Eminence LAB 15 + Hypex DS8.0 sealed box - diyAudio
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Old 21st March 2012, 10:52 AM   #1
Veke76 is offline Veke76  Finland
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Default Eminence LAB 15 + Hypex DS8.0

I'll be starting to design and build new subwoofer using Eminence LAB 15 driver and Hypex DS8.0 amp. The design will be sealed box of 35 - 108 litres. The box will be filled with damping materials. Driver is 600/1200W@6ohms and amp is 800W@4ohms.

It will be used purely to music and specially for rock and metal music. My listening room could be something like 16-20 square meters and walls are rock.

Qtc 0.707 is 35 litres F3=59Hz F12=30Hz
Qtc 0.585 is 61 litres F3=60Hz F12=26Hz
Qtc 0.503 is 108 litres F3=63Hz F12=23Hz

At 20Hz those all give pretty much same SPL and higher Qtc gives more SPL at top frequencies.

Anyone else played with the same driver? Given my room and taste of music which size box should I aim? I've heard good words from LAB 12 but nothing from LAB 15.

Happily I got some discounts from these...

edit: My sealed 50x50x50cm cube is rocking now and I've got some measurements in the end of thread post#54. I'm also interested how an upgrade of enclosure to TH or TQWP might work. I'll start discussing these in the end of thread.

Last edited by Veke76; 14th December 2012 at 08:57 AM. Reason: interest in TH and TQWP is rising
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Old 21st March 2012, 02:18 PM   #2
tb46 is offline tb46  United States
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Hi Veke76,

Have you measured the T/S parameters yet? I hope they are close to the spec sheet values.

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Old 21st March 2012, 03:19 PM   #3
Veke76 is offline Veke76  Finland
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Default Eminence LAB 15 + Hypex DS8.0 sealed box

Sorry I don't have equipment to measure T/S parameters. But looking at the site: Speaker Detail | Eminence Speaker I can see at cabinet design.pdf the parameters are already a little bit different with their test driver measured. I used the spec sheet.pdf parameters with simulating in WinISD.

I'm going add 24g/L of damping material in the box so that also changes the volume +20%. So I think I don't have to do more than 90L box.

They don't actually advertise this driver with sealed box but: "Subwoofer suited for small vented boxes and for Horn Loading". Well I'm more into making sealed and passive radiator boxes. I simulated this with 2pcs of CSS APR15 but extra cost didn't add up to me. Specially I'm going the place the subwoofer in the corner of rock walls so the room gain will be effecting the sound output. So I'm wondering which shape of the curves will give the nicest output.
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Old 21st March 2012, 03:44 PM   #4
tb46 is offline tb46  United States
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Hi,

Thanks for the additional information. I doubt that you'll notice much of a difference in the range of Q=0.5 to Q=0.7. Probably, building for the larger volume would be a good idea if you have the space.

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Old 22nd March 2012, 09:47 AM   #5
Veke76 is offline Veke76  Finland
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Default Eminence LAB 15 + Hypex DS8.0 sealed box

I attached .wdr file for WinISD
Attached Files
File Type: zip Eminence LAB 15.zip (635 Bytes, 141 views)
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Old 22nd March 2012, 02:47 PM   #6
mdocod is offline mdocod  United States
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Just because I love throwing monkey wrenches around...

The Dayton RSS390HF and TIT400 both look like more sub for less dollars but would need larger boxes than the LAB15.

When simulating a sealed enclosure, My suggestion is to pick your alignment such that you won't be leaving any Xmax unavailable within the available amplification, thermal power handling and frequency range you want to use.

In the case of the LAB15, for music perposes, I'd shoot for a Qtc below 0.6 to allow you to hit Xmax without running out of power or power handling.

Regards,
Eric
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Old 22nd March 2012, 03:59 PM   #7
tb46 is offline tb46  United States
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Hi mdocod,

I'll attach a Hornresp excursion plot for two of the cases Veke76 has in Post #1. Power=600W into 6 Ohm.

Regards,
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File Type: jpg Xmax_108_v_35_litres_600W_6_Ohm_small.jpg (31.2 KB, 913 views)
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Old 22nd March 2012, 04:07 PM   #8
Veke76 is offline Veke76  Finland
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Default Eminence LAB 15 + Hypex DS8.0 sealed box

Hi. If I set max excursion at 18Hz so I get these:

Qtc 0.707 max excursion @ 750W
Qtc 0.585 max excursion @ 410W
Qtc 0.503 max excursion @ 270W

I think I avoid the smallest box. Qtc 0.656 and 42L would give max power 600W

Last edited by Veke76; 22nd March 2012 at 04:17 PM.
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Old 22nd March 2012, 04:33 PM   #9
tb46 is offline tb46  United States
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Hi Veke76,

That sounds right. Have you tried a BP4 enclosure?

Regards,
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Old 22nd March 2012, 06:05 PM   #10
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I have measured Lab-15 and there is some differences:
Qt 0,283
Qe 0,299
Qm 5,39
Vas 124 liters
Re 4,88 ohm
Sensitivity (1watt) 90,32
BL 28 N/amp
Mms 300 gram
Le 5,79 ()

A really nice woofer!

Dag
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