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Old 03-15-2006, 07:54 PM   #1 (permalink)
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Amp/cross over help

Hi all, Ive got some boston acoustics RC420 and have noticed they arent too powerful. Theyre 4'' so I didint expect them to be the loudest but the bass doesnt go up very high without distortion. They are component speakers so im not sure if theres not enough power going to them or if tehy just arent meant to get loud. Do components use up more juice so that they need more power? If I give it more power, will they just blow or will the bass get undistored at higher volume?? any help would be greatly appreciated !
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Old 03-15-2006, 09:09 PM   #2 (permalink)
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oh, and btw, the wires running from my car to the speaker are the stock ones that came with the car. Dont know if that matters, maybe the stock wires give lesess power?
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Old 03-16-2006, 02:07 AM   #3 (permalink)
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Not much you can do. 4" mids are not going to do much in the midbass dept. However...They are great for covering the complete vocal region (150hz-2Khz).

What kind of car do you have?

You may want to do an add on midbass and run a 3 way setup up front.

Or you can also get a sub and cross it over at about 100hz-120hx, but it's not really gonna be upfront midbass at that point.
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Old 03-16-2006, 02:16 AM   #4 (permalink)
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Yeah 4 inch speakers are not going to handle a lot of bass regardless of what is printed on the carton. The cone is just not big enough to produce enough doof.
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Old 03-16-2006, 10:52 AM   #5 (permalink)
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Oh, i see. i have a 94 corolla dx. So will an amp really do much at all for the front speakers? Would an amp be more effective in the back with 6.5'' alpine type R. I already bought an amp so I might as well use it.
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Old 03-21-2006, 08:44 PM   #6 (permalink)
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Will it will it??/ bump^
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Old 03-21-2006, 09:14 PM   #7 (permalink)
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well sincethe speakers are 4inch mids an amp wont really help them to much. (im assuming you cant fit a bigger speaker yup front without cutting something)

what amp you got? mabe you can use it for a sub.....
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Old 03-21-2006, 11:24 PM   #8 (permalink)
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3rd Generation

4" components are designed for mid to high feq responce. Make sure the speakers are in phase 1st. Fade your stereo to the front then balance side to side. If you hear more mid bass when you balance side to then you have a speaker out of phase. This can also happen front to back. Also, check to see if you have the cross-over wired correctly. It happens to the best of us. Try powering the speakers with a 50 RMS watt amp. Set the Amp to HFP (high feq pass) and the listen to the sound.

Now, they are 4" components. They will not put out that much bass. you should be able to fit a 5.25" in the door and a 6.5 in the rear deck if you try. Look at the basket of the speaker. (metal part around back of cone and voice coil) see if it will clear opening and if it will allow the window to move up and down.

If you want bass NOT sub-bass try a sealed 8" woofer in the trunk with an amp. Look to a Basoka tube (poor speller). If Bumps you want purchase a Ported box with a port feq of 35 hz or 38 hz a little high but if you like rock it will work, rap set it from 28 - 35. NEVER SET A SUBWOOFER to a feq above about 80 hz. 100hz if you are doing a PA. It just makes the subwoofer humm. And the sound is poor.

We sell the Alpine Type-R at the car audio shop I work at. It sounds great with the right amount of power and a clean sounding amp, Alpine, Clarion, Xtent, Mb Quart, Eclipse, JBL. About 50 - 100 watts RMS.

Last edited by madmax_cam; 03-21-2006 at 11:31 PM.
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Old 03-22-2006, 09:27 PM   #9 (permalink)
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Thanks for the replies. The amp I bought is from ebay. The link is http://cgi.ebay.com/New-Lightning-Au...QQcmdZViewItem

Is is 450 watts max power, 150x1 @ 4 ohms, 75 rms @ 2 ohms, 50rms @ 4 ohms, HP/LP crossover: variable 40-400hz. I dont knwo much about amps so hit me with the advice! Should I run the amp on the 6.5 rear alpine Rs or save it for a sub box? I dont want to test the amp on the front speakers because I dont think it will do much and im getting a friend to install it and dont wana make it too complicated. I cant fit a 5.25 in the door without customizing. :X
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Old 03-22-2006, 09:28 PM   #10 (permalink)
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Oh, and its a 2 channel amp.
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Old 03-23-2006, 10:36 PM   #11 (permalink)
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bumPP
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