Is there a decent attenuator that works with more than one impedance

riffpowers

the thd hotplate seems to be the attenuator of choice , but you'd need to match the impedance to your amp and speakers .
for someone like me that does a lot of gigs where you just bring an amp head , that would mean I'd either have to buy 2 or hope they have a 16 ohm cab at the venue 

is there a decent attenuator that works with more than 1 impedance ???

Bod

I believe the Jettenuator does that...

Moe_Zambeek

Fryette power station. Spendy though.

riffpowers

This would be for a 1959slp.

zepp76

I am thinking of getting the Rivera Rock Crusher it does 8 or 16 ohm and gets very good reviews, check one out I think it'll do the job nicely.

Teetonetal

Tow notes Torpedo, 4, 8 and 16 ohm speaker options

cosmiccarrot

Marshall power brake, 4 (not 4 oops), 8 and 16ohm, great with marshall style amps. Some attenuators work better with different amps so it's worth bearing that in mind.

andy1839

zepp76 said:

I am thinking of getting the Rivera Rock Crusher it does 8 or 16 ohm and gets very good reviews, check one out I think it'll do the job nicely.

I've had the standard Rock Crusher for a couple of years now, works with everything, and as it's a reactive load it's better than a resistive one.  Big unit though.  

ICBM

It's not as much of an issue as you think - you need to match the attenuator to the amp, not the cab - the amp sees the attenuator as the load, not the cab, as long as the attenuator isn't bypassed or set to (usually) the first click down. Anything more than that and the attenuator is taking at least 3/4 of the power of the amp, and the cab impedance quickly becomes irrelevant.

So a 16-ohm amp into a 16-ohm attenuator into any speaker cab is OK, as long as the attenuator is set to at least -6dB - which it almost certainly will be with a SLP!

The Hotplate is not the attenuator of choice for a SLP - it's not great for Marshall-type and Vox-type amps in general, although it's very good for Fender and Mesa. It will stress the valves quite heavily with a SLP if you're cranking it.

The Marshall Powerbrake only has 16 and 8 ohms, not 4, but it's a much better choice for this amp.

fretmeister

My Weber has switchable impedance 

Not tried it with a Marshall though.

riffpowers

ICBM said:

It's not as much of an issue as you think - you need to match the attenuator to the amp, not the cab - the amp sees the attenuator as the load, not the cab, as long as the attenuator isn't bypassed or set to (usually) the first click down. Anything more than that and the attenuator is taking at least 3/4 of the power of the amp, and the cab impedance quickly becomes irrelevant.

So a 16-ohm amp into a 16-ohm attenuator into any speaker cab is OK, as long as the attenuator is set to at least -6dB - which it almost certainly will be with a SLP!

The Hotplate is not the attenuator of choice for a SLP - it's not great for Marshall-type and Vox-type amps in general, although it's very good for Fender and Mesa. It will stress the valves quite heavily with a SLP if you're cranking it.

The Marshall Powerbrake only has 16 and 8 ohms, not 4, but it's a much better choice for this amp.

Thanks for the advice, I had a powerbrake with a 1987x a few years ago and it worked well, its good to know whats the right kit.

ICBM

It's a real shame Marshall discontinued it, although they're not too rare second hand. It was quite a unique design and worked particularly well with amps that prefer a steeper impedance curve than a flatter one… like Marshalls.