stevie

I'll be resuming this thread in a couple of weeks, Peter - with plenty of piccies.

I haven't given up on the flatpack idea entirely, Jack and I still have one or two avenues to explore. But let's get the final design up first. I also need to contact Marco (Ghost_Bass) to see if he can finalise the drawings. I haven't seen him around for a while.

The problem isn't with the Celestion driver itself; it's just that it's been crammed into too small a box. I had the 15" version of this cab and I'm pretty sure the internal volume was 50 litres. So you need to find an 8" driver that will perform well in a volume of around 12 litres.

I know there hasn't been much activity on this thread recently, although there have been a few references to it in other threads. As previously explained, the next stage here is a lightweight design using neo drivers. As an interim step, I've just revised Chienmort's Beyma system by swapping out his Celestion ceramic compression driver for a neo one. The sound hasn't really changed, but we've saved about 1.5kg thanks to the new compression driver and simplified crossover. Phil asked me how it measures, and the easiest way of showing him is to post the measurement here. So..... I've been able to compare this cab with my own version fitted with the Faital Pro 12PR320 (and the same compression driver) and the Faital Pro cab is noticeably better in a number of areas. I'm therefore not going to publish any details of this interim system, but will go straight to the Faital Pro system once I have revisited the crossover to see if I can't make it a bit simpler. As you can see from the frequency response curve, this design is as FRFR as you like.

The LaVoce bass guitar driver looks quite good. I find it more useful nowadays to judge excursion based on the coil length rather than xmax because of the complication of gap height. The LaVoce measures 18.5mm, which is pretty good and fairly close to the drivers used in more expensive bass guitar cabs. The Beyma you mentioned measures 20mm, which is slightly more than most.

Don just bought a compressor from me. He was very easy to deal with and I'd happily sell to (or buy from) him again. Thanks!

I think the OP was hoping that someone with a Glockenklang cab who has added a second could advise. You should really audition any cabinet you are thinking of buying. All I would say is use the Glockenklang on top and don't buy a second cab with a tweeter, because you'll get cancellation. And don't change your amp yet. A second cab will give you a useful volume boost and you're better off making just one change at a time (in search of your "tone"). 🤩

This is true. You also don't want massive monitors if you're playing pubs. I use the Wharfedale Titan 8s. They're dinky and plenty loud enough.

Good point.

Craaft are a well-estabished company based in Bavaria.I don't think they're involved in bass guitar cabs any more, but they manufacture quite a wide range of PA cabs. Last time I looked, they were the only German company making their own sound reinforcement drivers, and these were high quality. I think there's every chance this is a seriously good 4 x 10" cabinet, although whether it's worth the asking price is a matter for the buyer to decide.

Nobody complains louder about cab manufacturers' specs that me, but by and large their published power ratings seem to be on the level. They're provided with the power handling figures by the driver manufacturers and any attempt to fudge them would be tantamount to lying to their customers. As far as I can tell, there are very few commercial cab makers who feel they have to resort to that. Frequency response and sensitivity - now that's a different matter.😀

It would be good if bass amp makers fitted a high pass filter as a matter of course. It would only cost them pennies. I know some do, but none of them provides that information as far as I know.

It looks like a budget version of the SM212. There's no info on the Beyma website, but might well be a direct swap for the SM212, which has gone up in price by about 20 percent in the past few years.

If you send it to me, I should be able to fix it for you. Let me have a photo first.

Agreed. None of the crossover parts are likely to be " out-of-date, super-specific high end". Caps and resistors will be marked with their values and any electronics person with half a brain should be able to order replacements from a specialist supplier. You're unlikely to need a complete crossover. The coils might not be marked and will have to be disconnected and measured (if that's where the problem is). If the caps are blown, the markings might have disappeared. In which case, you simply open up your second cab and have a look. KEF have a reputation for good service support and will probably send you a diagram of the crossover if you ask them. If you don't mind my saying so, your repair guy is either incompetent or lazy.

Colin bought my broken Behringer equalizer - fingers crossed he manages to fix it. Lovely chap and a pleasure to do business with. Stevie