Fine Tuning My Sub.

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razorbacx

Copper - Posts: 91

Joined: June 08, 2003

Location: United States

Posted: June 08, 2004 at 12:17 PM / IP Logged

I've got an Xtant Z104 10" sub sitting in a Q-Logic QLH-1.0010SE enclosure. Xtant recommends .75 cuft for a sealed enclosure, however, my box is 1.00 cuft. Can I adjust the overall cuft by adding fill to the box or am I stuck where I am at? I want my bass to hit harder rather than sounding a bit "BOOMY" like it currently does. I believe and please correct me if I am wrong, that by addressing the internal size of my box I can get my bass to hit harder and to be more directed.

For those that need to know here are my specs: 1996 Honda Accord EX 4 dr, JBL GTO635's in the front doors, MB Quart DKC 169's in the rear deck and all ran off a US Acoustics 4050 (4x50 rms) amp. Coustic 161SE amp bridged (mono) running my sub. Pioneer Premeir DEH-P550MP Head Unit.

As always, I appreciate your assistance.

Kind Regards,

Razorbacx

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: June 08, 2004 at 12:24 PM / IP Logged

Adding poly fill will make the enclosure function as if it was larger, not smaller. If yu want to cut down the effective internal volume of the enclosure, add something solid like a wooden block or MDF cubes or even bricks, glued or screwed to the inside walls. Add enough to take up 1/4 the available space to cut it down from 1 cuft to 0.75. And yes, you are correct that a smaller enclosure will add punch to the bass and remove boom, and also enable yur speaker to handel more amplifier power.

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razorbacx

Copper - Posts: 91

Joined: June 08, 2003

Location: United States

Posted: June 08, 2004 at 12:56 PM / IP Logged

DYohn,

Thanks for the assist!

Razorbacx

pureRF

Silver - Posts: 619

Joined: July 22, 2003

Location: United States

Posted: June 08, 2004 at 2:12 PM / IP Logged

Build your own box out of 3/4 MDF with braceing. You will be abel to tell the biggest diff.

dream it, build it, fiberglass it

customsuburb

Gold - Posts: 1,813

Joined: January 17, 2004

Location: United States

Posted: June 08, 2004 at 3:17 PM / IP Logged

pureRF wrote:

Build your own box out of 3/4 MDF with braceing. You will be abel to tell the biggest diff.

Yes, exactly. Most Q Logic boxes are made out of 5/8" (yuck Fine Tuning My Sub. - Last Post -- posted image. ) mdf instead of 3/4."

djMINIoompa

Copper - Posts: 125

Joined: May 01, 2004

Location: United States

Posted: June 08, 2004 at 5:45 PM / IP Logged

customsuburb wrote:

pureRF wrote:

Build your own box out of 3/4 MDF with braceing. You will be abel to tell the biggest diff.

Yes, exactly. Most Q Logic boxes are made out of 5/8" (yuck Fine Tuning My Sub. - Last Post -- posted image. ) mdf instead of 3/4."

Yes. i agree 100%. Q-logic make cheap boxes and if you want your sub to hit nice, just build your own box the the exact specs that you need. You could put blocks in the box, that would do the job, but just build a box and do it rite. It will make a big difference.

chasesaccessori

Copper - Posts: 198

Joined: August 22, 2002

Location: United States

Posted: June 08, 2004 at 6:04 PM / IP Logged

Razor,

Another way to make this box work without building a new box is to add a coating to the inside of the box. (I have done this before to make a customer happy and it really works)

first I would add a set of 2x2's screwed to the inside of the box to take up the cu airspace needed. then...

Go to your automotive parts place and buy a can or two of some spray on bed liner. I am able to get some at my local wal-m***. In an area and while wearing cloths you don't mind getting messy, spray the insides of the enclosure in several layers with the liner. If you take your time you can build up a ¼ layer on all walls of the box. I do this liner method with even my new boxes just to add that extra vibration control to the box and makes the box about 1" thick.(I spray the ¾ MDF while still in sheet form for good even layers and remove the liner material from the butt or lap joint area so the glue bonds good)

(owner/installer)

Chase's Accessories

Ridgecrest, CA

in business since 92

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sandt38

Copper - Posts: 60

Joined: May 25, 2004

Location: United States

Posted: June 09, 2004 at 6:23 PM / IP Logged

2 thoughts really, and maybe a suggestion at the end ;)

The enclosure is weak, you need to strengthen it. Brace it some. While I would prefer a differant enclosure, this will work.

Second, decreasing enclosure size will decrease sound quality, and increase the boomyness of the sub.

Try to take the gains down some. Maybe you are simply overpowering your front stage, and the bump at resonance of the vehicle is just too overpowering.

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: June 10, 2004 at 8:16 AM / IP Logged

[QUOTE=sandt38]2 thoughts really, and maybe a suggestion at the end ;)

Second, decreasing enclosure size will decrease sound quality, and increase the boomyness of the sub.

QUOTE]

Uh, no. Actually that is backwards. Larger sealed enclosure will create a more boomy sound.

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Steven Kephart

Platinum - Posts: 1,737

This member consistently provides reliable information

Joined: November 06, 2003

Location: Oregon, United States

Posted: June 10, 2004 at 11:46 AM / IP Logged

DYohn wrote:

[QUOTE=sandt38]2 thoughts really, and maybe a suggestion at the end ;)

Second, decreasing enclosure size will decrease sound quality, and increase the boomyness of the sub.

QUOTE]

Uh, no. Actually that is backwards. Larger sealed enclosure will create a more boomy sound.

I think what he is talking about is that when your enclosure get's smaller, Qtc. increases. I had a great quote by my boss on this topic and was trying to find it, but couldn't. The boomy sound you are talking about is from lessening higher frequency peaks, and increasing the lower extention. That can make it sound a little more boomy.

Steven Kephart

Adire Audio

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Fine Tuning My Sub.

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