I was just wondering if going with two subs instead of one is going to just result in more db. I recently decided to see if there is a difference between one sub and two subs because i would like to have the extra money from selling the sub, less weight and more room.

I took out one of my subs and i have only noticed a slight drop in loudness. Is this the only thing i should expect to notice? I was just wondering because its the only thing i noticed and for some reason my friend thinks that there is a sound quality difference between one sub and two.

Also i think that their is some air escaping from the eclosure next to the single sub, would this result in a noticable eclosure volume loss if i can fell the air more across my hand when put in the empty enlcosure?

Anyone know how much rms a 120.3 can handle over the 300rms before damage? Just incase i want some more db.


Also for you people wondering my setup:

2 Infinity 12" 120.3DVC
1 jbl 600.1 amp wired for 600rms @ 1 ohm
and a r/t 321-12 sealed sub box

The box and sub will be up forsale if i get a good offer once the results are in and if i get a good offer.

 

the diff between 2 to 1 sub is about 2- 3 db's , not much , that's why you dont hear a difference in the overall bass it provides for you. i cant answer your ? about the infinity because i'm not familiar with the infinity subs ( i'm a polk/momo kinda guy) but in general it depends on each sub on how much more power it can take rms before it starts sounding distorted. i know infinity is a kick@$$ namebrand and very reliable, but i wouldnt put any more power to it than the peak power, cause then you'll be saying "awwwwwww man, infinty - you gotta be kiddin me! " then it'd be time to look for new subs! good luck on this !

 

The diffrence is , scientifically, twice the bass.

The JBL 600.1 works at 1 ohm, but isnt incredibly reliable at 1 ohm. I ran mine at 1 and it would cut out sometimes.

 

dumb question:

I have an old MTX amp 600w X 1 or 200w X 2 @ 4ohm. I want to run 1 sub to save trunk space but is there a way to de-tune the amp? Subs that can hold 600w+ RMS is expensive

@ 2ohms, it's 750w X 1 or 300w X 2. How do you tell if I'm running 2 or 4 ohms?

 

just lower the gains. the amp doesnt pick what ohm its run at, the sub does. if you have a svc4 sub it will be 4 ohms, dvc4 its 2 ohms or 8 ohms. dvc2 its 1 or 4 ohms. this is with one sub only.

 

depends on how your subs are wired up. what kind of subs are you running? dual voice coils or single? how many ohms?

 

ive been running at 1 ohm because its my only option other than 4ohm and @ 4 im only putting out 300 i think... Ive been running @ 1ohm for over a yr and no problems yet. I think in the manual it says stable at 1ohm but doesnt increase in power compared to 2ohm. Looking around i am thinking about building a box with an internal volume of 1.25ft^3, Infinity recommends 1ft^3. Anyone see any negative effects accpect for effects in the higher bass frequencies. Also should i include the volume of the driver.

I was think of build the box the following dimensions(outside)
width 15.25" Height 14" Depth 14 " thickness .75 = 1.243ft^3

Are internal Braces Truely necessary, or only something for a piece of mind.

 

nope. perfect setup for ya. the jbl should be fine...my roomate has run it at 1 ohm for about 6 months with no problem in the FL heat.

 

^^

you don't need any bracing for a box that 'small'. my 2.5 cu box doesn't have any bracing and it's fine.

 

thats cuz your amp is soft.

 

quiet you, at least i got bass at the moment

 

so the sub is the one that determine the ohms? what about a 3ohm sub, could that be ran on a 2 ohm amp?

btw i got my hu back from alpine today!

 

if it's just svc 3 ohms, then the amp will see 3 ohms, not 2.

 

so would the amp give it 2ohms 4ohms or 1 ohm? i mean could it give 3?

 

yes the amp will. but all depends on the type of power supply. like a jbl 600.1 puts out 300 watts at 4 ohms and 600 at 2. so at 3 ohms...450 maybe? hows the sound now with the h/u?

 

putting it in first thing tommrow, just runing my 4awg wire and stinger rcas

 

Ok so even w/ a 600w amp, I can safely run 400w sub as long as I lower the gain?



I'm not sure if my subs are dual or single coil. They are reg polks which I had them for 5-6 years. I've only used them for about a year.

Can you explain what you mean by "how subs are wired up"

 

as long as the voice coil can take the heat and abuse of more power, and the subs suspension wont go too far past xmax you're fine. but if you keep the gains real low the sub wont see 600 watts anyway.

 

well subs can be wired in various ways and each method will affect the load the amp will see. this link might help explain what i mean

 

That explains alot. Is there a way to check if my subs have single or dual voice coil?

Nevermind. I think I figured it out.

 

yeah, dvc subs will have two sets of terminals, usually on opposite sides of the basket.

 

A while back I went from using two 10" Polk EX subs in seperate enclosers to one 12" Infinity Perfect DVC sub. I used the same amp and wired the DVC sub to 8-ohms and the difference was amazing. The Perfect kicked the crap out of the 2 EX's. This leads me to believe that your sound output and quality is much more directly related to the quality of your sub(s).
Your situation is a little different, though, since you're just removing 1 sub. As stated already, your volume may go down a little, but not much. Lower the gain on our amp, and or wire it to a higher ohm rating and you'll be fine.