could be a silly question here...
If i'm putting 1x 150W rms to a JBL sub and it sounds ok,
if i them put say 1x250W rms to it, would it sound better, deeper, louder or really no difference?
the reason why i ask is that i'm running an alpine 4 channel amp (thinks it's 4 x 75W), and have bridge 2 channels to run the sub, but i think it could handle more or sound better.. what is your thoughts????

Im pretty sure you can only bridge 2 channels together mate, so the max power your going to get is 150rms, grab another sub then you can run the other 2 channels into the new subby and have 300rms?

that i already know... i was thinking of getting a new amp with a higher power rating, not
briging all four channels :D
thinking of getting a high output 2 channel amp and briding that to give a high single output, anthing higher than say 250W rms..

well yeah man that would work, just remember the max rms of your sub
cheaper option would be to just grab another sub and run it off the other 2 channels, 300rms with a good box is more than enough bass

Your Best off getting another Sub..
It all depends on what you want to achieve /
Louder, Deeper or Quality??

One High Powered sub should play louder but pushing it at its limits can lead to trouble..
If you want louder and safer look at Two Subs ,for deeper get a Larger enclosure for your Curent one..

I have often found that a Dual Sub setup often sounds better then a Single one....
How ever I have heard some Damn good single sub setups but they have to be tuned properly..

go more power if your sub can handle


momo block

go more power if your sub can handle

momo block

Momo block :bowrofl: Do Polk / momo make amps?

I think 1 sub is better and cheaper in the long run.

1x $600 sub will usually outperform 2x $300 sub. The enclosure will be cheaper, the sub will more than likely sound better, the 3db added by having 2 subs will be more than made up with the single sub recieving the same power as the 2 subs ( even if they have a lower RMS rating ), $600 sub will have more excusion and more control over the lower notes at higher volume. More power is usually the answer.

Think of it this way, would you buy 2x DD2012's when you can get a DD3512 or would you buy 2x 3512's when you could get a DD9512?

What subs are we dealing with Here ??
We have the Alpine 4 Channel Amp, but what sub have you got at the moment ??
If it is a JBL GTO or what ??

thanks for that guys...
the sub is getting a tad old... it's a JBL GT 1000 (i think, it's been a long time since i put it in the box!!)
(i don't have enough room for another sub, the boot is has to stay available for the baby's pram!!!!!) ahahhahaha!!!!

Theoretically 2 subs each receiving 250 watts will give a 3db increase over 1 sub receiving 500 Watts. (providing they can handle that power and all other things equal.) the increase in surface area causes this.

But there is no point in having heaps of bass if you don't have the midbass and front stage to keep up.

Bass will just drown everything else out.

peace

Tim

opps sorry mono block

Theoretically 2 subs each receiving 250 watts will give a 3db increase over 1 sub receiving 500 Watts. (providing they can handle that power and all other things equal.) the increase in surface area causes this.

But there is no point in having heaps of bass if you don't have the midbass and front stage to keep up.

Bass will just drown everything else out.

peace

Tim

Theory is a wonderful thing, how easy would our lives be if everything just worked. Just a question though, shouldn't the 2 subs be rated at 250WRMS and the single at 500WRMS but say both required the same size sealed box and effiency etc was the same, is that right? I was always taught that it is better to run 1 sub at full potential than 2 of the same at half potential ( i.e half power ).

Easiest way to add db is through box design, ported and bandbass add those db but then lose out on SQ, nature never gives anything for free. What fronts are you running dude?

opps sorry mono block

:bowrofl: classic. But does anyone know if momo / polk make amps?

Just a question though, shouldn't the 2 subs be rated at 250WRMS and the single at 500WRMS but say both required the same size sealed box and effiency etc was the same, is that right? I was always taught that it is better to run 1 sub at full potential than 2 of the same at half potential ( i.e half power ).

Easiest way to add db is through box design, ported and bandbass add those db but then lose out on SQ, nature never gives anything for free. What fronts are you running dude?
What the subs are rated at is irrelevent. This is just how much power they can handle. On the other hand sensitivity is of great value in figuring out how 'loud' they will go. The more sensitive sub will give more SPL with lower power.

If you have 2 identical subs. In identical boxes. Running one with 500 w rms, will give 3 db less than running two with 250w each. This doesnt take into account cabin gain which will reduce with a second box taking up the space etc. many other considerations, this is the general rule though.

Doubling the surface area = 3db gain.

I'm running Morel Hybrids front stage with additional ambient tweeters. All running active and powered off Soundstream Picasso's. Door are also sealed (as best I can) and deadened over the inside, outside and trim.

Peace

Tim

What the subs are rated at is irrelevent. This is just how much power they can handle. On the other hand sensitivity is of great value in figuring out how 'loud' they will go. The more sensitive sub will give more SPL with lower power.

If you have 2 identical subs. In identical boxes. Running one with 500 w rms, will give 3 db less than running two with 250w each. This doesnt take into account cabin gain which will reduce with a second box taking up the space etc. many other considerations, this is the general rule though.

Doubling the surface area = 3db gain.

I'm running Morel Hybrids front stage with additional ambient tweeters. All running active and powered off Soundstream Picasso's. Door are also sealed (as best I can) and deadened over the inside, outside and trim.

Peace

Tim

Bahahaha not you tim, i know what you are packing :bowrofl:

You can never beat a 6th order bandbass box for added gains with the same power :badgrin: Hmmm my boston 12.5 has a sensitivty of 97+.. is that good :bowrofl: That is why it is so god dam noisy.

Im pretty sure you can only bridge 2 channels together mate, so the max power your going to get is 150rms, grab another sub then you can run the other 2 channels into the new subby and have 300rms?

Hey this is not the case if you have a dual voice coil sub, cos you can run more than one amp to a sub, I know cos i've done it.
The Only problem with this is the tuning, you have to be spot on or you will blow your sub in about a week.

I would not recomend doing this unless you have some know how, i spoke to the audio guys at Audiocom in Joondalup, and they said that i was the only person they new of running this set up without blowing my sub the next week.
Do tune your amps you need a lot of time and a voltermeter, you have to match the output voltage of each amp to each other. They voltage reading need to be very close together that way your sub (and amps for that matter) will be ok.

The reason you would do this you ask......money, i didn't have much so i couldn't afford a sweet amp at the time do i bought a cheaper one and bridged them. The amps i used was Pioneer 300 two channels, so when i bridged the two i had 300RMS into my Kicker 12 CVR.

If anyone is intrested in doing this i'll be happy to explain more, and if you life in Perth i could help you tune it if you wanted.

Yes this can definetly be done. Varying the volume levels of the channels wont matter too much, just results in reduced output or earlier clipping. If they arent exact one coil will just move further than the other coil. Of course still best to get this right, but it wont damage the sub.

The danger is driving mixed signals into different coils. You need to run both channels in mono or mixed mono. And ensure you are not driving separate stereo signals through different coils. a\Although most sub signals are mono anyway, if these are different the coils will not be moving with each other. And will most likely destroy ur sub as has been said.

Power isn't much use if it cannot be used Properly..

It is true, Proper Tuning of an enclosure can gain extra db, But having Two Subs Tuned Properly will net Better results then one..

Besides, One 500W sub wont move as Much Air as Two Subs With only half the power..
Cone Space as well as Tuning and power all play there Part..

It is Much safer to run Two Subs at less then their full potential then running one Sub at its Maximum..

[QUOTE=magnat]Power isn't much use if it cannot be used Properly..
QUOTE]

Defently true, you can have heaps of power but you still need a good sub, and not one of those cheap ones ($99 special) although if your just starting out, they are fine. Again everything comes down to dollars

Power isn't much use if it cannot be used Properly..

It is true, Proper Tuning of an enclosure can gain extra db, But having Two Subs Tuned Properly will net Better results then one..

Besides, One 500W sub wont move as Much Air as Two Subs With only half the power..
Cone Space as well as Tuning and power all play there Part..

It is Much safer to run Two Subs at less then their full potential then running one Sub at its Maximum..
plus it looks cooler lol

:bowrofl: classic. But does anyone know if momo / polk make amps?
I think I remember seeing them in a Magazine.....so yeah, i think so! :confused:

I think I remember seeing them in a Magazine.....so yeah, i think so! :confused:

Yeah i think they do cause remember the ad with a Prelude near a pub or something on the corner and he had blah blah splits / subs and guess it mentioned amps, couldnt be bothered looking threw over 3000 pages of Hot4s to find it. :doubt:

couldnt be bothered looking threw over 3000 pages of Hot4s to find it. :doubt:
Exactly. I remember the subs with the white cones, I am almost sure there was an amp there somewhere to go with them....

Probably internals of some other amp (Alpine?) with a Polk/Momo label :bowrofl:

Exactly. I remember the subs with the white cones, I am almost sure there was an amp there somewhere to go with them....

Probably internals of some other amp (Alpine?) with a Polk/Momo label :bowrofl:

Word :bowrofl: :bowrofl: Maybe boss lent them a hand?? They are silver. :think:

someone go to the polk site and find out!

someone go to the polk site and find out!

Dam you... yes they do. A mono block, 4 ch and 2 ch all US$449. :shock:

SCORE!


muhahahahahahahah! I knew I saw it! :bowrofl: