Epik 15" DIY Ported Subwoofer - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 55 Old 06-23-12, 04:11 AM
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Re: Epik 15" DIY Ported Subwoofer

Looking good. Keep us posted on progress and especially how it sounds.

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post #12 of 55 Old 06-23-12, 08:04 PM Thread Starter
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Re: Epik 15" DIY Ported Subwoofer

Here are some new pics of today's progress ...

Quarter-round added to port opening ...
Epik 15" DIY Ported Subwoofer-p1030040.jpg

Internal bracing assembled and installed ...
Epik 15" DIY Ported Subwoofer-p1030041.jpg

Installation of front baffle ...
Epik 15" DIY Ported Subwoofer-p1030047.jpg

Top view of current state of sub ...
Epik 15" DIY Ported Subwoofer-p1030049.jpg


Only pieces left to secure are the subwoofer top and quarter-round around the front face. Then wood fill and sand all screw holes, round-over the front port opening for flare, install driver and amp and give it a test run. Next build session will probably be next weekend, tomorrow is booked.

Last edited by dboff01; 06-23-12 at 08:14 PM.
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post #13 of 55 Old 06-24-12, 04:54 AM
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Re: Epik 15" DIY Ported Subwoofer

A project near to it's close. A lovely sight to see.

cheers

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post #14 of 55 Old 06-24-12, 05:10 AM
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Re: Epik 15" DIY Ported Subwoofer

A project like this deserves taking a couple days off work to finish

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post #15 of 55 Old 06-24-12, 09:05 AM Thread Starter
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Re: Epik 15" DIY Ported Subwoofer

Quote:
hjones4841 wrote: View Post
A project like this deserves taking a couple days off work to finish
Fortunately, I have off for a week starting next weekend, so the fun will have to wait till then.

Last edited by dboff01; 06-24-12 at 07:59 PM.
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post #16 of 55 Old 06-29-12, 09:22 PM Thread Starter
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Re: Epik 15" DIY Ported Subwoofer

Decided to put a little thought tonight into the grill design as I hadn't really considered it yet. Compared a round driver cover vs rectangular, modeled both in Sketchup, and both the wife and I preferred the rectangular.

The plan is to cut an MDF frame covered in black speaker cloth and mounted by magnetic grill guides (which will lay under the wood veneer). I may do a soft round-over or bevel on the front of the frame for style. The magnetic grill guides and speaker cloth should arrive tomorrow from Parts Express.

The finished result should look something like this ...

Epik 15" DIY Ported Subwoofer-finished_cab.jpg
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post #17 of 55 Old 07-03-12, 08:05 PM
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Re: Epik 15" DIY Ported Subwoofer

Yummie! I think your subs would do a good job as my sub 3+4 in HT... Have to finish HT first and see what sub 1+2 produce.

Slowly building a 9.2.4 HT with 3 DIYSG Titan LX LCR, 2 LLT subs (done) and much, much more...
LLT design:
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post #18 of 55 Old 07-07-12, 07:25 PM Thread Starter
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Re: Epik 15" DIY Ported Subwoofer

A few more hours of work on the subwoofer today. Box assembly is basically complete, top has been added, 1/4 round added to front face, front port has been flared, screw holes filled twice with wood filler.

If I can get some time in tomorrow, I should be able to fire it up. I do need to add some additional length to the speaker cable from the Epik amp, as my subwoofer is 8" deeper than the Valor cabinet, and there isn't enough slack.

Here are some pics of today's progress.

Top added to box ...
Epik 15" DIY Ported Subwoofer-p1030109.jpg

All inner seams sealed with silicone ...
Epik 15" DIY Ported Subwoofer-p1030111.jpg

Quarter-round added to front face ...
Epik 15" DIY Ported Subwoofer-p1030116.jpg

All screw holes filled once with wood filler ...
Epik 15" DIY Ported Subwoofer-p1030120.jpg

Front port flared with 1/2" round-over bit ...
Epik 15" DIY Ported Subwoofer-p1030123.jpg

And all screw holes filled a 2nd time and sanded ...
Epik 15" DIY Ported Subwoofer-p1030129.jpg
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post #19 of 55 Old 07-08-12, 08:18 PM Thread Starter
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Re: Epik 15" DIY Ported Subwoofer

Finally got a chance to fire it up tonight. First impressions are good, however my 3 yr old was already asleep by the time I turned it on, so I couldn't really push it. I listened to Nemo's Darla scene, Iron Man Escape from Cave scene, and Polar Express Train Arrival scene.

Ran into a problem today in that my outer circle cutout was a bit too tight and not quite perfectly round as I used a hand-held router for the cutout. That required almost an hour of using a grinding bit on my drill to open the hole a bit more so the driver would drop in. Lesson learned is next time I'll take the time to create a proper jig and use the router for the circle cuts.

I figure I'll leave the sub in the room for a little while, measure the frequency response, to make sure its performing as I'd expected. Then I'll continue with the finishing, including building the grill cover, and installing the wood veneer.

The wife is a little peeved with the size increase. I told her she's only noticing because its not properly finished yet.

Here are some more pics of today's progress.

Did a bit more work properly finishing the port opening ...
Epik 15" DIY Ported Subwoofer-p1030130.jpg

Painted the back black to minimize attention (I won't be finishing the back with veneer) ...
Epik 15" DIY Ported Subwoofer-p1030131.jpg

Another pic of the face ...
Epik 15" DIY Ported Subwoofer-p1030132.jpg

Size comparison between my ported enclosure and the original Valor enclosure ...
Epik 15" DIY Ported Subwoofer-p1030133.jpg

A 2nd size comparison ...
Epik 15" DIY Ported Subwoofer-p1030134.jpg

A pic of the sub in its final resting place ...
Epik 15" DIY Ported Subwoofer-p1030135.jpg
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post #20 of 55 Old 07-10-12, 08:45 PM Thread Starter
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Re: Epik 15" DIY Ported Subwoofer

Performed some more spirited listening sessions, including Master and Commander First Battle scene and War of the Worlds Pods Emerging scene.

To my ears, output is significantly improved down low from sealed enclosure. Also listened to some bass heavy music (primarily through MOG streaming from Roku player) and didn't notice any degradation in sound quality as some have indicated when going to a ported alignment.

I also performed a frequency sweep (14 Hz to 160 Hz) using a test tones CD I created and my Radio Shack analog SPL meter. I don't have a laptop with proper soundcard capability for REW. I sat in the primary listening position in the room which is about 10 ft from the subwoofer for all measurements. I set my receiver volume to -30 and manually recorded the measured SPL for each tone, adjusting the frequency range on the meter as necessary. I didn't disable the main speakers and my receiver crossover is set for 80 Hz. I fed the raw values into the Excel spreadsheet from HTS (with meter correction factors included) and took the corrected values and pasted them into a new clean spreadsheet for graphing. I think I did all that right.

Here are the results:
Epik 15" DIY Ported Subwoofer-epik-15-diy-slot-ported-freq-resp.jpg

I see some good and some bad here. It looks like I'm getting good output down to under 20 Hz which is where the HPF is. This is the primary benefit of ported over sealed and the reason I wanted to do this project. The bad is it is not a terribly flat response, highlighted by the peak at 40 Hz. I don't currently have any subwoofer EQ capability and the position of the sub is fixed based on furniture layout. Perhaps a MiniDSP is in my future.
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