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Car Audio Question

Spineshank

Spineshank

Diamond Member
I have 2 Infinity Subs 4ohms that run 250RMS. I plan on buying a new amp sometime this month. Im looking at 2 both are Alpines, 1 is 400RMSx1 @ 2ohms and the other is 600RMSx1@ 2ohms. I will be running the subs @ 2ohms. Would it hurt the subs to buy the first amp? Assuming that im not having the amps gain turned up or my stereo so loud it hurts my ears. Or should I buy the 2nd amp?
 
Originally posted by: Marlin1975
First will be fine.

Not sure why people want to buy junk liek this but what ever floats your boat
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It's not the best stuff, but it's not exactly pyramid and lightning audio.
 
Originally posted by: glen
If at all possible, I would by an equalizer like the Audio Control EQTs.
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Im not too familiar with them...i know what they do but not sure what benefit i really get out of them or how to hook them up.
 
Originally posted by: glen
I am not sure there is going to be any real world difference between 400 watts and 600 watts.
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You make me laugh. 200 watts in a sub makes a lot of difference, it just depends on the RMS and how the speaker handles power above the RMS. What amps you lookin at, M1000/1 or M500/501/600? My M501s are workin just fine for the R1221s. You do not need the 600watt RMS amps though to run a 250 RMS sub.

But the thing you need to look at is the RMS the amps run at in 4 ohm, probably 200/300 watts. In this case, I would go with the second amp because the subs will be underpowered if you run the 400 RMS amp at 2 ohm will only run 200 RMS at 4 ohm.
 
Originally posted by: Soccerman06
Originally posted by: glen
I am not sure there is going to be any real world difference between 400 watts and 600 watts.
Click to expand...

You make me laugh. 200 watts in a sub makes a lot of difference, it just depends on the RMS and how the speaker handles power above the RMS. What amps you lookin at, M1000/1 or M500/501/600? My M501s are workin just fine for the R1221s. You do not need the 600watt RMS amps though to run a 250 RMS sub.

But the thing you need to look at is the RMS the amps run at in 4 ohm, probably 200/300 watts. In this case, I would go with the second amp because the subs will be underpowered if you run the 400 RMS amp at 2 ohm will only run 200 RMS at 4 ohm.
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In your opinion, what is the difference?

Also, remember that the difference between 1 watt and 200 is totally different than the difference between 400 and 600- you are going to have compression creep in and minimize differences, and a whole host of other problems, but I am sure you knew that already.
Can you explain it in terms of decibels at a certain frequency, or are you going to just tell me it slams harder, but you can't back it up or quantify it with real world data from calibrated measuring equipment?
 
Wire the subs in parallel to either AMP.

If you wire them in series they will sound very weedy. Simply becasue the load visible to the AMP would be 8 Ohms.
 
Originally posted by: Soccerman06
Originally posted by: glen
I am not sure there is going to be any real world difference between 400 watts and 600 watts.
Click to expand...

You make me laugh. 200 watts in a sub makes a lot of difference, it just depends on the RMS and how the speaker handles power above the RMS. What amps you lookin at, M1000/1 or M500/501/600? My M501s are workin just fine for the R1221s. You do not need the 600watt RMS amps though to run a 250 RMS sub.

But the thing you need to look at is the RMS the amps run at in 4 ohm, probably 200/300 watts. In this case, I would go with the second amp because the subs will be underpowered if you run the 400 RMS amp at 2 ohm will only run 200 RMS at 4 ohm.
Click to expand...


I question the knowledge of anyone who doesn't realize that two 4ohm speakers wired in parallel presents a 2ohm load. The amp will run at 2ohm, not 4.

 
Originally posted by: glen
Originally posted by: Soccerman06
Originally posted by: glen
I am not sure there is going to be any real world difference between 400 watts and 600 watts.
Click to expand...

You make me laugh. 200 watts in a sub makes a lot of difference, it just depends on the RMS and how the speaker handles power above the RMS. What amps you lookin at, M1000/1 or M500/501/600? My M501s are workin just fine for the R1221s. You do not need the 600watt RMS amps though to run a 250 RMS sub.

But the thing you need to look at is the RMS the amps run at in 4 ohm, probably 200/300 watts. In this case, I would go with the second amp because the subs will be underpowered if you run the 400 RMS amp at 2 ohm will only run 200 RMS at 4 ohm.
Click to expand...

In your opinion, what is the difference?
Can you explain it in terms of decibels at a certain frequency, or are you going to just tell me it slams harder, but you can't back it up or quantify it with real world data from calibrated measuring equipment?
Click to expand...

My ear smart ass. Yes its true that the amount of power to raise db is increased exponentially, but thats besides the point. You do know how math works right?

db = 10log P2/P1 where impedance are equal. So 80db require 100 watts 90db requires 1000 watts. Thats about 3-4 db with an extra 200 watts at RMS, now max power may be larger so you have to think about the, if the 400 RMS amp maxes out at 800watts, then it wont even get to 88 db. The 600 RMS amp on the other hand will get ~91db if it maxes out at 1200 watts.
 
Originally posted by: mrchan
Originally posted by: Soccerman06
Originally posted by: glen
I am not sure there is going to be any real world difference between 400 watts and 600 watts.
Click to expand...

You make me laugh. 200 watts in a sub makes a lot of difference, it just depends on the RMS and how the speaker handles power above the RMS. What amps you lookin at, M1000/1 or M500/501/600? My M501s are workin just fine for the R1221s. You do not need the 600watt RMS amps though to run a 250 RMS sub.

But the thing you need to look at is the RMS the amps run at in 4 ohm, probably 200/300 watts. In this case, I would go with the second amp because the subs will be underpowered if you run the 400 RMS amp at 2 ohm will only run 200 RMS at 4 ohm.
Click to expand...


I question the knowledge of anyone who doesn't realize that two 4ohm speakers wired in parallel presents a 2ohm load. The amp will run at 2ohm, not 4.
Click to expand...

Oops forgot he had 2 subs
 
Originally posted by: Soccerman06
My ear smart ass. Yes its true that the amount of power to raise db is increased exponentially, but thats besides the point. You do know how math works right?

db = 10log P2/P1 where impedance are equal. So 80db require 100 watts 90db requires 1000 watts. Thats about 3-4 db with an extra 200 watts at RMS, now max power may be larger so you have to think about the, if the 400 RMS amp maxes out at 800watts, then it wont even get to 88 db. The 600 RMS amp on the other hand will get ~92db if it maxes out at 1200 watts.
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Oh man, you are only usign a fraction of the math you need to get the real numbers.
But, maybe you know that - show me how smart you are and calculate the db difference at a certain frequecy between 400 watts and 600 watts. Include mechanical compression on the drivers at that db range (just estimate it) and then calculate for the change in electrical resistance, you can ignore the density of the air as it changes.
 
still doing the math?
tuck tail and run?
WTF, people are such smartasses on the NET, and so full of themselves, do they think they won't get called on the carpet?
If you don't know sh!t, why pretend to be an expert on the internet, someone there is going to know more than you.
 
Yes im running the subs in parallel so i would have them in 2ohms. But they are 4ohm subs.

Soccerman - Im looking at the M450 and the M650.

mrchan - You dont like alpine amps? What do you prefer.
 
Jesus another pissing match in OT 🙁


Oh BTW, you want a kickass amp go with Mephis they are bullet proof!


Ausm
 
get the less expensive one.

and to make up toe the loss of power, port the box, and you will get a louder system, than if you were to have just bought the 600W amp.

a properly ported box is good for 3db. you need to double power to get 3db.

you should be goood if you want loud with a ported box.

Glen, i dont think he would know how to setup an EQ, nor care enough.
 
It seems like everyone is getting ported boxes now. I like the sound of a sealed box myself. They produce a nice tight clean sound.

I have two Audiobahn 10" 4ohm DVC subs each in parallel for 2ohms load connected to a Rockford Fosgate amp using 200W x 2 @ 2ohm per channel. It sounds nice sitting in the open space in the back of my Z28.
 
i think we can all agree glen's audio-penis is about as big as an elephants...but when it comes to the layperson they frankly aren't going to care about the numbers to the 20th decimal point enough....just tell him a brand and a model #.
i setup 2 infinity perfect 12.1's in parallel on a JBL 600.1 in a bandpass enclosure (got it on ebay, added my own filler and caulk) and it sounded great. So long as your getting a mono amp or even an amp with a low-pass filter you shouldn't have to worry about an EQ (again for the avg person it wont matter). Alpine is good, JBL never dissapointed me, if you want higher end sub amps I've been playing with Orion amps lately and they seem to produce more power than what they are rated and sound nice.
 
I do need a box actually, had a crappy bandpass that i unloaded for $20. Was going to go sealed. Ill look into the ported ones though.

I could learn how to do the EQ not sure if i want to spend the money though.
 
Originally posted by: Gnrslash4life
I do need a box actually, had a crappy bandpass that i unloaded for $20. Was going to go sealed. Ill look into the ported ones though.

I could learn how to do the EQ not sure if i want to spend the money though.
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Band pass is another name for ported.
 
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