Laney IRT 60 speaker config. Question

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Laney IRT 60 speaker config. Question

Postby Silas2342 » Wed Jul 10, 2019 3:45 pm

I recently purchased the IRT 60. Love it!! I am a bit confused with the speaker connection layout. The manuel did not really elaborate. I know with tube amps it is very important the ohlms match. I am looking to use 2 4ohlm speakers cabs. (4×12 rated at 4 olhms. It does show 2 separate 4 ohlm inputs. It also shows at the input that it boxes the one together next to it on the speaker congig. Which 2 should I use.
And one more question. Is it ok to plug one 4 ohlm in and also an 8 ohlm at the same time? I also have a 2x12 8 ohlm Id like to use with a 4x12 4olhm at same time. Thank you

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Re: Laney IRT 60 speaker config. Question

Postby Polsky » Tue Jul 30, 2019 1:17 am

Unfortunately you can connect only one 4 ohm cab. But this apply to almost all amplifiers. So speaker outputs are connected parallel, which mean you have divide sums of ohms your both cabs by two. If you gonna use 2 cabs 16 ohms each one you got 8 ohms, if you gonna use two 8 ohms cabs you have 4 ohms. If you gonna use two 4 ohms cabs you need 2 ohms input which is anavailable with today transformers. Some old Marshalls and Ampegs had output transformers with 2,4 ohms load, but todays amps are 4 8 or 16 ohms.
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