Bill Fitzmaurice

I'm familiar with battens, I've used them extensively in home building, just not in speakers within recent memory. I went to monocoque in the 1990s.

I haven't used corner battens for 30 years. They're not required for assembly, and the corner joints are the strongest point of the cab, so they don't add any bracing. The material used for them is much better employed as cross bracing.

Batten?

Like this? Airhead optional.

Of course, but they'd have to be longer to maintain the tuning. WinISD will tell you how long.

Span is the key. My benchmark is to not have more than an 8 inch/20cm un-braced span.

12mm plywood is all you need, if it's properly braced. Thinner than 12mm can be done, with curved panels, which increases their resistance to vibration. Knowing how to brace cabs requires a fair amount of building experience. Sandwich constructions can work, but require even more experience to be successful. My personal cabs are primarily made of 3mm and 6mm plywood, but I had 30 years of cabinet building experience when I designed them.

The fundamental of the E is 41 Hz, but we don't hear just fundamentals, we also hear harmonics. They actually are most of what we hear, so electric bass cabs generally start rolling off their response around 60Hz. One reason why bass can be overpowering through large PA systems is the subs go a lot lower than bass cabs, so it takes a well trained hand in the FOH to get it right. Good engineers know enough to high pass the bass channel at 60Hz or higher. The best engineers tend to be bass players themselves.

I bet Alex did some market research and found that players tend to regard tall narrow cabinets as odd, so he stayed more conventional. If you're as old as me you remember when PA columns ruled. They were driven from the market by trapezoid cabs made for side by side placement with an outward splay. Where dispersion was concerned columns were better, but buyers didn't know that and insisted on the trap cabs. Marketing and sales departments decided it was better to give the customers what they wanted than to waste their breath trying to educate them. I see that the Ashdown 310 is gone from their line, probably a victim of this very issue.

I load the 2510 into a 42 liter (net) box tuned to 50Hz. 22cm port of 100 sq cm area.

Anyone still doing that 30 years ago was not adhering to established protocols. Not that the electric instrument industry has ever given that much mind. 🤥

That was many decades ago. It was so long ago that XLR had not yet become the standard for microphones and interconnects. Once that happened they stopped using them on amps and speakers, lest people plug connect low level and high level devices in error. That concern didn't stop us from using 1/4" connectors for both signal and speakers on our amps, but until Speakon came along there wasn't much choice.

You'd best make sure of that hookup. Speakons are used for high level, XLR are used for line and low level. If you're connecting a high level output from a speaker to the line level input of a powered sub the result would be magic smoke. If you're sending the low frequency output of a sub amp to tops they wouldn't care for that either. Making your own isn't much more difficult than changing a set of strings using all Neutrik solder-less connectors.

Where neos are concerned there are a few others who use Eminence OEM neo drivers based on the Kappalite motor, but most use the Deltalite II. I'm not aware of any other OEM ten that's the equal of the 10CR. For that matter Eminence doesn't sell a retail ten that equals it. 'With the same drivers'. Tens with 250cc of displacement are rare, and most that do exist are made for PA, so they're not so good in the mids. FWIW the benchmark SVT ten has 165cc displacement.

Do you have a question?

One Barefaced 210 is at least the equivalent of a pair of inexpensive 210s. How much is only having to carry one cab instead of two worth to you?

Put it in whichever position sounds better. If you can't tell the difference set it at 8 ohms, for minimum current draw from the amp.

Unfortunately most small venue systems share the same basic design flaw, they place the mains above the subs. That prevents you from placing them properly, which is with the subs clustered and wall loaded. That costs low frequency sensitivity and results in low frequency power alley. Not that point source mains placed above subs are any better in that regard. 😒

1/4 wavelength. At 50Hz, the lowest we need to be concerned with, that's 1.7 meters. At 100Hz that's 0.85 meters. Lifting by half a meter or less would have negligible effect. Something like this, with adjustable height, is versatile: https://www.amazon.com/Gator-Frameworks-Guitar-Combo-GFW-GTR-AMP/dp/B00HWRDSVM/ref=asc_df_B00HWRDSVM/?tag=&linkCode=df0&hvadid=312176484647&hvpos=&hvnetw=g&hvrand=18219144107276526533&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9002322&hvtargid=pla-437152798758&ref=&adgrpid=62521174299&th=1 There are devices to keep an amp head from sliding off as well.

You can get that with 210s stacked vertically, giving the height of an 810, but you can also get it by lifting and tilting back a 210. There are a number of stands made for that purpose, at considerably less cost and pack space than a second 210.

One BF 210 will match or even beat many 410s, dual 210s or 212s in maximum output. It's all about displacement. https://barefacedaudio.com/pages/how-speakers-move-air-volume-displacement Displacement is a critical spec that every bass cab should list. AFAIK BF is the only one that does.

You need a bluetooth transmitter, or a pre-amp that has one built in. Google them.

Technically speaking the difference between 236 and 450 watts is less than 3dB, which is audible, but just, so TC thought they'd get away with their subterfuge. TC engages in this specmanship for no other reason than greed, wanting to maximize sales through false advertising. They didn't anticipate anyone actually testing their amps. Not at all surprisingly many actually came to their defense, in effect saying they didn't care if they were lied to so long as the amps sounded good. The idea that people don't care if they're lied to so long as they hear what they want to hear is hardly confined to audio. 😒

And you've got TC Watts, where their lame explanation for the blatant exaggeration was 'Well, no, it's not actually 450 watts, but it sounds like 450 watts'. 😒

Someone who really really knows what he's doing isn't fooled by the smoke and mirrors. You actually can cheat an honest man, but it's very difficult to cheat a man who's well informed.