If building a system from scratch, does it still make sense to select and use fullrange amps for the individual spectrum ranges. On one hand, fullrange amps would continue to be useful on its own if the system is ever dismantled. On the other hand, fullrange amps can add unnecessary costs if only a limited spectrum is required. For example, I found a SE tube design that can be built for a couple of hundred bucks but response is only 100Hz to 12KHz. However, to build it fullrange, it would double or triple its cost. Another way to look at it is for a given budget, I can either build a mediocre fullrange amp, or an excellent limited range amp.

Second question is, what types of amps are best suited for each part of the frequency spectrum in a 3-way configuration. Obviously, matching driver efficiency and sensitivity is very important, but let's assume driver choice will fall into place. I'm a big tube fan but have to admit that a used pro-amp would probably provide the best performance/cost ratio for the lower bass region of 100Hz and below. Most seem to agree that SET is the best choice for midrange, but I haven't come across any "amp-of-choice" for HF and UHF.

thanks,
Gar.