BOOT TIDY AMP

JohnnyN

As mentioned above, free air subs work differently to boxed/sealed subs. When you buy a sub they usually come with information or an instruction sheet about how they are meant to be housed. If your sub is meant to be in a box, it will need a specific amount of air volume. Subs can also be tuned to an optimum by using ported boxes whereby you use different length tubing for the port. It is quite a science getting a sub to work correctly giving a crisp punch when its needed.

:roll:

Matt

Guys !!! i was driving along today the my music blasting out and the bass kickin and then my bass cone started to make the noise of a wet fart !!!! cone blown i thought so my mate came round with a spare cone but this one says spx on it and is only 10". so i redesigned my boot !!

My question is this - is there alot in 10" and 12" as my old one was 12" and did sound more bass'r and this cone ive just fitted keeps peakin... if im lookin for a new cone im a best with a 10" or a 12" - my amp is 250W. alittle help on this one ?????

JohnnyN

Basically, if a sub is farting then its f*cked! You have to get the right combination between amp and sub. The RMS value is the wattage to look for, not total power.

Personally I've got 2x 12" JBL's in a double sealed box running from a Fusion 504e amplifier. It absolutely thumps like a bast!! I've had an 8" MTX in a ported box and that was great for the sharp punch. I've also had 1x 10" JBL ported. That was deeper more prolonged bass. I've had 1x 12" Kenwood ported. Deeper bass again. The best setup I've ever had is what i've got now and thats the 2x 12" JBL sealed.

I've got 2 kids, Lauren is 4 and Jack is 19 months and I can still happily get a pram in the boot if required without damaging my subs.

Go LARGE!!

Bandwidth 10Hz - 40kHz
Signal to Noise >95dB
Fuse Rating 2 x 25A
Separation >60dB
Input Sensitivity 300mV-8V
LP Variable Crossover 40 Hz - 160Hz @ 12 dB / octave
HP Variable Crossover 40 Hz - 600Hz @ 12 dB / octave
Variable Bass Boost 0 - + 18dB @ 45Hz
Variable Sub Sonic Filter 20 Hz - 55Hz @ 18dB / octave
Input Impedance 20K
Damping Factor >200
T.H.D 0.05%
Dimensions D 57.5mm L 330mm H 220mm
CEA 2006 Compliant Amplifier Ratings
12.6 Volt Power Output Specifications
50 WRMS per Channel @ 4 Ohms and 1% THD+N
75 WRMS per Channel @ 2 Ohms and 1% THD+N
150 WRMS Bridged Channels @ 4 Ohms and 1% THD+N

14.4 Volt Power Output Specifications
65 WRMS per Channel @ 4 Ohms and 1% THD+N
95 WRMS per Channel @ 2 Ohms and 1% THD+N
200 WRMS Bridged Channels @ 4 Ohms and 1% THD+N

cheers..

Matt

SPLX are a CHEAP make of sub, and won't last very long. Also, you've still not answered the question as to whether you are running the sub in a sealed box, or just sat behind the MDF. You'll have blown the sub because it still looks like you are running it free air, when it should be sealed.

10" - Nice and Punchy, doesn't drop very low (Dance music)
12" - Comprimise between a 10" and a 15" drops quite low, but still quite punchy
15" - drops low for good base (D&B, R&B etc)

Matt

As a quick size reference, this is my 15" JBL GT4 in a custom built box designed specifically to the required internal volume recommended by the manufacturer.

As you can see, that takes up a 1/4 of the boot on an Astra, so I'm guessing you'll be running yours free air just sat behind the MDF

Matt

well i listen to alot of rock and ballads and stuff - some chill out - dont listen to rap or r&B so is a 10" a better option - tomorrow im gonna build an encloser around the sub - and buy a new sub - any reccommendations - i quite like the sony explod stuff ????

Matt

You need to know the specific recommended internal volume for the sub to work to it's optimum. It might be worth buying a sub and box combination, as if you get the volume wrong, it will sound shite.

JohnnyN

I appologies in advance for any offence but Sony is sh1t!

JBL, Kenwood, MTX or Alpine are the makes to go for. Also Vibe and JL Audio are very good but very expensive. Its upto you but if you buy Sony you'll regret it.

That is my opinion after running a number of different subs and box combinations for 15 years.

Matt

well this is why im here lads - your advice - thanks alot for everything

Matt

what about boss ?

JohnnyN

How much have you got to spend? That'll give an indication of what choice you have.

dunno..

Matt

Ashley 2.2 said:
what about boss ?

Boss is cheap and shitty as well, Boss and SPLx are basically the same make.

Give us a rough idea, and I'm sure between us we can make a few suggestions.

As John has said, Sony is crap as well. I've had a Sony headunit for the past 3 years, and I hate it! The standard vauxhall one sounds a lot better, but the only reason I have it is because it plays MP3's. I can't wait to upgrade next month.

Andy

JohnnyN said:
I appologies in advance for any offence but Sony is sh1t!

JBL, Kenwood, MTX or Alpine are the makes to go for. Also Vibe and JL Audio are very good but very expensive. Its upto you but if you buy Sony you'll regret it.

That is my opinion after running a number of different subs and box combinations for 15 years.

have to say John i wouldn't recommend MTX stuff to anyone. I have 3 MTX amps (1 fooked at the mo) and 2 12" MTX thunder subs and i've had nothing but trouble.

the amp that powers the subs had to be replaced after 1 month cos it kept blowing fuses and then just before xmas the same amp has fooked up again leaving it unrepairable. also have had to replace 1 sub after 14 months cos that gave up the ghost.

all products where bought brand new and professionaly installed and setup.

the funny thing is i bought 2 12" sony xplod subs about 5 years ago and then sold them to a friend when i bought the MTX stuff. these subs are still going strong now.

JohnnyN

The last MTX sub/box combination I had was about 9 years ago. After reading of your problems it looks like the level of quality has dropped.

:oops:

Andy

maybe was just my bad luck but i'd never buy mtx again. bought mtx as it came highly recommended,

JohnnyN

Something else to watch out for!!

Over the years I have noticed that people spend loads a money on top spec cabling. This is fine, but what always amazes me is when you buy a sub/box combo, the cables within the box from the back of the sub is absolute crap and only good for wiring up your doorbell.

If you buy a sub/box combo, remove the sub after purchase and get some high end cables fitted.

showo..

Matt

JohnnyN said:

If you buy a sub/box combo, remove the sub after purchase and get some high end cables fitted.
showo..

Totally agree.

Matt

right guys ive managed to seal it off round the back and also lilned it with nice sub carpet so its air tight ish...... sounds alot better but the speaker is maxin out - ive bought a new kenwood kfc range sub - will that sound better....

JohnnyN

When you say 'Maxing out', how do you mean?

notsure.gif

Matt

when turned up goes distorted

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