2 X 11 cu ft Q18 slot ported subs build - Page 9 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #81 of 237 Old 02-03-10, 01:54 PM Thread Starter
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gperkins
 
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Re: 2 X 11 cu ft Q18 slot ported subs build

Dylan,

I will be finishing the second sub this weekend. I am running one sub and will Audyssey it and EQ tonight to see what it sounds like with just one. I will first see what way around it the best and then run Audyssey to see how it improves, then run the filters with the BFD to clean up.

cheers


Graham
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post #82 of 237 Old 02-03-10, 02:59 PM Thread Starter
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Re: 2 X 11 cu ft Q18 slot ported subs build

I have just re run a new measurement from my seat which I use as my listening position and it looks pretty impressive.

I will try a few more locations to see how others fair. This is with the sub facing towards the left front speaker still.

Duh! forgot to disconnect the speakers but that is it with the sub and speakers with no EQ or Audyssey.

cheers

graham
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post #83 of 237 Old 02-03-10, 03:06 PM Thread Starter
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Re: 2 X 11 cu ft Q18 slot ported subs build

Here is my sub only one with no EQ and Audyssey from my seat which is left of the sofa.

There is a hump at about 160hz which I am guessing is my port resonance. If so will this be an issue. I am crossing at 80hz. The sub/speaker graph looks ok.

cheers

Graham
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post #84 of 237 Old 02-03-10, 03:08 PM
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Re: 2 X 11 cu ft Q18 slot ported subs build

Quote:
Moonfly wrote: View Post
Plug the port, see what happens.
I have many times... I guess I should know it's not port cancellation, because it gets quieter with the port plugged yet excursion remains exactly the same... the.... here comes the cat! I'm playin it now to retest, and here came my buddy stickin his head right to the sub till it tickled him too much and he shook his head and ran off... lol...anyway, the excursion stays the same, but interesting the sub pushes outward a touch and remains out while plugged... then unplugging again the sub moves inward and plays back and forth in that range again. Somethin ya just gotta see for yourself, seen it many times before as I always play... plug un plug.

So it's not cancellation, it happens throughout the whole house so not black holes.... driver? no... cuz it moves.

ugh
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post #85 of 237 Old 02-03-10, 03:12 PM
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Re: 2 X 11 cu ft Q18 slot ported subs build

That is looking like a good responce there Graham.
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post #86 of 237 Old 02-03-10, 03:13 PM
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Re: 2 X 11 cu ft Q18 slot ported subs build

OK, doing it for all 4 tones:

On all 4 tones, excursion stays the same... maybe plugging on the very bottom tone increases excursion a touch, ahrd to tell for sure. Plugging the box with my old cone must push a touch of air in the box and seals it off so the sub gets pushed out... makes sense.

The highest note seems a touch louder plugged, the next 3 get quieter when plugged, of course the lower the tone the quieter it gets when plugged.
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post #87 of 237 Old 02-03-10, 03:23 PM Thread Starter
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Re: 2 X 11 cu ft Q18 slot ported subs build

This is again no EQ or audyssey with the sub turned at angle facing towards the listening position.

cheers

Graham
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post #88 of 237 Old 02-03-10, 03:35 PM Thread Starter
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Re: 2 X 11 cu ft Q18 slot ported subs build

Here's a graph with sub and speakers with no EQ or speakers. Pretty impressive and ALOT better than what I had with no EQ with the sealed sub.
I could probably get away with just running Audyssey and no filters. The sub is at an angle from the corner.

cheers

Graham
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post #89 of 237 Old 02-03-10, 04:20 PM Thread Starter
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Re: 2 X 11 cu ft Q18 slot ported subs build

Ive just re ran Audyssey and I think its done a pretty rubbish job to be honest. This will need EQing quite a bit. The first on is sub only with Audyssey Multi EQ on and no dynamic EQ and the second is sub and speakers.

cheers

Graham
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2 X 11 cu ft Q18 slot ported subs build-audyssey-sub-speakers.jpg  

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post #90 of 237 Old 02-03-10, 04:33 PM Thread Starter
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Re: 2 X 11 cu ft Q18 slot ported subs build

Here's the sub only with Audyssey on and off. The blue is off and the red is on.


cheers

Graham
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