car system using pa speakers! |
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Tom Umney
Registered User Joined: 26 February 2004 Location: United Kingdom Status: Offline Points: 4954 |
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Posted: 08 September 2004 at 8:02pm |
I think two Eminence HL10's simular to Lab 12 but 10 inch version would make a excellent car subwoofer if in the right ported box! Or P.Audio TM-12 subs RCF L8S800 8 inch, 175 w rms BASS/mid in front doors, or Beyma 650ND Eminence APT80 tweeter and Beyma 2 way crossover Although u would need slightly bigger cutouts in the doors it would give much better results than using crappy car speakers. And drive them with 2 seperate Audiobahm or custom built amps! |
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Rog
New Member Rogers Archive Posts Joined: 23 March 2010 Status: Offline Points: 2166 |
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Hi, I have a P Audio SN 15 MB in a 100 litre closed box in the back of my car and drive it with 400 wrms. I get nearly 140 dB out of the system. Sysytem is 4 way active. Rog. |
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Wrighty
Old Croc Joined: 17 April 2004 Location: Devon Status: Offline Points: 1801 |
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PASC
Registered User Joined: 11 November 2004 Status: Offline Points: 12 |
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Hy Rogborg How you got it, 140db? Putting the microfone near front window at about 70cm height near right door? With the car hermetically closed in a car championship? At what frequency band? What are PAudio SN15 sensivity, specs? What are the gig (cd player, crosover, amp etc)? Regards, Paulo Duto. |
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Lord Baccus
Registered User Joined: 21 November 2004 Location: United States Status: Offline Points: 175 |
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140 in a sealed ??? what type of car ? and were you mesuring DB or SPL ? my 15" SS T4 is getting around 148.8 SPL from a TermLab Mic... 140 is not impossable depending on the type of car/Truck a lotta people hitt 140 Easy w/good sub in a decent box & amp
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PASC
Registered User Joined: 11 November 2004 Status: Offline Points: 12 |
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Hi Lord Baccus A good car subwoofer should have a sensivity of around 90 db plus 30db with 1024Wrms = 120db. You should be experimenting the boundery effect which comes from 70 hz down in the car like a Golf and closed doors and windows, as well as the microfone should be positioned 1/4 of wawe lenght, it est, box with subwoofer firing in direction of back window behind back seat. It functions like an air compressor tank in the car. Open the back door and let the sound of the sub play to outside of the car you will have what it actually plays. The rest are side effects. Here in Brazil they use the Linear EX mics and computer sound cards which are usable up to 170 db as per specs. I don't know how they can measure 174 db!? Should be something with the calibration of mic/program... Regards, Paulo Duto. |
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Lord Baccus
Registered User Joined: 21 November 2004 Location: United States Status: Offline Points: 175 |
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Hi Paulo Duto. im in Dallas TX USA and the Specs for my Monster is owners manual says 4.0cf after displacement of woofer, without sub should be 4.25 sub displacement is 0.23, the T/S are as follows for the T4-15 I built the enclosure to specs it is 4.25cf befor displacement & 4.0cf after port & Sub, tuned @ 35Hz, im only using a JL Audio 500/1 for now to break it in will be getting a JL 1000/1 soon |
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