low pass crossover

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=102147
Printed Date: May 14, 2025 at 9:06 AM

Topic: low pass crossover

Posted By: theetimurban
Subject: low pass crossover
Date Posted: February 13, 2008 at 12:40 AM

i already know the answer to this question, but my little brother won't stop fighting with me about it, so i'm asking people with a lot more experience, and phrasing this as unbiased as possible:

true or false? an amp with a low-pass crossover of 50-150hz will play no frequencies lower than 50hz...

i'm hoping people that really know what they're talking about will answer, and throw in a why.

Replies:

Posted By: jmelton86
Date Posted: February 13, 2008 at 1:37 AM

False. The amp will amplify frequencies below 50Hz, but no higher than 50-150Hz (if the low-pass filter in turned 'on').

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Posted By: audioman2007
Date Posted: February 21, 2008 at 8:37 PM

That is correct jmelton but the crossover wont do a solid cut at 50Hz. Depending on how steep the crossover slope is, some frequencies above 50 will still come into play but wont be amplified as much.

Posted By: audioman2007
Date Posted: February 21, 2008 at 8:41 PM

I totally read that wrong. What I meant is that some frequencies slightly above the crossover will still be heard but wont be amplied as much. Meaning if the crossover is set to 130HZ, frequencies a few above will still be heard somewhat, but a higher crossover slope means the amp will do a better job of cutting those "unwanted" frequencies out.

Posted By: jmelton86
Date Posted: February 21, 2008 at 9:12 PM

True. I just didn't want to get into all that. Just wanted to answer his question. posted_image

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Posted By: theetimurban
Date Posted: February 22, 2008 at 5:42 AM

Yeah, no it was fine. I don't know where he got the idea, but he thought that because it said "low-pass crossover 50-250hz" he thought it meant it would only play 50-250hz. to which I said, "then why can you adjust it?" then he just became a little brother and started fighting with me, even though he knew he was wrong.

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