How can I impove this sub enclosure for my home theater ? - AVS Forum
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post #1 of 26 Old 02-18-2014, 02:11 AM - Thread Starter
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I just picked up this sub / enclosure combo for a great price but unfortunately it's more designed for SPL (used to be in a car) and not so much for sub 30hz movie watching. Originally intended to ship an SI 18" from the states due to the lack of 18" subs here in New Zealand. But high shipping costs (almost the same as what I bought this setup for!!) led me down this path instead.

I'm looking for some advice on how I could possibly tweak this enclosure to sound cleaner and deeper for my movies ? I'm pretty sure I'm going to be limited by my subwoofer specs, you will see my fs at 37hz is quite high.



But I was wondering if the knowledgeable enclosure builders out there could suggest what I could change to improve its sound ? Should I add some insulation ? if so how much ? What would plugging the ports do ?

I have tried a test tone and it sounds really nice down to 27hz but anything less than that the sound level drops off and quality diminishes.

The enclosure dimensions are 95cm x 60cm x 44cm (excuse the metric I'm from New Zealand) converting these units I get 8.85 cu ft (outside dimensions).

I'm running a Behringer ep2500 bridged @ 4ohms, sub is rated 1800w so a good power match, easily pressurizes my high 25ft ceilings.

Pics:

Excuse all the glue marks.



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post #2 of 26 Old 02-18-2014, 03:03 AM
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What brand is it?
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post #3 of 26 Old 02-18-2014, 11:17 AM - Thread Starter
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Blaupunkt VPW-460
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post #4 of 26 Old 03-19-2014, 12:41 PM
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I have just built box and installed one of these And it runs flat to 20hz and rolls off completely at 15hz but can sure be felt at 16hz. Box is just over 7ft3 excluding 2 rectangle port 70mm by 332mm at 1100mm length. This box has the best control over the sub I've ever seen. Running soundstream x3.60 amp at 1ohm at over 2000w rms.
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post #5 of 26 Old 03-19-2014, 01:14 PM
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looks nice with both ports !! should sound good too....
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post #6 of 26 Old 03-19-2014, 05:23 PM
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New here...will get used to it and post pix etc wink.gif. Doesn't sound boomy like an 18" but man it works the bass up high and low...very surprised as I was planning to split the bass stage with a 15" to do 80hzish up and canned that idea!!! Thanx for the message.
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post #7 of 26 Old 03-19-2014, 05:27 PM - Thread Starter
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Quiklux its nice to know I'm not the only one around here with this sub. The person who had this sub/box combo used it for car audio sound off competitions it's tuned to approx 41.5hz!! I will need to make a new enclosure if I want it to respond well under 30hz. Some long ports like yours are definitely going to be needed.

Care to post some pics of your setup ? How large is your living room ?
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post #8 of 26 Old 03-19-2014, 05:34 PM - Thread Starter
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Yes I have a 10" active sub that I was going to keep but the 18" is on such another level there's no point in keeping it.
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post #9 of 26 Old 03-19-2014, 05:46 PM
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post #10 of 26 Old 03-19-2014, 05:48 PM
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I van installed it in my workvan. Man alive if you put this in a house it would destroy it....as it is incomplete build atm it flexs the whole van panels and dash move up and down lol.
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post #11 of 26 Old 03-19-2014, 05:50 PM
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I can send details on the build to copy but as it is 900 high and 750 wide you would need serious room in house and may need to double check forums on room acoustics similar to what you have.
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post #12 of 26 Old 03-19-2014, 05:55 PM
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"If you build it they will come"...mostly neighbours to tell you off!!!!
I ran test specific frequencies at 16 thru to 20hz (no treble at all) with all doors and windows closed and neighbour and missus seriously thought it was a quake....I was kennelled for a day got that!!!!
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post #13 of 26 Old 03-19-2014, 05:59 PM
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"Kennelled for a day for that"...not >"kennelled for a day got that"<<
I tried to look sorry when they both told me off but I just couldn't be!!! biggrin.gif
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post #14 of 26 Old 03-19-2014, 10:35 PM
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Hope u build it vanilla as it will be more than enough. Could hv my box out and in your house fast if you live in Welly lol!!! I'd love to try it.
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post #15 of 26 Old 03-20-2014, 05:28 PM - Thread Starter
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I'm still torn between keeping this sub or going for a sub with lower Fs and higher Xmax. I figure your apparent low frequency response is helped by the small area it's placed in compared to a large living room area which requires a lot of air displacement. Of course I'm still convinced that an enclosure like yours which is tuned to a much lower frequency would work wonders smile.gif It's a shame I live in Auckland, I'd be keen to check it out. Although the person I bought this off had it installed in a station wagon and I thought it was going to blow the roof off when he gave me a demo !
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post #16 of 26 Old 03-20-2014, 08:51 PM
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At 18hz silent wind blows by me in the van with no trouble...or port noise. It also is very flat right up to 125hz without playing with equalisers etc. obviously your call on it wink.gif
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post #17 of 26 Old 03-21-2014, 01:38 AM
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I will have the van in a big concrete walled shed next Saturday for tuning...still got one front door to dynamat and install splits before then. Once in shed I'll run a test sweep on bass and let u know what it does from 20 ft away so I can hear if it fills the shed. wink.gif. If it does any good at all
it will work for you. Let the games begin!
Might try park it up next to house tmw with van side door open next to house door and see what goes. Thanx for the incentive to try ideas bro.
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post #18 of 26 Old 03-21-2014, 04:15 PM - Thread Starter
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Yeah that sounds like a good idea mate good luck. I'm guessing you have lots of space between you and your neighbors. I live right next to my neighbors so I can only belt it for 30secs or so. At least when I listen to movies with lots of sub 30hz listening it not as apparent outside compared to a techno thump which would have my neighbors at my door in seconds haha
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post #19 of 26 Old 03-21-2014, 04:32 PM
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I usually tune
cars out in the open with windows down. If it sounds good
10mts away it
Sounds good
Inside. With house gear I go outside to see what works best for neighbours and compromise or shield
Walls or move sub a bit....or just ask them if they have trouble with it all or times
I need to keep it down...surprising what u get away with if u ask first!!
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post #20 of 26 Old 03-21-2014, 05:49 PM
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If you want to do this right then you need to download winISD and get the T/S specs on the driver and input them into the winISD program to see what the optimal enclosure specs are. I can tell you straight up that most 18's will stomp most 15's, assuming you build the right box. There is a lot more to this than just using any various box with any various driver.
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post #21 of 26 Old 03-21-2014, 06:25 PM
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Spot on. I built my off free winisd and cross referenced heaps of other forum material and one other program. Also took the general rule of 12 sq inches of port section per cubic foot of box volume. I was still quite nervous as the cost to build
Was a lot of money and time but victory loves preparation!!!
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post #22 of 26 Old 03-29-2014, 06:33 PM
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Thanks to all the posts on avs site wide it helped me build a killer system for the 'workvan'. When I get new house sorted oc I'm gonna build a cinema!!! Tho half of what made mobile build work already came from treating van like a small room!! 4 6by9s boxed, pair of 6" components and an 18" sub. Clean rms wattage 3600 at 11.5 volts. Runs flat on Hu equalizer too!! Yep...upgrades for electrical coming, but even at that it has impressed experienced ppl very well. Thanks once again everyone as without help and advice you must resort to trial and error.
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post #23 of 26 Old 03-30-2014, 02:27 AM - Thread Starter
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No problem Quicklux. I'm now running a boss crossover unit for my home theater sub. It's designed for car audio 12V so I'm using a server PSU which puts out 12v. These power supplies are beasts, I have 2 rated at 930watts and 6 rated at 535watts so will happily run car audio amps especially when connected in series. You could conisder doing this Quicklux if you have any left over car audio gear for your home setup. I've seen 1000watt amps connected with little or no volt drop, you can also boost the voltage on the HP PSU's up to 13.4volts with just a simple shorting of the pins.

The boss crossover has made a massive difference and also has a feature to boost gain down to 25hz which helped by sub 30hz roll off big time. I don't think I will need a lower Fs sub anymore because the infrasonic range is rattling my house apart. My position in the room makes a dramatic difference so I may need to consider moving the box and/or installing room treatments.
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post #24 of 26 Old 03-30-2014, 09:35 PM
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Lmao that's gold!! Nice work mate. I will file that info and rattle it around my OCD head! Since last post I had a dj/music setup guy to have a listen and he just closed his eyes and loved it...all running flat on eq! Same response from
3 installers and 2 owners of sound shop. Limitations are huge incar with so much glass and plastic and panel flex (on 3rd box of dynamat to settle the resonance down!!!). Have a 15"
Sub and 4 6by9s left over and home amp. Had to Renew 6by9s as I lost 3 tweeters in the game lol and will replace them when I'm not so impatient.
Have a sony surround system (unused at present) with 2 powered subs...for fun I'm gonna see if I can rewire them to power 15" dvc sub. What's life without a challenge.
What u doing with 18" now? I have a sad idea to put the other 6by9s and it in van lolol...just don't know where.
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post #25 of 26 Old 03-30-2014, 09:54 PM
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My bad. U using the 18" still but not renewed box? I post off phone and lose some details at times. If you r using it I'd love to send box details and for a couple Hundy you could make it insane. Btw what is your cut off frequency on it? I can run 80 100 or 125hz and as I have good midrange it makes little if any diff. Once I get more used to it tho on certain songs it will
Count.
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post #26 of 26 Old 03-31-2014, 01:13 AM - Thread Starter
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At present my enclosure is plugged up so its behaving like a fairly large sealed enclosure. We are all audio enthusiasts here so I can only imagine I'll improve my sub/enclosure long term. Short term, I'm very content so no immediate plans to change the enclosure. Crossover is at 85hz. It should really be higher until I upgrade my fronts but I have a nice 10" on the other side of the room that I run 180deg out of phase.
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