2 X 11 cu ft Q18 slot ported subs build - Page 24 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #231 of 237 Old 09-19-10, 05:14 AM
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Re: 2 X 11 cu ft Q18 slot ported subs build

I'm not upto speed on what HPF you are using Graham, what did you get? In any case, it looks as though its working around 11/12hz to me.
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post #232 of 237 Old 09-19-10, 05:15 AM
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Re: 2 X 11 cu ft Q18 slot ported subs build

The HPF is working according to the graph.




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post #233 of 237 Old 09-19-10, 05:23 AM Thread Starter
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Re: 2 X 11 cu ft Q18 slot ported subs build

Here is my first sweep with a cut applied at 60hz and the subsonic filter set to just over half way.

Not sure what half way is but I presumed it was about 15hz.

How does this look with regards to the hpf.

This is with no EQ apart from Audyssey and the little cut I made. Pretty good I think.

cheers

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post #234 of 237 Old 09-19-10, 05:24 AM
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Re: 2 X 11 cu ft Q18 slot ported subs build

BTW, you can ignore the spike below 5hz, thats nothing to do with your HPF not working, if thats what your concern was.

Thats a pretty good response in my book HPF looks fine.
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post #235 of 237 Old 09-19-10, 05:30 AM Thread Starter
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Re: 2 X 11 cu ft Q18 slot ported subs build

I have just ran it with the speakers and this is really wierd. The speakers are really really loud. Volume is only on -25db so I don't know why they have come out at 95db when I haven't changed anything on the speaker levels.

Any ideas.

cheers

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post #236 of 237 Old 09-19-10, 06:00 AM Thread Starter
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Re: 2 X 11 cu ft Q18 slot ported subs build

I have increased the sub trim level to +3 from -5 so thats only 5db which is not too bad I guess. I have set the subsonic filter to 1/4 turn for the moment as I don't really need a hpf with my subs but it does sound less boomy but not sure if the EQ.2 has anything to do with that or not.

Here's my latest waterfall graph which looks much better.

I don't know what happened with REW as I checked the levels with the spl meter and they measured 74db for all five speakers.

cheers

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post #237 of 237 Old 09-19-10, 06:44 AM Thread Starter
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Re: 2 X 11 cu ft Q18 slot ported subs build

This is what I had the EQ.2 set on. I am guessing it is set at about 15hz. I haven't played with phase yet.

Perhaps someone could take a look for me.

cheers

Graham
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