JL 300/4 amp crossover HELP?

[timmyjimmy5150 10+ year member]

I have a JL 300/4 amp..... It has front and rear croosovers on the amp....

Now.. in each of the 4 doors I have a set of Boston component speakers w/ tweeters.....

When setting the crossovers on the amp.. I have 3 choices...

1.) HP -- high pass

2.)LP -- Low pass

3.) Off

Which one do I want to set it at? Also.. My components came with their own set of crossovers that mount in the doors..... So, would I want the amp crossovers off since the bostons have crossovers already on them? Or do I set it at HP?

I also have a 250/1 for a 10 inch sub under the seat... I believe it is set at LP...

Thanks

tim

Click to read more...

 

[timmyjimmy5150 10+ year member]

Also --- What "Filter slope" do I want? 12db or 24db for my 4 sets of components......

What's the difference?

tj

 

[KyleScha 10+ year member]

You want to set the crossover at about 80hz on the highpass setting.

No, the amps wont cover the crossovers that came with the speakers because those deal with the tweeter and woofer.

What speakers do you have btw?

 

[Prowler573 5,000+ posts]

I have a JL 300/4 amp..... It has front and rear croosovers on the amp....Now.. in each of the 4 doors I have a set of Boston component speakers w/ tweeters.....

When setting the crossovers on the amp.. I have 3 choices...

1.) HP -- high pass

2.)LP -- Low pass

3.) Off

Which one do I want to set it at? Also.. My components came with their own set of crossovers that mount in the doors..... So, would I want the amp crossovers off since the bostons have crossovers already on them? Or do I set it at HP?

I also have a 250/1 for a 10 inch sub under the seat... I believe it is set at LP...

Thanks

tim

//content.invisioncic.com/y282845/emoticons/bigwave.gif.16324171cad2db62cf4f16568b038478.gif Welcome to the forum, Tim.

You'll want the crossovers in the 300/4 set on HP. This stands for High P*** - ergo it allows all the frequencies at or higher than your chosen setting to pass through the filter while stopping everything below your setting from getting through to the speakers. Try starting at about 60Hz and adjust it up or down from there until you get it to a point that your ears tell you, "That's it!"

You wouldn't want to leave the amp's crossovers turned off because the component sets came with their passive crossover units. All those do is route all the highest frequencies to the tweeter while everything lower than what gets sent to the tweeter will be routed to the midwoofer. You'll still want to utilize the HP crossover in the amp to keep the lowest subbass that the components aren't suited to handle out of them.

Having the LP crossover (or Low P***) in use for your sub is the correct setting. Try starting about 75Hz and again, move it up or down until your ears tell you you've gotten it where it needs to be. An LP crossover is exactly what it sounds like, the exact opposite of a HP crossover.

Good luck getting it sorted out, friend. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif