I was looking to get another 12" in my trunk somehow, I already have three (Punch 3's) with one PGx1200.1. I have only 40" width by 16" on the height, depth is over 50". I was looking at prefab boxes to get an idea and came across this one but I don't see ow it would work. It says each sub has its own chamber but wouldn't the two subs on the side cause some sort of low level interference between the two rear firing ones? I am pretty new to box design I usually just keep them a simple cube shape and concentrate on power/placement, have been for years with good results. A friend of mine said to use a cube but section it off in four chambers, two rear and two forward firing but wouldn't one pair have to be out of phase of the other pair and if so wouldn't you get the same amount of bass as with two or is that only if you use a push/pull setup? Thanks for any and all help Polo..
PS- I am going to add another PGx1200.1 one for each pair, great little amps.
PS- I am going to add another PGx1200.1 one for each pair, great little amps.
Ohh here is the link of the box I was getting the idea from http://www.cardiscountstereos.com/catalog page.asp?Product+#=QL412
You would still want all the speakers in phase... It would be better to have all 4 facing the same direction but sometimes its not possible. It looks un balanced to me cosmetically.
I wouldn't be concerned about them cancelling each other out. If 2 speakers are 1/2 wavelength apart they will cancel each other out.
At 25deg c 1/2 wavelengths:
20Hz 28.42 ft
30Hz 18.94 ft
40Hz 14.21
50Hz 11.36
For something different you could do a V shape where the port is often in the center of the 2 pair.
I wouldn't be concerned about them cancelling each other out. If 2 speakers are 1/2 wavelength apart they will cancel each other out.
At 25deg c 1/2 wavelengths:
20Hz 28.42 ft
30Hz 18.94 ft
40Hz 14.21
50Hz 11.36
For something different you could do a V shape where the port is often in the center of the 2 pair.
I agree, it didn't look so good to me either. Maybe you could draw me something up just as an idea. I am not looking to enter contests and my gear is mid grade at best (3x Punch IIIs + PGx1200.1). Believe it or not I have opted to keep it stock so I am running a stock Delco/Bose head unit with a PAC adapter and use the stock mids/tweeters because believe it or not the Bose (2001 Pontiac GTP) does not sound half bad. In fact it has very little distortion compared to the older crap Delco's and the Bose amp does a good job at controlling the output level to keep the drivers sounding ok. I may change it all over but I like the stock look, kinda throws my friends off when they look inside and I say it is all stock and as they walk away I find an old techno thumper on my IPod and just let the bass drop, lol. It took me a LOT of time, effort and dynamat to kill the rattles but was well worth it so it doesn't sound like some hoopty running around town with the license plate screaming away, lol. If indeed I do get a fourth 12 installed I will upgrade the wiring, drop the bose amp and add a four channel amp, and line driver to the picture because I highly doubt the PAC unit is pushing the max 8v my PG can handle on input. Polo..😉
Having trouble finding image. The arrangement is often done in blow throughs into truck beds. Or if your not limited in height do 4 on a slant perhaps. The input signal is more for setting the gains. A larger signal has more potiential for a better s/n(signal to noise) ratio but you should be able to obtain full output with a fraction of 8v.Safe_Cracker said:
truck bed
I got you, took me a moment, lol 
. Looks to me that the bose amp will be going sooner than I thought as it is under the rear deck and if I am going to move it, then I will just replace. Thanks for your help! Polo...😀
. Looks to me that the bose amp will be going sooner than I thought as it is under the rear deck and if I am going to move it, then I will just replace. Thanks for your help! Polo...😀- Status
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