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Subwoofer configuration

mikko-pm, modified 13 Years ago.

Subwoofer configuration

Youngling Posts: 2 Join Date: 7/2/09 Recent Posts

I added a 7050b subwoofer to my 8030 stereo monitoring system. I don't have a measuring equipment available at the moment so I tried to make the adjustments by ear following the manuals instructions.

My control room is small (3.3 x 4.6 x 2.6m) but it's filled with bass traps and broadband absorbers and I've managed to make the room's response quite decent for professional working.

The problem is that I have very limited space for the subwoofer's placement and I cannot experiment without making some rearrangements in the room. Anyway, I placed it between the speakers about 50-60cm from the front wall, little bit off from the center and it sounded ok by itself. But when I added the 8030s (85Hz lo pass for sub, 85 hipass for speakers) no matter how I set the phase there was always a significant dip around the crossover frequency, or at least I just couldn't get satisfying settings. Also that frequency range is actually pretty good and flat without the subwoofer so it must be somekind of phase issue.

But, then I tried to remove the 85Hz hipass from the speakers and it started to sound much flatter and better.

Of course I have to do more listening tests and experimenting, but is there any pitfalls using the system like this if it turns out that it just sounds (or measures) the best that way?

- Mikko
christophe-anet, modified 12 Years ago.

Re: Subwoofer configuration

Jedi Knight Posts: 188 Join Date: 3/23/09 Recent Posts
Dear Mikko,

Thanks for your post. Nice setup you have indeed. First, some comments on the sub placement in the room.

> Try to move the sub right against the wall and do not leave the 50-60 cm from the wall behind the sub. That distance is a bit large and it would be best to minimize it. The off-center position from the symmetry axis in the room is very good. Keep that.

> For the connection scheme, more details are featured in our FAQ under: ... 50b-8020a/
It is recommended to set the "BASS ROLL-OFF" switch on the 8030A's to "ON" (switch 2) to make sure the LP and HP curves complement each other perfectly.

> Now, for the phase adjustment, you could follow the simple steps outlined in our Quick Setup Guide:
You should be able to find quite quickly and without measuring equipment a setting that gives you a flat response around the crossover region.

Let us know your findings!
Best regards,
mikko-pm, modified 12 Years ago.

Re: Subwoofer configuration

Youngling Posts: 2 Join Date: 7/2/09 Recent Posts
Thank you very much for your reply Christophe.

I'll come back from a vacation after two weeks and experiment more then. I'll let you know how it turns out.

- Mikko