for the experts

[swaptrex 10+ year member]

for the experts your gonna laugh but i have a few simple q's: i don't understand box tuning such as a box tuned to 30 hz or something like that, i also don't understand ohms like if i got a dual 2 ohm xxx what ohm output do i need from the amp i purchase, and also when u guys talk about component sets that come w/ crossovers, tweets, and comps do the tweeters take as many watts as the comps do? like for example if i had a 85x4 rms amp would the tweeters take up two of those channels? thanks in advance for help.

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[JimJ 5,000+ posts]

http://www.bcae1.com

I believe that's the correct url...

 

[swaptrex 10+ year member]

ehhh, that doesn't really help //content.invisioncic.com/y282845/emoticons/crying.gif.ec0ebefe590df0251476573bc49e46d8.gif

 

[johnecon2001 5,000+ posts]

I'm not very smart when it comes to box calculations and tuning (takes me about an hour to calculate volume and dimensions) so i'm not gonna answer that one.

As for wiring the woofer. My goal in everything I wire is to keep it at 4 ohms. You can wire your sub in two different way, Parallell and Series. Series doubles the ohm load and parallell cuts in half (actually its different than that, but in your case thats the easiest way to explain it). Your sub can run at either 1 ohm (parallell), or at 4 ohms (series). I would suggest getting an amp that puts out what RMS (average music power - root means square) at 4 ohms. Then wire your sub in series to get that load.

For comps. One set of componenents generally includes one tweeter and one midrange driver (two-way set). Three-way sets include one tweeter, one midrange driver and one low-midrange driver. The manufacturer builds the crossover to split the power IN to the right amount for each driver. So if the entire set takes and RMS of 85, the crossover will deliver the right amounts of power to each end of the set. So if you have a full set of comps (one for each door... two-way system) they will only take up two channels on the amp, because the crossover preforms the split later on down the line.

holla back if that helps.

 

[swaptrex 10+ year member]

thanks alot man appreciate the help!

 

[BASS OUTLAW 10+ year member]

for the experts your gonna laugh but i have a few simple q's: i don't understand box tuning such as a box tuned to 30 hz or something like that,

well i still didnt get ur question.

do u mean how to calculate it, or u mean what does it exactly help for ?

vented/ported enclosure tunned @ 30hz, will peak @ 30hz and tunned to 29hz will peak @ 27hz, and so on.... (but still inside the car might peak @ higher than the original tunning, because of ur car resonant ferq)

generally ported tunned to higher than 30hz will be more SPL oriented.

30hz and lower SQ) lower tunning wont be that loud, but will give more detailed bass. (high excursion subs (high Xmax) are always recomended to be in sealed) and vice versa..

i can still be wrong, some1 correct me, or edit my post , feel free //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[jellyfish420 10+ year member]

As for wiring the woofer. My goal in everything I wire is to keep it at 4 ohms. You can wire your sub in two different way, Parallell and Series. Series doubles the ohm load and parallell cuts in half (actually its different than that, but in your case thats the easiest way to explain it). Your sub can run at either 1 ohm (parallell), or at 4 ohms (series). I would suggest getting an amp that puts out what RMS (average music power - root means square) at 4 ohms. Then wire your sub in series to get that load.

i would suggest to get an amp to put out power @ 1ohm, it will be cheaper...

example...my amp puts out a mono(single channel)350w@4ohm,700w@2ohm, and 1400w@1ohm...

 

[jellyfish420 10+ year member]

?
vented/ported enclosure tunned @ 30hz, will peak @ 30hz and tunned to 29hz will peak @ 27hz, and so on.... (but still inside the car might peak @ higher than the original tunning, because of ur car resonant ferq)

generally ported tunned to higher than 30hz will be more SPL oriented.

30hz and lower SQ) lower tunning wont be that loud, but will give more detailed bass. (high excursion subs (high Xmax) are always recomended to be in sealed) and vice versa..

i can still be wrong, some1 correct me, or edit my post , feel free //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

ok i'm gonna correct you...a 30Hz enclosure will peak around 40Hz. a ported enclosure will generally peak around 10Hz higher than tuning. normally higer than 40 is spl, between 30 and 40 is sql, and below 30 is sq. a small sealed will normally take more power than ported, but ported will take more power @ tuning. but below tuning you may damage the woofer, due to loss of cone control. and high xmax in sealed and vice versa...who said that????

 

[johnecon2001 5,000+ posts]

i would suggest to get an amp to put out power @ 1ohm, it will be cheaper...example...my amp puts out a mono(single channel)350w@4ohm,700w@2ohm, and 1400w@1ohm...

what he said is true, one ohm would be cheaper. I just like four ohms because it helps keep equipment alive longer.. those are the trade offs you gotta think about when you're buying gear.

 

[squeak9798 5,000+ posts]

For comps. One set of componenents generally includes one tweeter and one midrange driver (two-way set). Three-way sets include one tweeter, one midrange driver and one low-midrange driver. The manufacturer builds the crossover to split the power IN to the right amount for each driver. So if the entire set takes and RMS of 85, the crossover will deliver the right amounts of power to each end of the set. So if you have a full set of comps (one for each door... two-way system) they will only take up two channels on the amp, because the crossover preforms the split later on down the line.

The crossover doesn't split the power, it splits the frequencies. If you send 85w to each side, and both the mid and tweeter are 4ohm, then they both will receive 85w. But the tweeter will only receive frequencies above, say, 3500hz for example, and the mid will only receive frequencies below 3500hz (again, for example purposes only, the "crossover points" will vary from component set to component set). But speaker manufacturers aren't stupid, they won't rate the comp set (power wise) for something that both speakers (the mid and tweeter) can not handle. So don't worry too much about what each speaker can handle, pay attention to 1) what the manufacturer recommends and 2) installation conditions.

Oh, and the reason why those 4 speakers only need 2 channels is because of the crossover. One midwoofer and one tweeter get wired to one crossover. That crossover is then wired to one channel on the amp. So one channel goes to one crossover, which then sends the signal to one mid and one tweeter. That happens for both the left and the right sides

 

[squeak9798 5,000+ posts]

(high excursion subs (high Xmax) are always recomended to be in sealed) and vice versa..

That is wrong. The sub's overall design determines what type of box is most appropriate, not the excursion.

 

[jellyfish420 10+ year member]

That is wrong. The sub's overall design determines what type of box is most appropriate, not the excursion.

thats what i though...i've never heard that one before.

 

[swimfreak26 10+ year member]

My goal in everything I wire is to keep it at 4 ohms

Why?

Power at lower ohm loads is cheaper and not audibly differnt to the human ear.