Bill Fitzmaurice

Using different cabs works very well when each operates within its own frequency bandwidth. That's what PA systems do. Bass cabs don't do that. For every frequency where different cabs are augmenting each other there's another where they'll be fighting each other. With identical cabs they're always augmenting each other.

Mixing cabs seldom works anywhere near as well as using identical cabs. That's not to say that any two cabs together won't usually work better than either alone, because they will. But what you're proposing is more like having summer tires on one side of your car and winter on the other, so you're ready for any condition. The reality is that it won't work well in either summer or winter. Find a cab that you like. If one isn't loud enough get another. If what you have doesn't work for you try something else.

Garter belt. They look much better on these lassies: https://www.fredericks.com/lingerie/sexy-gartered-lingerie?offset=0&limit=56

Class A valve amps can do double duty as portable room heaters. They're that inefficient. But as to the OPs question the vast majority of the power consumption is linear with respect to output, so if you're running ten watts out of a ten watt amp or ten watts out of a 1kW amp the power meter will be spinning at pretty much the same rate.

Yes, but when you have just one brace connect the middle of two opposing panels their stiffness becomes the same as if you'd doubled their thickness. With more braces one can make a cab out of 12mm that's stiffer than one made of even 24mm plywood that's not braced.

Or building commercial cabs. Most use 18mm, because it's less expensive to build a minimally braced, or even unbraced, cab from 18mm than it is to build a well braced cab from 12mm due to the higher labor cost of bracing.

The OBC 212 by all reports sounds good, and it's small. However, the downside to the isobaric configuration is that it has the same output as one twelve in a standard ported cab. It also weighs a lot more than most 112s.

By and large the Alpha is better in a sealed cab, the Beta better in a ported cab, but it also depends on the cab particulars.

Alignments are obsolete. Back in the Dark Ages before the PC, when speakers were designed with slide rules and scientific calculators, alignments were devised, to reduce the innumerable possible permutations to just a few, for the sake of simplicity. WinISD still has them listed in the initial calculation stages as starting point, but once you've got to the results page you can change the box volume and tuning frequency at will and it will recalculate the result, with each recalculation being a new alignment. This gives you the ability to try all of those innumerable possible permutations. With slide rule or scientific calculator that was impractical, as each new calculation could take fifteen to thirty minutes to do the calc, and then another thirty minutes to manually chart the result. With a PC and modeling software it's very practical, with each new calculation and chart taking no more than fifteen to thirty seconds, unless you decide to overlay the charts for each new calculation. Then it can take maybe a minute or two for each additional.

If the port is too short it will make for a boomier tone, if too long you lose midbass sensitivity. You should use speaker modeling software to determine the correct length.

It's strange. I've only come across one driver, the Dayton RSS 390-HF-4 subwoofer, that has a rear gasket but not a front gasket. Of course the cab that I specify it in is a horn, so a gasket has to be added. 🙄

The gasket on the front is so you can rear mount them, though that's seldom done today other than in horn loaded cabs. They should have a gasket on the rear of the flange as well, 'tis puzzlement why they all don't. They can be sourced.

You may use 18mm in just about any cabinet. The reason most well designed cabs don't use it is that with adequate bracing 12mm is sufficient with less weight.

Varying the size of a sealed cab by a moderate amount has little effect on the result.

That sound is 95% technique, 5% gear. Bootsy Collins was one of the first, and is still one of the best funk players. Bootsy could play a washtub bass and it would still sound like Bootsy.

My preference is blowing out. Blowing in can result in dust accumulation on the heatsink, reducing its effectiveness over time. I've seen fans with filters to prevent dust from ending up inside, on computers, but not on amps. They're not a panacea either, you have to periodically clean the filters. Pro-sound rack mount power amps can be either in or out flowing, with the fans on either the front or back. With those I've seen occasions where an out flow from one amp can get pulled into the in flow of another amp, leading to a very uncool result.

That's a great driver, but probably overkill/overpriced for your needs.

There's more than one Delta 10. The A version, 8 ohms, has 3.5mm xmax, which is adequate. The B version, 16 ohms, has 1.8mm xmax, which is not adequate. 1.8 mm versus 3.5mm xmax means the B will only take half the voltage, one quarter the power, before heavy distortion occurs. Even the A is no prize, with a resonant frequency (Fs) of 66Hz it's best employed as a PA midbass, with separate subs handling the lows. Both the Alpha 10 and Beta 10, with Fs of 50 and 53Hz respectively, are better for electric bass.

From the little I've seen about OEM grade SICA they may not be anything great either. I'd investigate them further before going to the trouble of putting them in.

With only 1.8mm xmax they're not suitable for electric bass. That's roughly half the absolute minimum I specify for use in any of my designs. I guarantee the seller looked at inches and watts and nothing else.

The chart on the LaVoce site is with the driver mounted in a wall. That's how raw driver response is measured. It doesn't reflect response when in an enclosure, which totally changes low frequency response. It should only be used to compare the half-space response of various drivers above 200Hz.

OK, I see that on the catalog page. It's wrong. The low frequency limit is determined by the combination of the T/S specs and the cabinet alignment, so you can't assign an arbitrary number to the low frequency response. Your model is accurate.

Flux is flux, it doesn't matter if the source is neo, ceramic, alnico or field coil.

According to what?

+1. A pair of 2x10 are a lot easier to pack and haul, they can be vertically stacked for much better results than a 4x10, and you can leave one at home when you don't need both. By the looks of it the amp will fit into a standard 19 inch rack case.