Speaker Q's....Front Doors - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Bill Roberts · 06-02-2003, 05:19 PM

I am going to do my doors next week with a 5" dynaudio driver and a TB (tangband) dome tweeter. It will all fit. I am going to make a plate from 1/4" lexan and cut it perfect for the 4X6 hole. The drivers will just go in perfect. At the same time (the tweeters are going forward) I will have then at a 30 degree angle up and back. Behing the speakers I am going to get some of that thick hard felt they use between concrete joints and line the innerwalls of the doors (poormans dynamat) and then if you put dampning material back there, it will rust your doors so what I will do for dampning is build a quazi 4th order network at 100hZ and 1300HZ (The TB tweeters are flat down to 900hZ) and tune the passive crossover to dampen out and door resonances that are objectionable.

The drivers will cost less than 160 for both doors and the crossover parts less than 30. I will have great imaging up there and 200 watt power capacity. It will sound sweet.

For the rear, I am going to use a pair of Madisound 1252 DVC woofers, each in their own 1.2CU FT Box. Since it will be isobarak, I only need 1.2cuft for the pair to be flat to 25hZ (which is very low) I have done it before and they will go super low. Their resonance is 15hZ so they will play to 25HZ in the car in that small a sealed enclosure. Takes up very little space. For lower mids in rear fill, I have a matching pair of 8 inch woofers that will do the 60hZ to 1000hZ. They will be in a free field environment in a new shelf I am building for the hatch. It will look good, be reinforced and you will not see any speakers as I have found acoustically transparent carped (black) that the mid bass will go through. Speakers will be mounted from the bottom. I will drive the whole system with a single precision power 100 watt per channel amp. It will make 125dB (plenty for an old man) and be quite balanced. Also the entire system, amp, baffles and all only weighs 40 pounds so it will not hurt performance (speed and handling) as a monster box would. By the way, the spare tire well is exactly 1.3 CU FT and I will use it as the box. Isobarak loaded woofers use 1/2 the cuft as a pair (same as one) and handle more power and go lower. IF I get a flat tire, I got AAA. Hopefully a good looking babe is driving the tire truck!

BTW, Those 1252DVC are made for sound quality to 125 DB not for competition. 100 watts per woofer is the max. They go super low and hit super hard if 125dB is enough for you.

06-02-2003, 05:19 PM	#1
Bill Roberts Zilvia FREAK! Join Date: May 2003 Location: S FL. Posts: 1,538 Trader Rating: (0) Feedback Score: 0 reviews	I am going to do my doors next week with a 5" dynaudio driver and a TB (tangband) dome tweeter. It will all fit. I am going to make a plate from 1/4" lexan and cut it perfect for the 4X6 hole. The drivers will just go in perfect. At the same time (the tweeters are going forward) I will have then at a 30 degree angle up and back. Behing the speakers I am going to get some of that thick hard felt they use between concrete joints and line the innerwalls of the doors (poormans dynamat) and then if you put dampning material back there, it will rust your doors so what I will do for dampning is build a quazi 4th order network at 100hZ and 1300HZ (The TB tweeters are flat down to 900hZ) and tune the passive crossover to dampen out and door resonances that are objectionable. The drivers will cost less than 160 for both doors and the crossover parts less than 30. I will have great imaging up there and 200 watt power capacity. It will sound sweet. For the rear, I am going to use a pair of Madisound 1252 DVC woofers, each in their own 1.2CU FT Box. Since it will be isobarak, I only need 1.2cuft for the pair to be flat to 25hZ (which is very low) I have done it before and they will go super low. Their resonance is 15hZ so they will play to 25HZ in the car in that small a sealed enclosure. Takes up very little space. For lower mids in rear fill, I have a matching pair of 8 inch woofers that will do the 60hZ to 1000hZ. They will be in a free field environment in a new shelf I am building for the hatch. It will look good, be reinforced and you will not see any speakers as I have found acoustically transparent carped (black) that the mid bass will go through. Speakers will be mounted from the bottom. I will drive the whole system with a single precision power 100 watt per channel amp. It will make 125dB (plenty for an old man) and be quite balanced. Also the entire system, amp, baffles and all only weighs 40 pounds so it will not hurt performance (speed and handling) as a monster box would. By the way, the spare tire well is exactly 1.3 CU FT and I will use it as the box. Isobarak loaded woofers use 1/2 the cuft as a pair (same as one) and handle more power and go lower. IF I get a flat tire, I got AAA. Hopefully a good looking babe is driving the tire truck! BTW, Those 1252DVC are made for sound quality to 125 DB not for competition. 100 watts per woofer is the max. They go super low and hit super hard if 125dB is enough for you.