Any good for use on low bass ?

On the other hand, leftfield thinking time....

What if you ditch (ie sell to help with costs) the Maxx4 altogether?

A 15" 2way with the 15CL76 as modelled already and a decent HF could save you needing to carry 2 cabs in the first place?

RCF ND640 (hell, maybe even the new B&C DE111 - seems too good to be true but as you're not trying to thrash out insane volumes might just be enough) on an HF94 should be able to cross over quite low, and only adds 2.4kg (or 1.6 with the DE111!) to the weight of the cab, just as an example.

I would recommend biamping that, partly because it's easier then designing a passive crossover (you can make repeated adjustments incredibly easily when it's just tweaking values on a screen) and partly because the Thomann DSP 4x4 Mini already runs off a 12V supply, saving the hassle of converting up to 240V to run most other DSP's.

Re: EQing the Maxx4, we'd need a bit more info about it to be able to give any useful advice.

Do you have a datasheet for it by any chance? I've googled and can't find one.

Failing, that, do you have any test equipment, or even the opportunity to do a small practical test please?

I'd like to know what frequency the ports are tuned to, as that will dictate how low it might be possible to apply any useful boost. Even without test equipment, you can get a feel for that by literally resting your fingers against the cone and sweeping a sine wave through it at moderate volume (just enough to feel the vibration). There will be a frequency, probably somewhere between 45 & 65Hz for a speaker like this, where the vibration is minimized, with more vibration above & below. That is the port tuning frequency.

Also, have you ever tried running the Maxx4 just on one single channel of your amp?

If so, how much poorer would you say its maximum volume was compared to when you bridge 2 channels of the amp please?

Cheers,

David.