First Measurement, doesn't look good.

This was a measurement of my JL F113.

It doesn't look good to me, your feedback?

[Otto]

Hi Michael,

Could be worse (EDIT: I mean that in the best possible way!). Can you play with placement at all, or is it stuck where it is? What's your crossover point? Were the mains on for this measurement?

The sub has freedom to move around the room. It was only the sub on for the test. I have it crossed over at LP Freq on the sub at 130.

[Otto]

Cool! I'd start by moving it around. I know, I know, it weighs 130 pounds, but you gotta do it! Is it in a corner? Try it in various corners, between the mains if there's any possibility you might leave it there, etc. Try two more location and let's see what you come up with.

The 130 Hz crossover is what made me think that the mains might be on; it's a little higher than we see around here. In the end, when everything's all set up and perfect, where do you think the crossover point will be? Where do your mains roll off, and what mains are you using?

You're on the right track.

I am using Dynaudio S5.4 as my main speakers. I am going to move it around the room this week. I also purchased 4 bass traps for the room, so hoping that will also help.

This is a picture of the front of my room.



I am looking for a new rack, and when I find it I will move my gear over to the side, and maybe then can move the sub between the mains.

Michael

[Wayne A. Pflughaupt]

I have it crossed over at LP Freq on the sub at 130.

Probably way too high, considering the capability of your speakers. Typically you want your crossover somewhere between 80-100 Hz.

I am looking for a new rack, and when I find it I will move my gear over to the side, and maybe then can move the sub between the mains.

That will probably give much worse response, but it never hurts to experiment.

Regards,
Wayne

[Otto]

Agree with Wayne. I'd go as low as possible (esp for music) on your crossover point. I'm not sure of your mains' low end rating, but they appear capable.

And, yeah, try that sub in a few different locations. Corner loading is usually the way to go, but the more data you have, the better.

[Wayne A. Pflughaupt]

Just remembered something from another discussion that might help. Ed Mullen eliminated a null at 40 Hz or so by moving the sub I think it was about 4 ft. from the corner, on the same wall where the front speakers were. It eliminated the depression, and was still close enough to the corner to get the loading benefits. You might try it and see if it helps.

Regards,
Wayne

[clubfoot]

1984911Porsche wrote:

The sub has freedom to move around the room. It was only the sub on for the test. I have it crossed over at LP Freq on the sub at 130.

Make sure you disconnect your mains and set your processor to small with sub to ensure processor xover to the sub.

What I did with my f113 was place it (with my son's help) in my seating location and connected up my RS meter on a low tripod, and ran sweeps with REW. I moved the meter around until I found a location between the front speakers and the back next to my equipment rack that gave the smoothest response that followed the ideal curve. Make sure you deselect ARO, full xover without any slope, no 25Hz trim, zero phase and no polarity,...to start.

I then swapped sub/mic positions and went from there,...allot of heavy lifting later, repositioning sub, mains and even moving my seating location, and advice from brucek and others here, and it sounds fantastic! And I'm not done yet. I have a BFD1124P on order.

Your room has a cathedral ceiling, it will be a tough beast to tame bass wise, without treatments.

[clubfoot]

Wayne A. Pflughaupt wrote:

Just remembered something from another discussion that might help. Ed Mullen eliminated a null at 40 Hz or so by moving the sub I think it was about 4 ft. from the corner, on the same wall where the front speakers were. It eliminated the depression, and was still close enough to the corner to get the loading benefits. You might try it and see if it helps.

Regards,
Wayne

I also had a dip between 40 and 50, ended up moving my seating location instead to cure it, because it showed up on the mains plot as well