June 2, 200520 yr Last summer I replaced the speakers on my 2000 Forester. The front speakers are 6 1/2" Panasonic and the rear ones are 4" Sony. I am using a size adapter for the rear as the original ones are 5" and hard to find in a decent brand. All are working fine and sound fantastic ! Someone suggested using bass blockers on the rear speakers for better sound and "to protect them". They aren't expensive. Crutchfield carries them and I've seen them on eBay too. Your comments and suggestions are appreciated. ~Howard :cool:
June 2, 200520 yr Are you severly overdriving the rear speakers? Is there distortion from the bass? If no, then I wouldn't worry about it. What do these bass blockers cost with respect to a new set of speakers? Turn it up! -Heikki
June 2, 200520 yr Author Are you severly overdriving the rear speakers? Is there distortion from the bass? If no, then I wouldn't worry about it. What do these bass blockers cost with respect to a new set of speakers? Turn it up! -Heikki I don't think I'm overdriving any speaker. The rears sound fine to me. The cost of the blockers is $10 -$15. No big deal but I was just curious. ~Howard
June 2, 200520 yr They are normally intended for installations where there are a pair of extremely small speakers mounted in the pillars or top of dashboard. A factory installation or one where all speakers are approximately the same size and power rating would not call for them.
June 2, 200520 yr Author They are normally intended for installations where there are a pair of extremely small speakers mounted in the pillars or top of dashboard. A factory installation or one where all speakers are approximately the same size and power rating would not call for them. The 4" Sony {XS-W4021} are mounted in the rear doors. The 6 1/2" Panasonic are mounted in the front doors. ~Howard
June 2, 200520 yr A bass-blocker is most likely just an electrolytic capacitor wired in series to act as a DC (in this case low frequency) blocker. My 5-1/4" Kenwoods have them.
June 2, 200520 yr Author A bass-blocker is most likely just an electrolytic capacitor wired in series to act as a DC (in this case low frequency) blocker. My 5-1/4" Kenwoods have them. That's exactly what they are. But are they necessary on the 4" speakers ? ~Howard
June 2, 200520 yr If the speakers in question are physically bottoming-out at high volume, then "capping 'em off" will remedy the problem. Use the largest value that does the job, unless your deliberately trying to tune out some boxy-sounding low-mids (200-300 Hz), then go smaller. In a lower power system where the amp doesn't have the ability to bottom out the suspension, then there's no advantage to adding caps.
June 3, 200520 yr I had a set in my 87 Hatchback, since I was driving my subs off the deck cuz I didnt' have enough $$$ for an amp at the time, I got the 150 Hz ones but I should have gotten like the 75Hz ones, the idea is that it'll take out the low frequencies that those small speakers wont' reproduce anyway, so the speakers won't distort at high volume.
June 3, 200520 yr Author Thanks to everyone for their help and suggestions. I ordered the ones on eBay for my rear (4") speakers. ~Howard
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