8 ohm house subwoofer in car?
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New member Username: Abuckley1290Post Number: 1 Registered: Dec-06 | Hey this is my first post and would like to know what type of amp (watts/voltage/etc) would be needed to drive a 8ohm 350w rms 700w max amp in a car? thankyou |
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Gold Member Username: James1115Ct Post Number: 7533 Registered: Dec-04 | ebay, ppi a600.2 fits the mold nicely. |
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Gold Member Username: JuliobSanto DomingoDominican Re... Post Number: 3601 Registered: Dec-05 | audiobahn a8002T and bridge it |
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Gold Member Username: James1115Ct Post Number: 7582 Registered: Dec-04 | I would take the ppi twice every day of the weekk ad 10 times on sunday over that audiobahn. |
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New member Username: Abuckley1290Post Number: 2 Registered: Dec-06 | ok...but does it matter b.c its an 8 ohm sub compared to a 2ohm or 4ohm car sub? |
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Gold Member Username: James1115Ct Post Number: 7604 Registered: Dec-04 | nope |
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Gold Member Username: N2audioLawrence, Ks USA Post Number: 1032 Registered: Mar-04 | "does it matter b.c its an 8 ohm sub compared to a 2ohm or 4ohm car sub?" You should just understand that being 8 ohms the amp will be reduced to about 1/2 its 4 ohm power. The a80002t, for example that produces ~800w into 4 ohms bridged will only do about 400w into 8 ohms bridged. Should be great for a 350w 8 ohm sub. |
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Gold Member Username: Mikechec9Post Number: 2481 Registered: May-05 | "You should just understand that being 8 ohms the amp will be reduced to about 1/2 its 4 ohm power." The effects of which will depend on the driver. Right off the bat, increased resistance means a longer coil. Not all of this coil length can necessarily be adequately utilized however...unless it is within the gap. But how do you get these increased windings to fit within the gap? http://www.adireaudio.com/Files/X_68_Motor_Assy.avi http://i22.photobucket.com/albums/b301/mikechec9/SpeakerCrossSection.gif You can make these windings thinner...the VC gauge, or thickness of the strands, could be decreased allowing you to pack more relatively thin windings around the former also reducing the m mass. This, indirectly resulting in greater efficiency. So, these thinner strands could allow for increased windings (around the former) within the gap, potentially raising the strength of the motor/BL...*remember the additional windings means a greater Length of the VC. I.e., Length of the coil in the gap.* So, here, L is directly proportional to the efficiency of the driver. It depends. From a quantitative perspective... Power=V^2/r Power = Voltage^2 / resistance and since most speakers are rated at 2.83v... for an 8ohm speaker: x= 2.83vx2.83v/r x= 8v/8ohms x=1watt similarly, for a 4ohm speaker: x= 2.83vx2.83v/r x= 8v/4ohms x=2watts Recall that every doubling of power equates to a gain of 3dB. So you could potentially power an 8ohm driver with less power, but bc of its increased efficiency it could be just as loud as that of 4ohms. So it depends... Primarily on the efficiency of that 8ohm driver... which, itself, is determined by the speaker's BL and m mass. a very basic tool around with which to play and fiddle: http://www.sengpielaudio.com/calculator-ohm.htm |
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Silver Member Username: CadillacdbHouston , TX Post Number: 894 Registered: Aug-05 | well i guess mike has this one covered |
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Silver Member Username: CadillacdbHouston , TX Post Number: 895 Registered: Aug-05 | what kind of home stereo sub are you trying to use ? |
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New member Username: Abuckley1290Post Number: 3 Registered: Dec-06 | http://legion.madisonamps.com/products/subwoofers/emi-18.htm |
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Silver Member Username: QbenjaminFlorida Post Number: 128 Registered: Nov-06 | for that price you could get an Orion H2 12.4/2..... |
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New member Username: Abuckley1290Post Number: 4 Registered: Dec-06 | I already have them thats why i was looking for a good amp...thanks for all the replies |
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Gold Member Username: James1115Use a simple... Post Number: 7726 Registered: Dec-04 | the PPI does 300 @ 8 ohms and it is one of the best amps you can get It will desimate the audiobahn! |
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