Car Audio Questions That Need Answers

[Trey803 5,000+ posts]

So I have a couple of question that Im still not able to understand the answer to and would like some explanations. First off is the topic of on/off axis componenets. What is the physical explanation of what occours to the sound waves in an off-axis application? Why is it recomended to change the polarity of the tweeter when running off-axis and how come some component sets work better off-axis than other. Would proper T/A reverse the effects of being off-axis? The next question is about fiberglass enclosures....I dont understand how people measure the exact internal volume of an enclosure that is molded to the corner of a trunk or any fiberglass enclosure that contains curves in it? Any help would be appreciated thanx.

Click to read more...

 

[kickerlivinloud 10+ year member]

For the first question I can't help you but the fiberglass question is actully a lot easier then you'd think. Here are a couple pics to help explain what I mean...

Take packing peanuts and fill the enclosure with them. Once you have the enclosure full take a calibrated box (box in of which you know the volume) and fill the calibrated box. Right down how many of the calibrated boxes it took and that will tell you how much air space you have in the enclosure..

Hope this helped ya out a little bit..

Jon

 

[Trey803 5,000+ posts]

yes but how would you know BEFORE you build the box? I wouldnt want to make a box and then find out how big it is

 

[nismos14 5,000+ posts]

Break it down into sections and / or make it bigger than necessary then build inside to make it smaller.

 

[kickerlivinloud 10+ year member]

Ohhhhhh. Maybe get a plastic trash bag, fill it with peanuts and make it the approximately size as you enclosure. That will give you a ball park idea. Just an idea...

Jon

 

[TreyE 10+ year member]

are you really supposed to change polarity in tweeters when off axis?