An SPL meter doesn't sound like a bad thing to have in the house.
REW is better.
The anechoic -6dB point is useful to know when considering what LF the speaker will offer in your room when the effect of room gain is added. Sometimes, companies will offer low end response in a "typical" room but without stating the room dimensions. See: https://www.svsound.com/blogs/subwoofer-setup-and-tuning/what-is-subwoofer-room-gain? |