the formula. It's actually easier just to learn the common combinations by rote. 8&8 = 4 ohms 8&4 = 2.67 ohms 4&4 = 2 ohms. There's hardly any 16 ohm bass cabs so no need to remember those. 1 Quote Link to comment Share on other sites More sharing options...
BassmanPaul Posted May 25, 2023 Share Posted May 25, 2023 Indeed that's what I do. After a while it becomes automatic! 2 Quote Link to comment Share on other sites More sharing options...
asingardenof Posted May 26, 2023 Share Posted May 26, 2023 20 hours ago, fretmeister said: Yeah... but that requires remembering the formula. It's actually easier just to learn the common combinations by rote. 8&8 = 4 ohms 8&4 = 2.67 ohms 4&4 = 2 ohms. There's hardly any 16 ohm bass cabs so no need to remember those. The Barefaced 12 ohm option on the Two10S makes things interesting Quote Link to comment Share on other sites More sharing options...
fretmeister Posted May 26, 2023 Share Posted May 26, 2023 28 minutes ago, asingardenof said: The Barefaced 12 ohm option on the Two10S makes things interesting If someone is using a pair they can have 6 ohms and they really won't hear a difference in the real world. Impedance is not a static figure anyway - it varies in use. Or if they have a 2 ohm capable amp they can run a pair of them in 4 ohm mode. Even if I had a 2 ohm capable amp I'd run a pair of them at 6 ohms. Less of a chance for an amp problem and just turn it up a tiny tiny bit more. 1 Quote Link to comment Share on other sites More sharing options...
BassmanPaul Posted May 26, 2023 Share Posted May 26, 2023 2 hours ago, fretmeister said: Even if I had a 2 ohm capable amp I'd run a pair of them at 6 ohms. Less of a chance for an amp problem and just turn it up a tiny tiny bit more. If an amplifier has been correctly designed to operate, as all the ones I own are, into a 2Ω load they will run just as well at 2Ω as they will at 8Ω. Quote Link to comment Share on other sites More sharing options...
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