Studio Tube
What is the power and sound difference between using a 8ohm and 16ohm speaker in my guitar amp?
I have a Peavey Windsor studio amp. It's an all-tube at 20w. If I swap the stock speaker to a 16ohm instead of the 8 ohm it comes with, am I losing any power? Will the sound be different as say replacing it with a better 8ohm speaker?
The amp has a 4-8-16ohm switch, so it'll take it. But I just want to know how that effects power and tone. Thanks in advance.
In general, the lower the impedance the more power the amp can deliver to the speaker... this applies more to power amps than guitar amps though, since guitar amps usually have an impedance rating on their speaker outs.
If you match the impedances, the power delivered is going to be approximately the same, thus the volume will be approximately the same. I have heard it told that lower impedances will be less reactive and be a little more linear, while higher impedances will have more reactivity and nonlinearity (one component of that classic tube amp sound) but I don't necessarily think the effect is going to be distinctive. I haven't heard a significant difference between hooking my stereo cab up at 4 ohms vs 16 ohms, except *possibly* a teensy bit more volume and possibly a teensy bit more brightness.... again, if the output impedance of the amp matches the input impedance of the speaker, you should notice very little tonal or volume difference.
Well, it's more complicated than that. Speaker sensitivity has a huge impact on sound. It's like headphones... some are more quiet than others. If you find the sensitivity rating on them, it'll tell the story why. The higher the sensitivity, the vastly higher volume will result, even at the same wattage. I think its a 6 or 10 db difference that gives twice the volume, something like that (google it before you quote me), so a speaker with a sensitivity of 96 db at 1 khz will be far quieter than a speaker with 105 db at 1 khz.
Aside from that, you have the tonal differences from speaker to speaker, and that can play into the perception of volume.
Yeah, as long as impedances are matching, though, you won't have any issue from that quarter.
Saul
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