Again, the key is to try before you buy. There are tremendously varying opinions in the harp world about this question. Again, the best option may be to try before you buy. The classic speaker in the harp world is the 10-inch speaker, usually used in combinations of two or four. Smaller speakers offer more overdrive, less bass and less sound dispersion.
Larger speakers offer just the opposite traits.
Many musicians prefer pairs or quads of speakers because such combinations create a more complex sound, in their ears, and also do a better job of spreading the sound around. This FAQ won't deal with off-board effects, such as effects pedals or racks. Reverb is the echo-like sound usually created in a guitar amp by sending the signal through a series of springs, creating a second, softer, muffled, delayed signal. Virtually all modern combo amplifiers contain reverb . However, many older Fender and Gibson amps from the 1950s and early 1960s did not.