is it possible/advisable to put components in the front and 3 ways in the rear? or should i just go with 3 ways all around, ive seen some infitys that i like that just went on sale in crutchfield for only like $70 a pair, so im thinking about getting those with some kind of amp. suggestions?

 

Components up front, and either a) nothing in the rear, or b)stock stuff in the rear.

 

+1 to the se r freak.

 

why wouldnt i want to put anything in the back?? and i cant put stock in the rear if i replace the front speakers because i have bose.

 

You won't need to have anything but whats stock back there.

 

Why WOULD you want something in the rear?





Who told you this very much wrong information?

 

if i take out the soch adapter i currently have on my pioneer HU then i will blow the back speakers.. correct? also i still dont have a clear answer as to why there is no reason to put speakers in the back it seems like common sense that more speakers + more power = better sound/more sound

 

Not correct.

Last time you went to a concert where did the music come from? Behind you?

More speakers + more power doesnt always equal louder. Definately does not equal better sound. Im sorry sir, but your logic is slightly flawed.

 

okay so i understand about the speakers and concert and all, but how about the rear speakers? disconnect them or just leave them? should i put in an amp for the components

 

Thats entirely up to you. There is no 'right or wrong' about rears, its all opinion really.

Yes any comps should be amplified.

 

Do the components up front and 3-ways in the rear. If you like, you can always fade out the rears to get more front "soundstage", but whatever.

Technically speaking, running rears will generate more volume...duh more speakers with their own power source (either rear amp out from HU or their own channels from an amp) will ALWAYS be louder than without. I agree, sound from the rear of the car may diminish overall SQ, but overall SPL will go up. Since a car is a crappy place for SQ, I prefer crushing SPL with passable SQ.

Run rears and turn em down if it makes you feel better

 

Im sorry, but Ill have to disagree there. More speakers does Not make it louder. Im unsure of where your sourcing this from, but its just plain not true.

 

From what Pearl96 is saying, I think... Is by adding back speakers when you didnt have any isnt essentially increasing the volume (loudness) but instead is giving you more sound because if you didnt have speakers coming from that area in the first place and now you do you have added sound, not volume loudness. So lets say the volume is turned to level 12 or to a certain point on your HU and you have just the front speakers. Once you connect the rears up you have then added sound at the same level of volume the HU was set at. I guess this gives the feeling of added volume but it is instead added sound.

 

And 6.5's will hardly add spl, they make it seem louder though. If you want SPL you add subs/amps and do proper work for spl gains. SQ is diminished a great deal with rear speakers if they are not turned down low enough.

The most I would do for rear speakers is either run midbass's or sub's IB and not use a box in the trunk at all.

 

I will definitely agree that rear speakers will disrupt your front soundstage IF there is no specific sound processing used for rear (like in car surround sound as some high end automakers employ). Most rear speaker setups are just an extension of the basic L/R Stereo signal, and yeah that'll muddy up your front L/R seperation since there is less distinctly seperated sereo sound from the rear.

HOWEVER, no way can I agree that more speakers does not add more volume. Neither does "more sound" not equate to more volume, WTH?

Basic theory behind measuring perception of sound:
For something to sound, or be percieved as TWICE as loud, you need to add +6db.
To gain +6db requires a ten fold (X10) increase in power. So, 1 watt into a basic speaker might yield 90db, 10 watts sounds twice as loud at 96db, 100 watts is another "doubling" of volume at 102db (per individual speaker, mind you) and so on.

Adding 1 additional exact same speaker with same power levels yields a +3db increase in volume, but 3db is not usually felt as being much louder to human ears.

In the case of a car with 4 same style speakers each getting 50 watts, there will be a very noticeable difference in volume if you turn off/on the rear speakers because at any given time a pair of rear speakers at same power levels are adding +6db (roughly twice volume) EXCEPT for the obvious fact that the rear speakers don't face you directly and the interior of the car eats up some output so it isn't truly =6db at your ears, but anyway it definitely IS an increase in sound levels.

How could you add two more drivers into a sound system with effectively double power input into the system and NOT have some increase in volume?

Another way to look at it, running a pair of speakers at 10w RMS each is not as loud as running 4 speakers at 10w RMS each.

Anyways, I'll agree that rear speakers can muddy up your soundstage, but so does droning road noise. I'll gladly take a nice set of rear speakers ANY day and reserve the option to "turn them off" if I want a better front soundstage.
But while I am cruising a nice summer day with the windows open, I'd prefer double the speakers and power.

 

IF you want LOW FREQUENCY SPL 6.5's won't add to that kind of SPL. SPL can be measured at any given frequency. I think alot of people associate or assume that SPL only refers to low end bass because that is what most people focus on. SPL is generated at any given frequency and you can measure at any frequency desired. I am sure rear 6.5's will add more SPL's in the 250hz-10Khz-ish range.

 

You left out details of the drivers at question. Efficiency will play a huge role in any situation. Also 3db is generally accpeted as 'double the sound'.

Lets also be fair here, your arguement is that 50 X 4 speakers would be louder than 50 X 2 speakers, well hell thats a no brainer. But does it extend to 100 X 2 Vs 50 X 4? Lets keep things equal now. Your doubling drivers, thus doubling power. Not a fair argument. Keep power supplies equal and then attempt this test again.

Also bearing in mind whats *perceived* as 'louder' isnt always actually louder. Your car for example uses the rear parcel shelf for the rear drivers, thus raising them to ear level, so while less power than the front will get them heard, they are Not actually performing any louder.

 

(rear speakers loose volume to the front listeners, I KNOW! but the still add more volume overall to the car. I am NOT saying it is better sounding, just a FACT that it IS more volume.)

That's my point, though.

Example of 4 identical speakers, sensitivity is 1w=90db@1m.

1 speaker at 1 w makes 90 db.
2 speakers at 1 watt EACH makes 93db.
1 speaker at 10w makes 96db.
2 speakers at 10w each makes 99db.

NOW, for the fun part:
4 speakers at 1w each produces 99db ALSO!

BTW, 6db is the level at which most people sense a "doubling" of volume. And to get 6db, you need to increase power x10 into any given speaker(s) OR add two more speakers of same specs and input wattage.

And, last time I checked, most HU's make like 20w RMS/channel, so when you add 2 rear speakers you are using two additional, seperately powered channels dedicated for the rears. And most people run a 4 channel amp in a 4 speaker system. AND, in my car, I have Infinity 6012i at all 4 stock spots in my car, so yes my car follows these theoreticals.

Don't believe me? http://users.sa.chariot.net.au/~gmarts/amppower.htm

 

I also wanted to add that I realize I am using $40/pr speakers in my car.

If I had the money to buy Focal's or upper end MB Quarts, I would probably not bother running rear speakers since I just invested in good speakers. I would put the biggest, cleanest amp they could handle on 'em.

As you can see I am a cheap as5 and I have obviously chosen quantity over quality. But it's not too bad anyway.

 

and how much does time correction help the clarity when adding rear speakers? Most nice HU's have time correction.

As for concert most people in the baltimore and surrounding area usually agree that Ram's head has the best sound and most of their high's are above you.

 

Time correction does nothing for clarity. It's just a delay, iirc.

 

Well is that true. By timing them right they won't run overtop of each other. I've always seen a noticeable difference.

 

Time correction does not solve the fact that there is less stereo seperation from rear deck speakers (for front seat passengers). Because the speakers are further away, pointed upwards at glass, etc etc the muddled stereo seperation drowns out the front speaker's efforts at seperation.