Originally Posted by Kevin12586
Have you run a frequency response for your room? This would be one way to find out if you are indeed sitting in a null.
Originally Posted by dr_hsu
Nice house! What are the dimensions of the room? Remember to draw a sketch with dimensions. Do you usually listen with the door to the bedroom open? I would try closing the door to the bedroom when listening, and place the 15H behind your sofa. If you have sufficient space, place the sub so the woofer fires directly into the back of the sofa. Place it right behind your favorite spot. Do you have it as an end table now, or behind the sofa?
Yes, if your main speakers are 97 dB efficient, then the subwoofer level would need to be set higher to match it's sensitivity.
Thanks Dr. Hsu! I'll draw the diagram as soon as I have 5 mins (working all day).
I played with my 15H and SMS-1 this morning and I placed my HSU in the corner behind the couch. The couch is now about 38% from the back wall of the total room length (17'). I also played with the sub distance on the AVR. I had the max SPL around 80Hz with a 10' distance (YPAO settings), but made the bass sound buzzing around this frequency. In Transformers (chapter 8 - Scorpion Attack), the sound of the jet planes machine gun made a weird BBBBZZZZZBBZBBZBZBBZBZBZ. It sounded stressed out.
I adjusted the AVR sub distance back to 4.5', which is the physical distance of the sub from the LP and the bass was much more cleaner and seemed to have more extension... Although I don't know if this is just in my head... The same machine guns sounded more natural TRBTRBTRBTRTRBTRBTRBTRBTRBTTRBTRBTRBT, If you know what I mean...
I know run the sub volume gain around 10 o'clock.
I also tried the sub behind the couch firing into the LP. It sure shake the hell out of the couch but didn't give me the extension I like. It didn't sound as smooth too, but a lot more brutal... When Ironhide transformed, it felt like if someone was hitting me with a sledge hammer! It was not as melodic though...