Axiom Home Page Forums General Discussion Advice from Axiom Owners Crossover on the EP subs.

Mojo

Your room sweep is looking better at the higher crossover compared to the first graph you posted but eliminating that 50hz peak is where you should focus your effort. It is likely making your bass sound boomier than normal. You may want to consider an equalizer to tame that peak. I currently use a Velodyne SMS for that problem but have had good experiences with the less expensive Behringer Feedback Destroyer DSP1124P.

As for those pesky nulls, don't even think about Audessey equalization or any equalization for that matter. Room treatments are your only viaable option. Its normal to be concerned about aesthetics or WAF when it comes to treatments but properly done they can actually accent room decor. I'd start with the easy stuff, bass traps in the corners. Keep posting those graphs its neat to see your progress.

Oh yeah, the other suggestion: get a properly placed second 500 and don't look back. That relatively whimpy Sony sub won't cut it for what you are trying to accomplish.

My rec room is definitely more lively than other rooms in my house. No question about that. And yes, the clap test does indeed reveal this. However, I don't think it's too lively as evidenced by my reverb time below.



Regarding the treatment of the first reflection points, I agree that the ceiling and floors should definitely be treated. And perhaps the laterals need to be treated for some rooms but the question is "how much treatment?". I say perhaps because if you have your speakers toed in "severely" and they are far enough from the side walls, then you may not have anything to worry about.

The lateral reflections give rise to a sense of spatiousness. Of course if they are too live, that's not good either. In my room, with the amount of toe-in from the fronts and the distances to the side-walls, I calculated that I am getting the right amount of spatiousness. And my ears tell me so too. The ceiling area between me and my M80s however is another matter and I need to take care of that right away.

Come to think of it, if you listen to all of your audio in multi-channel, you may want to add "a lot" of treatment to your room since you don't need to rely on any reflections for ambience.

After I finish this project, I'll be able to write a thesis on room acoustics .

Hi Jake,

Those are good points about the sub (I have a 600 BTW) and the 50 Hz peak. Thanks. I'm still not sure about artificial room treatments though. And yes, I've been thinking about Velodyne and Behringer.

I'm posting this stuff 'cause I think it's interesting and it might help others too. Thanks for reading.

Randy, looking at your graphs, I may just have to buy a few bass traps. Before I do, does anyone know of anything I can use to simulate them?

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If you get the time, can you do that and let us know your opinion of multi-zone EQ vs. "sweet-spot EQ"?

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My experience with the Audessey vs. the single spot EQ, is you still get your main sweet spot with the Audessey but you also get 4 or 5 other positions around the room that sound almost as good. With the old system the family would have to pry me out of the center couch sweet spot, now I can sit anywhere in the room and not feel I'm missing anything. It probably doesn't do much for room response but it does make it much more enjoyable when you can sit in other locations and still have great sound.

Mojo,

Items to simulate, that is a good question. It might be hard to find something with the exact absorbtion as 703. Lets seeee....hmmm

maybe a bunch of bean bags stuffed in corners, or a bunch of thick removable seat cusions from a couch stradleing the corners, or you could go to a local home improvement store and buy some roles of insulation (in plastic bags) and just stack them in the corners from floor to ceiling. When your done you could return them since you didn't open the bag and you would have a receipt. I'm sure there is something else you could try, maybe lean some roles of unused carpeting up in the corners left over from when you carpeted your house.

John, I understand your opinion about "auto setup" from receivers, but have you actualy used Audyssey? I agree with you on past versions, but I have really read a lot of good reviews and feedback that this truely is a different animal from previous products.

Audyssey company actually says that it is not a replacement for room treatments, but when combined gives you unbelievable results.

The insulation idea is a good one.

As for carpet, it just so happened that the one we liked was the most expensive one in town. I could have purchased three more EP600s if it wasn't for the carpet . So, I bought just enough carpet to do the least amount of damage to my wallet and ended up with a 3'X6' patch left after install.

sleeping bags, pillows, ha ha my mind is brain storming ideas.

Do you still have that patch?