@bartsw wrote:
Many as myself have had active subwoofers and speakers with powered woofers that failed and replacement parts are no longer available! That’s the #1 issue. The speaker or subwoofer becomes a heavy $$$$ brick. If the parts are not available, I need to know I can swap in a part from a different brand and it fits and sounds the same.
Strictly speaking what's implied by poster @lonemountain is whether that of an amp being placed inside a speaker or not will see a disadvantage in reliability with the former scenario, and to his assessment it will not. I'd agree with that.
What you're addressing of the (parts) quality of the amp itself that's built into a subwoofer, and in that regard I'd definitely agree it's in issue where reliability goes. Those caps go up in smoke all too frequently, and clearly points to low quality, cheap components. The more fitting context here though is active main speakers, and in that regard amp and overall parts quality is usually somewhat better than those placed in subs.
I take it ATC speakers aren't representative both in regards to reliability and a company that's likely to be around years ahead, not mention that they can service (from what I've heard) most any ATC speaker from decades ago.
My own active speakers by a dutch manufacturer are 35 years old and fairly newly refurbished by the official repair man/technician of the brand. You just don't see that very often. But then again here you see the use of (large) class A/B amps in their own compartment with larger than beer can sized RIFA output caps that last close to a lifetime, Sanken output transistors etc.; stuff that's built to last, and not some cheap components that will fail in a few years.