#1
https://www.thomann.de/pt/randall_rg_1503_head.htm
https://www.thomann.de/pt/laney_irt212_ironheart.htm

1 4ohm head into 8ohm Will it work without damaging anything?

2 Does the cab have stereo?

3 You need a speaker cable to connect head/cab or will a normal guitar cable suffice?

P.S Can't get harley cab because it's too heavy to ship (laney is free but harley is 164euro for shipping.)

Any other cab suggestions under 20kg and near price are welcome
Last edited by DavidHox at Dec 7, 2016,
#2
SS amps can generally take output impedance mismatches UP (amp is rated less at the output than the speaker, so 4 ohm amp into 8 ohm total load). They cannot take mismatches down (4 ohm amp into 2 ohm total load). Tube amps do not like either. Your cab does not have to work in stereo, just make sure in mono operation both speakers will work and it will be at a proper total impedance rating for you amp, and that one of your amp's single outputs will send the full signal.

However at a mismatch UP, you will loose some output volume as you typically halve wattage every time you double impedance. So if the amp outputs 150w at 4 ohms, it will output ~75w at 8 ohms. Use ONLY a speaker cable for head/cabinet connections. When in doubt, read the manual.
Last edited by Will Lane at Dec 7, 2016,
#3
Exactly. With SS amps you can go as high impedance as you please, the amp just runs out of juice as you do so. With 16ohm cab you turn the 150w beast into a 35w practice amp.

But if you go below the minmum load the amp tries to push more power than it is capable of, where the amp either shuts down if there is any overload protection, or it goes boom.

ESP LTD F-50 + Tonezone
Cort EVL-Z4 + X2N
Cort EVL-K47B

Marshall Valvestate 8100
Randall RG1503
Bugera 333
Peavey Rockmaster preamp

Line6 Pod X3
Last edited by MaaZeus at Dec 7, 2016,
#4
Quote by DavidHox
https://www.thomann.de/pt/randall_rg_1503_head.htm
https://www.thomann.de/pt/laney_irt212_ironheart.htm

1 4ohm head into 8ohm Will it work without damaging anything?

2 Does the cab have stereo?

3 You need a speaker cable to connect head/cab or will a normal guitar cable suffice?




1. That's an 8 ohm cabinet, which will be fine with the Randall head. The head requires a minimum of 4 ohms impedance, which means you could link a pair of these cabinets together. When the specs for the head state that you will get 150W@4ohms, you should know that with most solid state heads, that also means that you will usually get a bit more than half that power to an 8 ohm load.

2. The cabinet will not support stereo as is. The second 1/4" jack is to support a second 8 ohm cabinet.

3. You need a speaker cable to connect the head to the cabinet. A guitar cable has a very skinny wire insulated from a shield, and that wire gauge is insufficient to handle the output power of an amp. Two things will happen. The skinny wire will rob power from the amp, and it can overheat and melt the cable, shorting it and damaging your amp. You can even build your own speaker cable from a pair of 1/4" ends and a piece of zip wire (normal extension cord), the thicker the better. No shielding is necessary; just two wires side by side.