BassmanPaul

This is something that you have to be extremely careful with. Most Class D bass amps are not ground referenced. They are permanently in bridge. This means that while one power amp channel drives the speaker positive rail the other drives the negative rail. If you then plug in a unit that IS ground referenced it will short the negative channel to ground destroying the amplifier.

Some years ago I actually wrote an article published in an electronics magazine on an adaption I made to something like that. It required taking the pump off and replacing it with a plastic tube connected to my shop vac. It worked very well . I drilled a hole in the tube where the button was to allow the air to escape without cooling the tip. Blocking the hole with a finger allowed the PC board solder to be removed.

I have been using a soldering iron since age 13 or so. LOL I'm 74 ATM but only getting older! it's all too easy lifting a trace and ruining the PCB so thus my warning. Many of us have an old obsolete circuit card, say from a PC or the such. Actually trying your hand on the real thing gets you the feel.

What cleaner did you use? You only should use Deoxit D5 and then only the tiniest amount. Way too many pots have been ruined by the application of 'cleaner.'

Be careful when working on a PCB. If your iron is too hot you can cause a trace to lift off the board. I suggest using an old PCB to practice on so you can get the 'touch'.

Mary ate jam, Mary ate jelly Mary went home with a pair in her ohho. Don't get excited Don't get misled, Mary went home with a pain in her head!

If they marketed this unit in the Americas they'd have to call it the Gas Stove!

In my mind they are not such a good thing. You have to drive the snot out of your amp and then throw that power away as heat. I feel you are going to be shortening the life of your amplifier.

Why not email Markbass and ask them?

There has been a quantum shift in loudspeaker technology over the last few years. Drivers are much more able than they have ever been. You still have to have reasonable expectations on performance. A single ten inch cone can only move a certain amount of air no matter how good the driver is. Alex's products are as good as current technology allows. I'd love to play through one.

Until it didn't. Talk to Alex, I'm sure he'll help you resolve this.

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.