hawkei67 Posted May 18, 2011 Report Posted May 18, 2011 I currently have 2 old Radio Shack 8" CSW-8000 in a sealed box with a divider between the sub woofer sections seperating the 2 subs (creating 2 seperate chambers, 1 for each sub) and it used to have 2 long rectangular tweets but I removed those and sealed off the ports where they were at, I am running them thru a standard Ford Taurus 4-door sedan radio/tape/cd player (standard one but no cd changer so I can't use the cd function on the radio) with an old school Pioneer 220 watt amplifier with the subs hooked in standard wiring configuration (+ to + and - to -) and the back of the box is right up against the back seat frame and the front of the woofers face toward the back of the trunk of the car. I use an mp3 player connected to a casette tape that slides in the casette tape slot of the radio. This thing hits really hard for cheapo old school subs in a prefabbed box that used to have different subs in it and a cheapo amp, I have a beaded necklace hanging on the rear view mirror and with the volume turned up to 2 dots (maximum volume is 10 dots) listening to Sicilian Bass by Bass Cube it bounces around pretty good and you cannot see at all out of the rear view mirror and you can barely see out of the side view mirrors, you can also not place a watch, 20oz soda (full or not) on the trunk lid without it bouncing everywhere pretty good with the volume up at only 2 dots (maximum volume is 10 dots) and the amp is only turned 3/4 of the way up. The highest SPL I can get is a Normalized Amplitude Response of around 2.52dB at 121.7Hz and a Custom Amplitude Response of 115.9dB. I want to get the most SPL I can get outta this thing as possible (around as high as 95Hz to as low as around 15Hz) without changing the amp or radio just the box or possibly a different brand and size woofer that I have laying around, I am extremely strapped for cash right so don't really have the money for good quality stuff. A friend of mine told me to just build a 22x22x28 bandpass box for the 10" Polk Audio db104 sub and place the sub exactly dead center of the box and wire it as standard wiring with 2 ports at 3" o.d. x 9" long. Does this seem fesible? And for the 2 8" I have currently in my car, he told me I should junk that box and build a 22x22x27 bandpass box with the sub baffle in the dead center of the box and mount the subs and use the same 2 port diameters and length as the single 10" from above and use standard wiring configuration. Does this one seem fesible? Here is my current setup which does hit pretty had despite the el-cheapo subs and prefabbed box: File: my 8s in the current sealed box.bb6 ----------------------------------------- Driver Properties Name: 40-1017 (PRO-CSW800) Type: Standard one-way driver Company: Radio Shack Comment: Pro-Series No. of Drivers = 2 Mounting = Standard Wiring = Separate Fs = 45.1 Hz Qms = 12.07 Vas = 21.8 liters Cms = 0.326 mm/N Mms = 38.2 g Rms = 0.897 kg/s Xmax = 5.112 mm Xmech = 7.668 mm P-Dia = 166.2 mm Sd = 218 sq.cm P-Vd = 0.111 liters Qes = 0.6 Re = 2.89 ohms Le = 1.1 mH Z = 4 ohms BL = 7.21 Tm Pe = 100 watts Qts = 0.57 no = 0.321 % 1-W SPL = 88.4 dB 2.83-V SPL = 91.64 dB ----------------------------------------- Box Properties Name: Type: Closed Box Shape: Prism, slanted front Vb = 0.744 cu.ft Qtc = 0.999 F3 = 57.97 Hz Fill = none I did both for all to check out. Please let me know if he was correct. He just came up with the numbers right off the top of his head without needing to know what kind of subs I am wanting to use and he did not use any software to come up with these numbers so I did just as he said but through a computer program called BassBox Pro and came up with the following. Let me know what ya'll think and which one I should go with for best SPL using music such as gucci mane, young money, bass outlaws, ect.... I use my rear deck mounted 5x7's and front door 4x6's for the high end of the frequency band so the high end is fine, I just want the heaviest bump I can get using the subs I have on hand without spending any more money other than for the MDF material. Sorry if this is a dumb question and please feel free to criticize if you wish. The single 10" Polk Audio in a bandpass box shows a maximum Normalized Amplitude Response of 12.4dB at 30.01Hz and a Custom Amplitude Response of 122.7dB as you can see if you use BassBox Pro and the following info: File: single sub wired as single in bandpass freinds bandpass.bb6 ----------------------------------------- Driver Properties Name: db10 (4 ohm) Type: Standard one-way driver Company: Polk Audio Comment: DB Series No. of Drivers = 1 Fs = 26.7 Hz Qms = 4.91 Vas = 44.9 liters Cms = 0.24 mm/N Mms = 148 g Rms = 5.058 kg/s Xmax = 8.7 mm Xmech = 25.4 mm P-Dia = 215 mm Sd = 363 sq.cm P-Vd = 0.316 liters Qes = 0.409 Re = 3.7 ohms Z = 4 ohms BL = 15 Tm Pe = 300 watts Qts = 0.376 no = 0.201 % 1-W SPL = 85 dB 2.83-V SPL = 88.54 dB ----------------------------------------- Box Properties Name: Type: Bandpass Single-Tuned Box Shape: Prism, Bandpass with two chambers Chamber 1 - lower-freq. Vb = 3.181 cu.ft Fb = 32.64 Hz QL = 7 F3 = 5 Hz Fill = none Chamber 2 - upper-freq. Vb = 3.229 cu.ft Fb = 31.16 Hz QL = 7 F3 = 38.46 Hz Fill = none No. of Vents = 2 Vent shape = round Vent ends = two flush Dv = 3 in Lv = 9 in And here is the one he suggested for the 2 old school Radio Shack 8" CSW-8000 in a bandpass box and it shows a maximum Normalized Response of 8.63 dB at 27.75Hz and a Custom Amplitude Response of 122.1dB. File: dual subs wired as single in bandpass freinds bandpass.bb6 ----------------------------------------- Driver Properties Name: 40-1017 (PRO-CSW800) Type: Standard one-way driver Company: Radio Shack Comment: Pro-Series No. of Drivers = 2 Mounting = Standard Wiring = Separate Fs = 45.1 Hz Qms = 12.07 Vas = 21.8 liters Cms = 0.326 mm/N Mms = 38.2 g Rms = 0.897 kg/s Xmax = 5.112 mm Xmech = 7.668 mm P-Dia = 166.2 mm Sd = 218 sq.cm P-Vd = 0.111 liters Qes = 0.6 Re = 2.89 ohms Le = 1.1 mH Z = 4 ohms BL = 7.21 Tm Pe = 100 watts Qts = 0.57 no = 0.321 % 1-W SPL = 88.4 dB 2.83-V SPL = 91.64 dB ----------------------------------------- Box Properties Name: Type: Bandpass Single-Tuned Box Shape: Prism, Bandpass with two chambers Chamber 1 - lower-freq. Vb = 2.954 cu.ft Fb = 55.45 Hz QL = 7 F3 = 5 Hz Fill = none Chamber 2 - upper-freq. Vb = 3.031 cu.ft Fb = 32.16 Hz QL = 7 F3 = 45.61 Hz Fill = none No. of Vents = 2 Vent shape = round Vent ends = two flush Dv = 3 in Lv = 9 in And he also told me to place the ports (vents) in the HF end, I thought they were suppose to go in the LF end. I have also been told to just design a bandpass box for either the single sub or the 2 subs at around 33Hz for the LF chamber and no more than 85Hz for the HF chamber. Is this true? Do either of these seem fesible for my type of music and trunk compartment to get high SPL? Should I waste my time building one? Should I just tweak one of these to get great SPL, and which one should I start tweaking so I can started on building it? Material is not cheap when you are poor like me, lol.
fritosaregood Posted May 18, 2011 Report Posted May 18, 2011 I didnt read past the first paragraph, but trying to get some cheapo 8" subs that are only doing a 115db right now to be "loud" at 15 to 95hz isnt gonna be too easy, or possible seller feedback: http://www.stevemeadedesigns.com/board/ind...showtopic=61719 http://www.stevemeadedesigns.com/board/ind...showtopic=68281 build log: http://www.stevemeadedesigns.com/board/index.php?showtopic=44800 Gf's build: http://www.stevemeadedesigns.com/board/topic/54346-kickergirls-camaro-new-box-pg-5/#entry753970
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