BassmanPaul

Quite probably but in my case I would have to try one to be convinced. I use a vertical stack of a pair of Acme B2 2x10s. I'm also very conservative with my amplification systems. Living in the Toronto area I've yet to have the pleasure of auditioning any of Alex's products though I have known him through Talk Bass for many years. IIRC at one time he was an Acme abuser too.

Too little speaker area for the job at hand. I wouldn't try to gig with a 2x10 let alone a single ten. Give Alex a call for suggestions.

Last thing I needed was a foul mouth twerp with a bass!

Hooray ! There's nothing like a good move now and again!!

LOL That was my background too. Commissioning Telephone Exchange installations. First for Automatic Telephones in Liverpool and then STC in sites in South Wales. I absolutely loved that job. There was seemingly no equivalence over here. Bell offered me a job shimmying up telephone poles. With my head for heights I said NO!

Shoot! I didn't even notice that until you drew our attention to it!

OP Just for laughs and giggles try linking the Send and Return of the Effects Loops with signal cables to see if your problem lies there.

In a tube amp you would be correct not so much for SS. Mind you you can get a good burn off them. BTW it's voltage that caps hold. and some tube amps use upto 800V.

Unlikely to be either the big bad 'capacitors' or the power transformer. Your amp needs to be diagnosed properly, which won't happen across the internet, to discover what is wrong. What tools do you have like a scope and Digital multimeter and what skills do you have working with electronics? Do you have the units schematic and if so can your read it?

Typically it's the normalizing contacts on the loop jacks that cause the problems. These are very difficult to reach from outside the amp. Spraying contact cleaner into the jack causes more problems than it solves.

Class D amplifiers are analogue too. Difference in size could be the difference in Class AB and Class D output sections.

If the amp has an effects Loop or a Pre-amp Out Power Amp In loop link Send and Return with a signal cable to exclude the loop from consideration. Similarly link Pre-amp out to Power amp in jacks for the same reason.

I just got an explanation from Alex myself so now I know what's behind this. It should also be noted that this is the exception rather than the rule.

If you don't keep in mind what I posted the cabs won't work well with each other. If both are 8Ω the 2x10 will limit the abilities of the 4x10. You could well get less that the 4x10😘 by itself.

With two drivers to get 4Ω, each driver has to be 8Ω run in Parallel. Switching them to Series results in 16Ω not 12Ω.

The only way that a 2x10 will mate well with a 4x10 is if the 2x10 has twice the impedance of the 4x10. That way when operated in parallel each driver in either cabinet will see the same power level. You do have to make sure that the combined impedance does not go lower than the amplifiers minimum operating impedance.

The boy stood on the burning deck eating a threepenny Walls A piece of ice fell down his neck and paralyzed his kneecaps.

Mary had a little lamb It had a sooty foot And everywhere that Mary went His sooty foot he put.

Traitor!

Until the 15s started to fail. I honestly think that the pairing came about because Marketing wanted to show as many products as they could in one advert. A 4x10 can go lower and louder than a single 15 and some 15s can go higher than the 4x10.

Why do you think the pairing fell out of favour?

Not really. A 1x15 has no hope of keeping up with a 4x10. Eventually the 15 will be damaged.

I can connect all four of my 4Ω Acme B2 cabinets to my Class D power amp and get all 2KW that the amp is capable of. The lil' tube pre-amp I designed to drive it is icing on the cake!

It's for reproducing highs and only highs. It's not a full range speaker suitable for home practice.

With the accuracy of clip on tuners such as the Snark I see no point in adding one to an amp. I find such threads as this a tad bizarre. There are not many guitar players who would plug right into a PA and go for it. All I have met want their favourite amplifier on stage with them. Output impedance at 0.5Ω won't happen. It takes too much design investment to do so. To get the same power levels into the other impedances would require a bulky transformer to match the amp into the various loads. Look how many in today's market work into 4Ω at the lowest. It;'s all well and good each of us making a feature list of what we want from out amplifiers. Manufacturers need to sell a decent number of identical units to make a profit. Your wish list would be very different than mine. No-one can produce 'Swiss Army knife' amp that will suit every player out there. Keep safe and healthy.