The 125hz valley is purely the main speakers and listening position within the room. (the response from 63hz - 200hz is the same with or without the sub)
If I move toward the center of the room, the null shifts downward to 60hz, basically gutting the midbass and causing a large rise between 20 and 40hz.
20hz extension is no problem at all for the sub, though I often wonder how much impact it actually has on the quality of the bass response.
I can use a 120hz crossover, allowing the sub to fill in the 125hz valley, but this results in a shelved response, with the range from 20-60hz being 9db higher in level than the upper bass, and 7db higher than the reference level.
Tends to vibrate the light fixtures and windows audibly.
The 8'x5' living room window sounds like it's gonna collapse at high levels, and the character of bass instruments is not particularly realistic.
If I move toward the center of the room, the null shifts downward to 60hz, basically gutting the midbass and causing a large rise between 20 and 40hz.
20hz extension is no problem at all for the sub, though I often wonder how much impact it actually has on the quality of the bass response.
I can use a 120hz crossover, allowing the sub to fill in the 125hz valley, but this results in a shelved response, with the range from 20-60hz being 9db higher in level than the upper bass, and 7db higher than the reference level.
Tends to vibrate the light fixtures and windows audibly.
The 8'x5' living room window sounds like it's gonna collapse at high levels, and the character of bass instruments is not particularly realistic.