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Old 1st June 2012, 06:07 PM   #41
Veke76 is offline Veke76  Finland
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Default Eminence LAB 15 + Hypex DS8.0 sealed box

Here are some measurements made from my listening room of the finished Eminence Lab 15. +3dB EQ@20Hz and Xover@80Hz.

Check my youtube channel for videos of the subwoofer
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Old 1st June 2012, 08:53 PM   #42
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Nice build! I love the finished exterior! You should try a TQWP (no flare TH) or a T-TQWT (negative flare TH). A T-TQWT allows you the smallest enclosure of the 3 TH's for a given frequency response. I'm running a Kicker 15" L7 in a 222L T-TQWT. It sounds AWESOME! The way it pressurizes a room is incredible compared to a BR.
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Old 3rd June 2012, 09:23 AM   #43
Veke76 is offline Veke76  Finland
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Default Eminence LAB 15 + Hypex DS8.0 sealed box

Real room response seems to be F3 20Hz and ~100dB SPL@20Hz.

With rock music system plays nicely ~100dB and with bass tracks ~105dB. Main speakers don't like to played any louder.

...and the neighbours will like it...
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Old 18th September 2012, 04:57 PM   #44
Veke76 is offline Veke76  Finland
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Default Eminence LAB 15 + Hypex DS8.0 sealed box

Some problems...
a) Subwoofer enclosure suffered constant resonances and it moved on the floor. So I decided to remove those nice aluminium legs and added 5 pcs of very thick rubber mat pieces under it. Huge difference in the sound and no more movement. I have to think adding some inside also.

b) Plate amp gain ends up 3 o'clock position to keep up with mains. So basically I'm running out of gain. The input signals in both Left+Right RCA is too weak. I'm using speaker level to line level adapters there. My tube amp only has speaker outputs. It used to work with BK Elec XXLS400 and speakon wire quite ok. Perhaps stereo speaker level to mono line level adapter is what I need. I might have to test my subwoofer in another system to confirm that there is no problem with plate amp, wiring or driver.

c) My listening room yells for acoustic treatment and/or room-eq. I might buy anti-mode 8033 cinema.
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Old 18th September 2012, 07:17 PM   #45
NEO Dan is offline NEO Dan  United States
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Use the line level siginal before the tube amp...
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Old 19th September 2012, 06:01 AM   #46
Veke76 is offline Veke76  Finland
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Default Eminence LAB 15 + Hypex DS8.0 sealed box

Quote:
Originally Posted by NEO Dan View Post
Use the line level siginal before the tube amp...
Oh it's integrated tube amplifier so there is no pre amp.
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Old 19th September 2012, 02:01 PM   #47
tb46 is offline tb46  United States
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Hi Veke76,

Thanks for keeping us updated on your experiments. Is adding a pre-amp out / main-amp in jumper to the back of your integrated amplifier a realistic possibility? That would get you to the correct level, and would make it easier to add an external circuit into the signal path, e.g.: filters, LR summing-amp....

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Old 19th September 2012, 03:53 PM   #48
Veke76 is offline Veke76  Finland
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Default Eminence LAB 15 + Hypex DS8.0 sealed box

That might be possible...I should search this solution for Yaqin MC-10L from tube section.

We'll the speakers are in balance in 3 o'clock gain and are able to reach maximum volume togeather. I confirmed this feeding max line signal to subwoofer and measured with spl meter. Same volume in both setups. So the balance should be reached 11 o'clock position and for some crazy bass more.

The driver seems uber stiff to me. It needs lots of power to start pounding good. I think the Hypex is not enough for this job. PA-driver -> PA-amp.

The tone of bass might be tweaked by taking of stuffing. The bass seems to be disappearing in my room. I wonder could anti-mode help.
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Old 25th September 2012, 12:41 PM   #49
Veke76 is offline Veke76  Finland
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Btw. I use this to get the signal to sub Speaker signal to line level

Do you think it could be modified to smaller ratio and play louder?
Currently 90 dB spl and 0.030 VDC mains -> 0.003 VDC sub
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Old 26th September 2012, 12:11 PM   #50
Veke76 is offline Veke76  Finland
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Quote:
Originally Posted by Veke76 View Post
Btw. I use this to get the signal to sub Speaker signal to line level

Do you think it could be modified to smaller ratio and play louder?
I'll make a cable with R1=10kohm R2=10kohm ratio will be 2:1. I'll report back here if I get this right.
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