Is this how a Subwoofer Crossover is supposed to work?

hes all wrong dont listen to erik tufnel. subs should be custom tuned BY EAR. Same with the SNR1s. He tuned em by measurements and cant figure out why they sound so bad! 

In my opinion a good starting point would include seeing what the sub itself is doing without the room’s effects. Since this is a sealed-box sub, this will be fairly straightforward.

Measure the sub’s output with the microphone about 1/2" from the center of the cone. This is called "close-micing". The output from the cone will much louder than the room’s reflections at the microphone location, and will essentially overwhelm the room’s effects.

The difference in shape between that curve and your normal in-room curve is what the room is doing to the sub’s response.

Speaking of differences, the differences between your 50 Hz, 90 Hz, and 130 Hz curves look to me like they are "in the ballpark" for a 12 dB per octave crossover. The 50-Hz feature you are identifying as the "crossover point" is probably either a room interaction effect, a frequency response anomaly native to the subwoofer, or both. Having the close-miced curves in addition to your in-room curves will give you valuable insight into what is native to your subwoofer and what is caused by room interaction.

Pinwa, you mentioned that you are using two subs. Two subs can work together to give smoother in-room response than either one alone. How much freedom do you have to re-position your subs?

I disagree with Erik’s statement that "if you can’t integrate 1 sub, you can’t do2. " As the number of intelligently-distributed subwoofers goes up, not only does the in-room response become smoother, but the specific location of any one sub becomes less critical.

Duke
subwoofer designer and manufacturer

Kenjit,

We are all still waiting on you to post a blog post with details on anything you've bought, built or improved.

You are able to attack me only because I publish excessive details on what I've made.

Your only contributions to this forums have been random and self-contradictory theories with ZERO factual information.

Is this the week you believe in engineering, or the week you don't? Does that change hourly for you?

Best,

E

Pinwa,
Thanks for posting.
Curious. Did you mention what amp you are using?

I disagree with Erik’s assertion that "if you can’t integrate 1 sub, you can’t do 2. " As the number of intelligently-distributed subwoofers goes up, not only does the in-room response become smoother, but the specific location of any one sub becomes less critical.

Hi Duke,

I don’t disagree that things get smoother, but if you don’t know what 1 sub will behave like, you have no idea of the second is making things better or worse.

Attempting to set crossover points, and delays for both subs at the same time is a lot of work. Far easier to do after you’ve gauged the overall response of a single sub. The FR response of the OP using two subs was, I think you’d agree, pretty awful. Seeing a single sub’s FR would clarify much.

However, it is clear to you, and other experts that 2 subs are better than 1.  :)

Best,

E