Kinda Pi**ed

[snick 10+ year member]

well i posted on here a lil bit ago about a ported box for a l5 10''.

i made it 2 cubes at 32hz

the thing is is that it hits the lows pretty good but my sealed box sounded kinda louder.

i have subsonic on

one of my lil wires on the sub that go to the middle of the cone is broken.

i dunno if that is why.

i have bass boost all the way,

gain about in between 1/2 and 3/4 up,

and x-over at about the middle

the amp i have is a kx400.1

Click to read more...

 

[snick 10+ year member]

so thats prolly way its a 4 ohm, one of the wires is broken on half.

i will have to replace it wed.

 

[DaveT 10+ year member]

not to mention bass boost being all the way up lol

 

[LeofromtheH 10+ year member]

plus

bass boost all the way up(or on at all for that matter) = bad

 

[snick 10+ year member]

i thought i needed bass boost to get that extra thump.

so it will hit harder without bass boost.

should i turn bass boost all the way down on my amp and head unit

 

[DaveT 10+ year member]

i thought i needed bass boost to get that extra thump.
so it will hit harder without bass boost.

should i turn bass boost all the way down on my amp and head unit

it will give you "extra thump" but also alot of extra distortion

 

[DaveT 10+ year member]

bass boost adds nasty harmonics to the signal.
But seriously, you must fix that tinsel lead.

you beat me you s.ob

 

[baseballer1100 5,000+ posts]

Yeah the tinsel lead is kinda important in getting that extra "thump"

 

[snick 10+ year member]

i will try and get a new one wed. if i got time, and let u guys know how it sound's with a new sub

but did i make the right desicion goin to 32hz

 

[zachzchw 5,000+ posts]

i will try and get a new one wed. if i got time, and let u guys know how it sound's with a new sub

but did i make the right desicion goin to 32hz

Set your equipment up properly, or youll end up needing quite a few new subs.

 

[luvinthebass 5,000+ posts]

if it's in a ported enclosure you don't even need to use bass boost since the bass in a ported enclosure is less distorted then a sub in a sealed box.

 

[60ndown 10+ year member]

if it's in a ported enclosure you don't even need to use bass boost since the bass in a ported enclosure is less distorted then a sub in a sealed box.

= wrong.

 

[kngadrok 10+ year member]

if it's in a ported enclosure you don't even need to use bass boost since the bass in a ported enclosure is less distorted then a sub in a sealed box.

Dont meant to Hi-jack the thread, but

Im confused, if ported enclosures give you less distortion from the bass, then why is it that sealed = SQ?

 

[xluben 10+ year member]

= wrong.

Distortion

At moderate power levels all of these enclosure types exhibit pretty

decent manners. The ported box and the bandpass designs produce less

distortion than the sealed box, but the difference is marginal.

At higher power levels things change considerably. The dual-reflex

bandpass, due to the fact that its ports control cone motion over a

wider range of frequencies, produces the least distortion and exhibits

the best power-handling characteristics. The ported enclosure and the

single-reflex bandpass also do a very good job producing high-levels of

undistorted bass output, again due to reduced cone motion in this

frequency range. Bringing up the rear in this category is the sealed

enclosure, which produces higher levels of distortion at high power

levels. There is a common misconception that ported designs produce

more distortion than sealed boxes. As you can see this is not entirely

accurate; it depends on the frequency and the power level.

Transient Response

Transient response refers to the ability of the subwoofer system to

reproduce quick changes (transients) in the program material

accurately. This is often interpreted as "tightness" or "looseness"

which is maybe a dangerous terminology since many people are more

influenced by tonal characteristics when asked to qualify the

"tightness" of the bass. Transient response is actually a function of

accuracy in relation to time rather than frequency. In music, sounds

like drum strikes and quick bass guitar pulses are good tests of a

subwoofer system's transient performance. A system with good transient

response will reproduce these sounds with clear, "tight" definition. A

system with poor transient response tends to blur these sounds over

time, due to the speaker's inability to stop and start quickly enough

to react to the signal accurately.

It is generally accepted that an optimized sealed enclosure exhibits

the best transient response characteristics. The control provided by

the air-spring in a good sealed system contribute to generally

outstanding transient behavior (at very high power levels, the

increased distortion can overshadow this advantage, however.)

A ported enclosure can also achieve good transient behavior but never

as good as an optimized sealed enclosure. It is possible, however, for

a well-designed ported enclosure to have better transient response

characteristics than sealed enclosures with higher Qtc's (above 1.0.)

The specific alignment of the sealed and ported enclosures plays a huge

role in determining the transient characteristics of each individual

subwoofer system.

Single-Reflex bandpass designs can also have good transient

characteristics if their bandwidth is fairly narrow, but again, not as

good as an optimized sealed enclosure. As the bandwidth becomes wider,

their transient response can degrade considerably.

Dual-Reflex designs generally exhibit inferior transient response

characteristics when compared to the other designs. As with

single-reflex designs, narrower bandwidths produce better transient

performance than wider ones.

distortion or transient response?

 

[audioholic 5,000+ posts]

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