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View Full Version : wat is xmax? HELP BADLY



spacegear
12-29-2006, 08:43 AM
i dunno wer x max comes from. heres wat comes with my woofer manual.
max power : 400 watts
freq. response : 30 hz - 5 hz
sensitivity : 90 dB @1w1m

suggested box parameters.
system type : 2nd order closed box
v(B) = 1 cu. ft.
Q(tc) = 1.003
F(sc) = 68.41 Hz
alpha = 4.2

what does those numbers mean. HELP!

iamamp3pimp
12-29-2006, 08:55 AM
v(B) = 1 cu. ft.
meand that the recommended box for this sub is 1 cubic foot.


google search T/S parameters for the rest

PV Audio
12-29-2006, 01:05 PM
i dunno wer x max comes from. heres wat comes with my woofer manual.
max power : 400 watts
freq. response : 30 hz - 5 hz
sensitivity : 90 dB @1w1m

suggested box parameters.
system type : 2nd order closed box
v(B) = 1 cu. ft.
Q(tc) = 1.003
F(sc) = 68.41 Hz
alpha = 4.2

what does those numbers mean. HELP!
Max power = the maximum amount of power the woofer can take

Freq res. - the range in which the speaker plays, but that range is next to impossible, so please post what the speaker is

Sensitivity - How efficient the speaker is aka how little power it needs to get to said volume level. In this case, it takes 1 watt from one meter away to register 90 decibels. The higher does not mean the better, it's only helpful when matching with an amp and an enclosure.

Vb = Net volume the speaker wants, thus, after everything else is accounted for, the amount of airspace left over.

Qtc = Box "q" factor. Usually only used in sealed boxes, it's the total Q of the system at the resonant frequency

Fsc = I have no idea in hell, maybe the rolloff?

Alpha = Again, no fukin clue.

And xmax is merely the amount of LINEAR movement the speaker can make per stroke (one-way). Measured in milimeters, Xmech is how far the speaker can travel when only limited by the suspension components (this is usually NOT linear). Linear travel means that you're most likely not encountering distortion yet, whereas if you're reaching Xmech, you're most likely either overpowering the speaker, or have it in too large of an enclosure (ported most often).

helotaxi
12-30-2006, 11:31 AM
Fsc is the resonant freq of the sub in the box listed.

For the Freq Response there is a "k" missing in front of the second "Hz."

Platestacker45
12-30-2006, 11:45 AM
i dunno wer x max comes from. heres wat comes with my woofer manual.
max power : 400 watts
freq. response : 30 hz - 5 hz
sensitivity : 90 dB @1w1m

suggested box parameters.
system type : 2nd order closed box
v(B) = 1 cu. ft.
Q(tc) = 1.003
F(sc) = 68.41 Hz
alpha = 4.2

what does those numbers mean. HELP!
And please stop talking like a baby....

angrytrucker78
12-30-2006, 12:02 PM
And please stop talking like a baby....

I don't believe English is his first language. Looks like he's from the Phillipenes(sp?)

helotaxi
12-30-2006, 12:42 PM
He's knows enough English to type like a net dork...

PV Audio
12-30-2006, 01:34 PM
And please stop talking like a baby....
Stupid '06s. He was just asking what the parameters meant. :rolleyes:

acold7dusta
12-30-2006, 01:40 PM
And please stop talking like a baby....

call me blind, but i read it over and over, and didnt see him talking like a baby?

PV Audio
12-30-2006, 03:21 PM
Exactly what I was saying.

Platestacker45
12-31-2006, 08:40 PM
Let me highlight what I meant, for all you slow folks out there:
i dunno wer x max comes from. heres wat comes with my woofer manual.

ravendarat
12-31-2006, 08:41 PM
Isnt Xmax where the big fat guy in the red suits comes down your chimney and leaves presents a **** behind?

PV Audio
12-31-2006, 08:44 PM
Let me highlight what I meant, for all you slow folks out there:
i dunno wer x max comes from. heres wat comes with my woofer manual.
:rolleyes: This is a forum, look around you. That's good grammar for this place.

Davie06tC
12-31-2006, 08:46 PM
So it upset you enough you needed to post about it? Sounds like you are the baby to me sir :D

Platestacker45
12-31-2006, 08:50 PM
So it upset you enough you needed to post about it? Sounds like you are the baby to me sir :D
Isen't that what your supposed to do in a forum?!?!? Post things?? Sir? :laugh:

spacegear
01-01-2007, 02:03 AM
thanks for the input guys. theyre really helpful. You're al; right. im fromm the philippines. at least i know how to speak english. im only 16 yrs old new to auto sound. pls bear with me. :p

Hintzyboy
01-01-2007, 03:02 AM
Isen't that what your supposed to do in a forum?!?!? Post things?? Sir? :laugh:

Please tell me that this^^^^^ was error for emphasis. Give the guy a break. How many different languages can you speak (or type) PERFECTLY. Sometimes things just get lost in translation.

Platestacker45
01-01-2007, 05:55 PM
Diden't realize that English was not his first language. Just used to punk kids and dumbazzes posting stupid nonsence and taking up forum bandwith. My appollogies.

mtlhead
01-01-2007, 06:05 PM
Diden't realize that English was not his first language. Just used to punk kids and dumbazzes posting stupid nonsence and taking up forum bandwith. My appollogies.

Couldn't help it :D

savagebee
01-02-2007, 07:12 AM
Diden't realize that English was not his first language. Just used to punk kids and dumbazzes posting stupid nonsence and taking up forum bandwith. My appollogies.

you missed one:) :laugh: