Speakers to alleviate room anomolies


I have a suckout of 8db from 58 -70 hertz which is taking the life out of the music. I currently have Von Schweikert VR7SE an added a velodyne dd18 which took away the problem. It gave the bass energy in my room of 30 x20x10. It seems I do not need the big cabinet speakers[VR7SE] if the woofers aren't throughing enough. Speakers with active woofers like the evolution acoustics mm2 have been recommended. Any other ideas of speakers in conjunction with the velodyne dd18 to make my room sing again.
128x128snook2
Room effects dominate in the bass region, and the peak-and-dip pattern is a function of room dimensions (and damping), source location, and listener location. In other words, move the bass source(s) and/or the listener and you re-arrange the peak-and-dip pattern.

One solution is to have as many bass sources as is practical, and have them spread asymmetrically as far apart as is practical. This way each bass source interacts with the room differently, producing a unique peak-and-dip pattern at any given listening position, and the sum of these dissimilar peak-and-dip patterns will be smoother than any one of them no matter how optimally placed. And if you want smooth bass over a large listening area, this technique is more effective than equalization (it is arguably more effective than equalization for a single sweet-spot as well, based on comments from people who have tried both).

If I understand correctly, by adding the Velodyne you now have three bass sources in the room, so that might be the reason why it smoothed out the bass for you. If you keep the Velodyne and go with small speakers that don't contribute much in the bass region, you may well end up back where you started.

In my opinon the theoretical ideal is multiple subwoofers scattered around the room, and they can be fairly small. In this scenario the main speakers don't need to carry the deep bass, so they can be smaller... but for aesthetic reasons few people find it practical to go the multisub route.

Duke
dealer/manufacturer
Duke with the posters question in your opinion would you still play full range on the main speakers or cutoff the lows and direct them to the subs;I would think this would be the correct choice but I thought I would see what you thought.
Adding the subwoofer did correct the problem. It doesn't seem right having a huge expensive main speaker not doing the job.There are 2 twelve in woofers on each side not providing punch.I also thought I didn't have enough power to drive the woofers on the VR7's but all my other main speakers[Dunlavy 5] seem to have the same bass shy charateristics. Its time I get Duke here to figure this out.
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Bob_Reynolds: I respectfully disagree. There are always spots in a room that cause nulls and bumps as well. Finding a proper place for the listening position as well as for the speakers is critical. Having a speaker that is adjustable in the bass region certainly will make it much easier to dial the system into the room.

Snook2: Visit our website which has very complete suggestions for speaker and listening position placements.

http://evolutionacoustics.com/initial_speaker_placement.html

You will find this under the support tab on our website. You might find if you take the time to follow the instructions on-line, that you might not even need a subwoofer. You might also find that your existing speakers do the job you expected.

Hopefully that helps.

Jonathan Tinn
Evolution Acoustics