Bill Fitzmaurice

Assuming that 5 watts is into 4 ohms, which it probably is, that's 4.4 volts at 1.1 amperes. An 18v power supply at 500ma is 9 watts, so you're probably OK where the AC supply is concerned. The battery charger amp hour rating is moot, all that says is how long it takes to fully charge the battery. By the same token what the amp hour rating of a battery tells you is how much power it can provide for how long.

4 ohms requires less voltage swing for the same result as 8 ohms.

If the amp output jack says 4 ohms, yes. Using it occasionally for bedroom practice with an 8 ohm cab wouldn't bother it, but I wouldn't gig it with an 8 ohm cab.

With valves the cab impedance should be equal to or lower than the tap rated load. With SS the cab impedance should be equal to or greater than the head rated minimum load.

Where workmanship is concerned if anything the Vietnamese would be better. The drivers are the same, all that would differ there is coming out of the Eminence factory in Kentucky or the one in Dongguan. The wood one can't say for sure. I doubt that they'd import Italian Poplar to Vietnam, it's probably a local species. There are major plywood mills in Vietnam, so one of them would be the likely source.

On this side of the pond there's a saying 'it's the economy, stupid'. Americans don't vote for ideology, they vote for their bank accounts.

Probably not. The Average American Idiot would tolerate him so long as their pocketbook wasn't affected. But a side effect of C-19 that bothers them even more than the deaths is the unemployment. As that has mostly impacted the uneducated working class that usually votes conservative his core base of supporters has shrunk considerably.

For the most part, maybe. 'Made in USA' these days is mainly a euphemism for 'Assembled in USA from parts that came from Asia'. As an example of how weird things have become, one of the main sources of winter clothing, especially that made for winter sports like skiing and snowboarding, is Vietnam.

This is likely C-19 related. Sales of everything entertainment related are down, because nobody's working very much if at all. so I'd expect manufacturers to find ways to cut retail prices to increase sales. Don't be surprised to see many more manufacturers selling direct on the internet.

That's only an option if the cabinet has enough volume to work with three drivers, which may only be confirmed by software modeling of the speaker response with the available box volume net of the ports and drivers, and the driver Theile/Small specs. One must also use modeling to determine the area and length of the ports based on the most effective box frequency tuning and keeping the port air velocity within acceptable limits.

I'm getting a deja vu vibe. 😉

That's true of a sine wave, but even a single note isn't a sine wave. It consists of the fundamental plus all of the harmonics of the fundamental, so it too is a complex wave form. Where bass instruments are concerned in the lower registers the second and third harmonics tend to be louder than the fundamental. https://www.puremix.net/blog/musical-instruments.html

The same way that a microphone diaphragm does, which is a speaker in reverse. For that matter the same way that your eardrums do, as they are microphones.

The electrical signal to the voice coil has changed.

The speaker doesn't translate a change in the treble control. It merely passes on the information supplied to it by the amp. When the treble control is turned up the pre-amp increases the high frequency content relative to the rest of the audio spectrum. Speakers do influence tone to the extent that the audio signal they reproduce isn't exactly the same as the electrical signal they receive from the amp. This is called 'coloration'. The ideal hi-fi speaker has no coloration, while guitar speakers intentionally have very high coloration. Bass speakers lie in between those two extremes.

My comments are purely observational. I haven't owned a valve amp since the early 80s.

If you doubt that valves will be with us for long consider what's happened with vinyl.

That conversation began in the 1980s, when valves were eliminated from virtually all consumer devices other than amps. It deepened in the 1990s, when the Soviets and Chinese began to shift away from valves in their military hardware. They'll continue to be made as long as people buy them, even though they're at prices now that are on average five times what they were in the 1970s, and that's after accounting for inflation.

I recall a similar conversation regarding the death of valves, soon to be totally supplanted by SS. That conversation took place in 1966.

Possibly, but there's very little bass content above 10kHz even with single coils, and what's above 15kHz you probably can't hear anyway unless you're a teenager. Most start around 3.5-4kHz. I run mine down to at least 2.5kHz, because ten and twelve inch woofers don't have useful off-axis response above that.

My first thought would be a wireless receiver.

Try here: https://www.fliptops.net/

I don't see the need with bass. It's sort of useful with guitar to overdrive the amp, but only moderately so, as much of overdriven tone comes from overdriving the speakers.

It does appear that there may be creasing of the cones, but I can't be sure from the picture. That in and of itself wouldn't necessarily render the drivers unusable. However, if the cones are creased it would usually indicate that the voice coils have bottomed out, which would eventually, if not immediately, result in driver failure.

Those are Eminence Deltalite 2510, first generation. They were superseded by the Deltalite II 2510 some 15 years ago. The first gens had heat problems, which was fixed on the second generation with a better magnet heatsink.