What ohms setting to use?

[mldavis]

Hi guys

I've just bought the new Rumble 410 cab by Fender - link below, and I'm going to be using my Orange Bass Terror 500 with it. The cab can be set to 4 or 8 ohms, which setting would you suggest I use?

Invalid Link Removed

thanks
Martin

 

[CL400Peavey]

The cab's impedance will be set. You should match the amp to that.

 

[P-oddz]

Do you mean the head can be set to 4 or 8 ohms?
The cab specifies an 8 ohm impedance. That would mean with that single 410 Rumble cab you'd switch your Orange head to 8 ohm.

 

[Bulldawg82]

A 4x10 cabinet will only have an efficiency/mechanical capacity of about 300-350 watts (even though they can handle more wattage, it will not use it efficiently if you push it past a certain point - which is the mechanical/efficiency capacity of the combined speaker configuration). If your amp can push 500 watts at 4 ohms, then it will push about 300 at 8 ohms. The 8 ohms will better utilize the cabs efficiency level without degrading the sound quality (which will happen if you try to push a full 500 thru it).

 

[CL400Peavey]

A 4x10 cabinet will only have an efficiency/mechanical capacity of about 300-350 watts (even though they can handle more wattage, it will not use it efficiently if you push it past a certain point - which is the mechanical/efficiency capacity of the combined speaker configuration). If your amp can push 500 watts at 4 ohms, then it will push about 300 at 8 ohms. The 8 ohms will better utilize the cabs efficiency level without degrading the sound quality (which will happen if you try to push a full 500 thru it).

Wrong. The TB500 supplies 500 watts at both 8 and 4 Ohms.

 

[Bulldawg82]

Wrong. The TB500 supplies 500 watts at both 8 and 4 Ohms.

Ah! I didn't know that! Thanx for the info. Usually a 500 at 4 ohms is a 300 @ 8. Does any other amp does this besides Orange?

 

[CL400Peavey]

Ah! I didn't know that! Thanx for the info. Usually a 500 at 4 ohms is a 300 @ 8. Does any other amp does this besides Orange?

The TB1000 does as well. They are the only two that I know of though.

 

[Bulldawg82]

The TB1000 does as well. They are the only two that I know of though.

Thanx!

 

[DiabolusInMusic]

The TB1000 does as well. They are the only two that I know of though.

I thought all tube amps put out the same wattage no matter what the tap is set at, MY SVT-CL and my Ashdown Little Bastard 30 both put out the same wattage regardless of the ohm tap. Or am I wrong and just thought they did?

 

[BassmanPaul]

I don't think you'll find that the Terror is a full tube amp. The Carvin BX500 has a 4/2Ω switch too.

 

[CL400Peavey]

I thought all tube amps put out the same wattage no matter what the tap is set at, MY SVT-CL and my Ashdown Little Bastard 30 both put out the same wattage regardless of the ohm tap. Or am I wrong and just thought they did?

Yes, I was referring to SS amps.

I don't think you'll find that the Terror is a full tube amp. The Carvin BX500 has a 4/8Ω switch too.

+1
Some amps have switches for output impedance, regardless of the topology of the amp.

 

[mldavis]

Thanks for the replies.

So all I need to do is ensure the amp is set at 8 ohms and I'll be good to go?

It's my first amp/cab so just want to make sure I don't blow it up or something!