Originally Posted by Dennis Erskine
As well, running your L/R speakers full range in a small room can certainly create some ugly LF problems.
It all depends on your definition of a "small" room!
I have no real problems in the subwoofer frequency area running large mains plus a subwoofer. My particular receiver evidently has an uncommon BM configuration with a L, S, S plus subwoofer setting. LFE as well as redirected bass goes to the mains. Also, R & L main bass is mixed with LFE and redirected bass and is sent to the subwoofer. This is standard Dolby Configuration 2.
Most receivers tend to use the Alternate Configuration 2 for L, S, S plus SW, along with a PLUS option of some sorts.
Anyway, my main speakers (3-way) have use a receiver EQ setting of -3dB @ 125hz setting. This gives the same RTA frequency response in room as compared with a SMALL 50hz crossover setting for my mains speakers. However, the LARGE main settings smooth out room modes more than a S, S, S plus SW setting.
Anyway, my subwoofer and my mains speakers are never in phase at MOST FREQUENCIES with either of my subwoofer amplifier POLARITY setting if I set my speaker distances to AS MEASURED distances. SMALL settings or LARGE settings did not matter. Out of phase is out of phase, but in/out of phase is still a frequency dependent issue. Most people probably use a sort of in/out of phase settings!
Without the use of True RTA, I could never have determined how to PROPERLY integrate the subwoofer with the main speakers as well as possible!