Kinda Pi**ed

[kngadrok 10+ year member]

*sigh* Not this discussion again.
Sealed boxes give you a flatter, more natural response curve. Vented designs give unnatural spikes in output across the frequency spectrum (not a flat response). This is the main reason to chose sealed over vented for SQ applications (phasing is another reason).

JL Audio and I disagree on their wording. I know where they are coming from though: vented systems control cone motion more, so less cone motion = less distortion. In very simplistic terms, thats true. But for a given excursion level, vented enclosures (single reflex and dual reflex) do not output less distortion. Also, distoriton is a bit harder to hear in vented designs (especially bandpass). JL's wording is very misleading. For example, a bandpass enclosure is very good at masking distortion noises the speaker may be making. On the surface that seems like a good thing (as JL's wording implies), but it also leads to problems. You can be doing great harm to your speaker(s) and not even realize it with a bandpass.... the sub's in there banging away and all you hear is that boom-boom-boom one note wonder. The sub's in there stressing, and the box is making a single note sound that's overpowering the rest of the system, but hey JL Audio says its less distortion than a sealed system would be... must be true SQ there right?

"Distortion" can be described many different way. There's signal distortion, speaker distortion, and there's sound wave distortion. Disrupting a

ny of those three ultimately 'distorts' the final sound. *shrug*

So you see where it can be confusing and why the discussion keeps coming up.//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[xluben 10+ year member]

Sealed boxes give you a flatter, more natural response curve. Vented designs give unnatural spikes in output across the frequency spectrum (not a flat response). This is the main reason to chose sealed over vented for SQ applications

but wouldn't a properly designed ported box (ie. tuned low, more like a HT sub) merely extend the bass response deeper while keeping a semi-flat curve?

other than that i'll agree with you //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[audioholic 5,000+ posts]

but wouldn't a properly designed ported box (ie. tuned low, more like a HT sub) merely extend the bass response deeper while keeping a semi-flat curve?
other than that i'll agree with you //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Vented enclosures have a natural bump in output near their tuning frequency. Yes you can tune low so as to keep that bump as low in the spectrum as possible (less noticeable at 30hz than at 50-60hz). The problem is a vented box will still have this spike. It will also have a rather steep roll-off below the tuning freq. The gradual roll-off provided by sealed boxes actually matches the cabin gain of most vehicles pretty closely, leaving a fairly flat in-car response, well below where the vented enclosure would be unloading the sub.

 

[Phreaker 10+ year member]

Don't be an idiot...Don't use bass boost....if someone finds themselves using the bass boost to get their system as loud as they like or think it should be then that is a sign that you need a more powerful amp and subs that can handle that power....

Bass Boost FTMFL!

 

[lebomb 10+ year member]

Vented enclosures have a natural bump in output near their tuning frequency. Yes you can tune low so as to keep that bump as low in the spectrum as possible (less noticeable at 30hz than at 50-60hz). The problem is a vented box will still have this spike. It will also have a rather steep roll-off below the tuning freq. The gradual roll-off provided by sealed boxes actually matches the cabin gain of most vehicles pretty closely, leaving a fairly flat in-car response, well below where the vented enclosure would be unloading the sub.

Hense.....why I went from ported to sealed. I think the sealed enclosure sound better. There is less overhang on the bass, and all bass notes sound so accurate. To me, ported enclosures sound boomy tuned low, and when tuned high.....get loud with no LOW bass. JMHO. //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

 

[lebomb 10+ year member]

Don't be an idiot...Don't use bass boost....if someone finds themselves using the bass boost to get their system as loud as they like or think it should be then that is a sign that you need a more powerful amp and subs that can handle that power....
Bass Boost FTMFL!

X a big 2. I finally turned my OFF about 2wks ago //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif ......should have done it sooner. It sounds sooooo much better without it. I did have to boost the gain a bit, but it was all worth it.

 

[snick 10+ year member]

well i got it replaced

wow what a diffrence my roof shakes also my doors.

now the guy said since they dont have anymore 05 l5's i can pay the diffrence and upgrade.

so if i up my amp to the 750.1 and im thinoing about subs now

choices:

2 12'' 5500 in thunder form box

1 12'' 7500

1 12'' 9500

1 12'' l7

2 12'' cvrs

or mavy 1 12'' cvx

what would u guys get the will get louder then my l5

i have about 2 cubes to work with but i can eliminate the other back seat so i could have a possible of like 4ish

also can i get a small kicker 100.2 amp and through that two my stock speakers to make them louder or will the not hold it