Bill Fitzmaurice

Tube versus SS watts has been covered here ad nauseam to the extreme. I'm sure you're just trying to be helpful but what you're saying has been covered here in detail going back over dozens of threads for as long as this forum has existed.

The same reason why far too many define the performance of an amp by watts. 😉

There are many versions of this available as PA cabs. There are none marketed as bass cabs but without a doubt some players are using them. I don't see it being a bass player thing, as we generally prefer the least complicated arrangement. Besides, one need not have a small box at ear height to hear mids and highs. Tilting a standard cab accomplishes the same thing.

Which proves the point. A common assumption is that midrange drivers are paired with woofers to extend the high frequency response. That's true to some extent, but the main reason for using midrange drivers is they deliver wider dispersion than woofers. That's because they're smaller. Tweeters are smaller than midranges for the same reason. Time was when you had to use a fifteen to get enough cone displacement for the lows along with a midrange for dispersion in the mids. That hasn't been the case since the turn of the century.

Current state of the art in driver design was realized closer to 20 years ago. What's changed since then is more and more sources are producing state of the art drivers.

Of course not. But a fifteen cannot realize the dispersion of a ten, or a twelve, which is their primary advantage, while still being able to deliver enough output to fill the stage, leaving the heavy lifting out front to the PA.

Old yank proverb: If it ain't broken don't fix it!

I've never owned more than one bass at a time. For that matter I've only owned a total of four since 1965, 25 years with my current bass.

That One 10 defines physics. Moving air isn't just an expression, it's how speakers work. A high quality modern ten with 8mm excursion capacity will move as much air as vintage fifteen with 3mm excursion.

Don't assume that if you can't see them that the amps and speakers aren't there. They may be back stage or under it, in isolation booths.

No, Watt. James Watt. ☺️

One watt is the rate at which electrical work is performed when a current of one ampere (A) flows across an electrical potential difference of one volt (V). Period.

Watts aren't meaningless, but almost. Otherwise how do you explain the Ampeg B-15? 🤥

What we used to call gear groupies. ☺️

The return jack is a mono 1/4 inch. It won't work with a stereo input.

Could be, but plugged in? the last time I saw ZZ Top they had two dozen or so Magnatones on the stage. I asked their road manager how many they were actually using. He told me Billy and Dusty were using two apiece, the rest were 'eye candy for the kiddies'. 😄

Here's the deal on Sovtek and Chinese tubes: In the West military devices, like radar and communications, converted to SS early on, being much lighter than those powered by tubes. The USSR didn't have the SS tech that the West did, so they stayed with tubes much longer. Tubes also had the advantage of being immune to electromagnetic pulse, which fries SS devices. That was a concern during the Cold War. Without the demand for tubes for the military and civilian devices other than musical instrument amps, and because making tubes is environmentally a problem, Western tube sources disappeared. Since Soviet gear still used them, and they didn't care about environmental issues, tube suppliers in the Soviet bloc remained. Musical instrument amps remain as the #1 users of tubes, most of which still come from Russia, China and Slovakia. Those that are still made in the West are much more expensive, as their manufacturers have to adhere to environmental regulations that pretty much don't exist in Russia et al.

And for that there's this:

Those are tube conversion sockets, allowing the use of a tube other than the original. https://www.tubedepot.com/t/other-stuff/yellow-jackets?srsltid=AfmBOorm7EPnxQenwo22TciGXI6p0wev-H5TymKMmUU23zzT-vgP2Z51 I vaguely recall a SS tube replacement existed back in the day, but if it had been successful it would still exist. There was a big scramble for a SS tube replacement when most tube sources went out of business in the 70s-80s. Nothing much ever came of it.

Dispersion, dispersion, dispersion. It's inversely proportional to the size of the source. The main reason for larger drivers is they can move more air than smaller drivers. If you use multiple smaller drivers you can move just as much air with higher efficiency and wider dispersion so long as they're vertically aligned. Fifteens work best where dispersion isn't a concern, which means either in sub or in 2 way or 3 way cabs where the fifteen is only run to 800Hz or so.

Do a search. This topic has been thoroughly discussed in multiple threads. It's unfortunate that your guitarist didn't do his homework before buying the DXR15s. You'd get a much better result with a pair of DXR10 and an 18 inch sub.

Playing arenas with no PA? 😄

Avoid that. It makes it harder to hear them, for you and the audience. Vertical sources always work better.

Feet don't affect the sound but they do make the cab more durable. I can't fathom any reason to not have them. However, the Markbass cab corners do extend past the panel, so they do act as feet of a sort. They also interlock when cabs are stacked, so that's the reasoning behind them. For added protection I'd add feet to the cab that's going to be on the bottom of the stack.

No. That's the myth of underpowering, which like Nessie and Robin Hood just won't go away.