rotarycolt

Wasn't slamming his gear, I was just simply stating a few things. People worship those subwoofers because of the way they are marketed, I just want people to know that they aren't all they're cracked up to be.

It's just that I didn't want him to think the subwoofer would produce any type of semi-accurate sound reproduction... Kicker's site lies about this, by saying it won its first ever SPL competition and first ever SQ competition with the sub... BUT if you read the fine lines, the SoloX was not used in the SQ portion, there were other subwoofers used for this. Very misleading.

Sorry if it sounded like I was slamming him.

rotarycolt

Not trying to start anything, but this is a misconception. You can use one amp to each coil without damaging it. The L7's are no different than any other multi voicecoil subwoofer.

Matching the gains on the 2 amplifiers with a multi-meter is suggested, as long as they are fairly close in output they will work fine.

Take a hop over to www.termpro.com to their forum if you want to learn more about this... most SPL competitors use multiple amps on theirs.

Later

KingLou

Might want to try understanding this yourself.......and take measures to avoid coming off as cocky.

And no sir.....you're mistaken.......I don't worship anyone here.......and I don't respect any cockiness. I've even jumped in on occasion to tone down a "friend".

KiL

rotarycolt

Wasn't just talking about you directly, just the forum in general. But, thats all forums.

Now that I cleared that up, this thread is back on track. Sorry about that.

usdmbB

I am not quite understanding what you mean buy this statement but sound deading comes in many forms and all the top SPL cars have some sort of sound deadening as panel movement can result in a loss of out put,or in most cases reinforcement which can be considered sound deadening i.e. concrete . I will back you up on the way to adjust multiple amps to a single woofer and yes people you can run multiple amps to a single or a dual or quad voice coil woofer. As far as everyone slamming each others gear just remember everyone has there own opinion PERIOD. As far as single woofer out put you can put just about any woofer in a box and do spl i have seen a single sony xplod15 doing 152 no problem. also there is a little honda cvcc that was running a single ten doing right at 170. There are a number of unknown woofers out there RE, Treo are some of my fav.,
we all just need to absorb what we read then make a post in return. This site is to be used to helpout fellow scion owners so lets not become what some people say other
car related sites are like. PEACE

KAuss

Yeah, I was thinking about the sound deadening as a must... I've seen concrete cars and they don't move LOL... If you dense up your car's panels, it'll create a tighter enclosure... But the actual physics behind it, I seriously don't have the knowledge to explain it heh..

As for the three amps into one sub, I don't know if it was a lie but I suspect they don't mind blowing a few woofers to squeeze a few extra watts into the woofer... I was just wondering if there is a way to do it safely...

usdmbB

It can be done for daily use but you would have to learn how to change adjustments
for max spl and daily use. Let me explain, first u can reach high spl # with a daily used system the best why is to use a high gain ported box that is tuned for around
70hrz or around 60hrz the reason for this is most cars will excite this range of bass
A little secret that will help also is using software that has tones not just music
it may not seem like a high number but in my xb with just a single sony xlpod ten
i can achive130's buy using test tones or a sweeping tone . Buy tuning the box
to a set freq. and testing it with a meter in the car you can find the range or freq.
that will work best for your needs. one way to do this is build a box set it in car
us a tone generator and a rta with spl meter find the freq. that has the most gain
and then build your box or system to peak at that freq.
this is the short version of how to due this .There are at least five guys on this site
that have done or still due compete . But in short it can be done safely .

KingLou

My take on sound deadening is (and this is just what I believe to be an educated guess)............rattling and flexing can produce sound waves that might interfere with what you're producing out of your sub. I don't know if this would actually cut down on your SPL.......but I don't see how it could hurt your SPL.......unless your car as it is without sound deadening material is perfectly shaped in such a way that any reflected sound waves are actually complementary.

KiL

DenZinz

What usdmbb is refering to is a transfer function map. if anyone wants to see it, I will post it on Crossfire Car Audio's site and give you the link. Its simple and will give you all the instructions on how to do it. You will need a SPL meter and a tone disc though.

The Transfer Function map is the best reference on what frequency you should tune your enclosure to. All cars have different acoustic properties and the transfer function map allows you to figure out your in-car freq. minus out of car frequency.

KAuss

Ahh, now a new question is... How do you "tune" an enclosure without expending a lot of wood doing trial and error? Each sub should have a different response to enclosure size, and port type, or whatever else anyone wants to build...

I'm a huge fan of slot port boxes, and the bigger the better... Tight bass might be what people want most of the time, but I want bass so shaky it'll be a massage every drive...

But how do you know what freq the box will excel at before building it?

As I live in San Francisco, we don't have wood shops avalible to us like those living in the country side :D I have almost no shop experience at all...

usdmbB

KAuss you can get a hold of autosound who's shop is now in Tracy510-750-7161 or my self at my new work in Santa Rosa, Cartronics 707-527-1515
DenZinz thank you for the help i was sleep typing last night.

DenZinz

Well it's the price to pay to be loud or clear. Transfer Function map will help you maximize what you have. Other than that you could build the enclosure to factory spec and you will be fine. It's only the tweeks that want to compete go the extra mile to get that few extra dB's or the desired freq. response they are looking for.

Depends on what your purpose of your system is for and to what extent.

KAuss

Yeah I have my S15L7 first generation sub fitted into a 4.7 cu ft factory spec slot ported box... Pounds even with a Rubicon 702...

I can't wait to see what a dual S15L7 setup would sound like, with a XTR Pro 2400... Thanks for all the help guys...

As for usdmbB, I'll give you a call when I actually save enough money to get my tC... It'll be at least a year tho but I won't be a stranger to the forum :D

My WRX was installed in Santa Rosa from another i-club member's shop... It was a great experience to get work done by fellow car ehthusists...