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Sub adjustment, auto adjustment?

Old 11-14-2016, 06:23 AM
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Default Sub adjustment, auto adjustment?

Forgive me if this has already been covered I'm looking for a little advice on a stereo setup.

My current system is a CMD5 with (2) 1200w amps, one for the two subs and one for 4 cockpit speakers. The stereo sounds great when manually adjusted. When the volume is low I put the bass up to anywhere from +3 to +5. When the volume goes up I have to walk the subwoofer adjustment back down to around -1 to 0 to keep the subs from distorting.

My questions are:

Is the system setup improperly or is this normal?

I was looking at replacing the old CMD with the new JL or Rockford fostgste displays, but without hard dials on the head unit adjusting the volume and bass would be more work than it's worth.

The only other option I've seen is the zone adjustment bar from wet sounds...

Any input is appreciated.
Old 11-14-2016, 06:43 AM
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What amps and speakers are you using?

My first thought is you should go through the system channel by channel and make sure your amp gains and crossover points are set properly. Make sure you do this with everything set flat on the head-unit. After you do this, if you still feel that the Mid's and High's over-power your bass at lower volumes, I would dial back the gain on your Mid's and High's until you feel it is balanced to your liking.

You shouldn't ever really need to manually adjust the system once it is setup right; definitely not by +3 to +5; every step up can begin to introduce distortion into the signal, which is dangerous for your speakers.
Old 11-14-2016, 08:23 AM
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Thanks for the response,


The Amps are both 1200w audiopipe

2 - 10" 500w audiopipe subwoofers

4 - 6" jbl speakers

The system came on a new to me boat and I'm not much of a stereo buff so I haven't gone through it as you have described.

Is there a standard way to adjust the gains and crossover as you've suggested?
Old 11-14-2016, 08:27 AM
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Try adjusting your crossover settings. When the sub plays higher frequencies you hear more distortion. Start at 80hz and move down from there. Then adjust your speakers to play either the same or 10hz higher than the sub. In my car, I have my sub at 60hz to tighten up the bass, which gets sloppy and boomy at higher volumes and crossover settings. I have my speakers then set at 70hz. they roll off a 24db slope so you don't miss anything in the 60-70hz range.
Old 11-14-2016, 08:51 AM
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Originally Posted by bc545571443 View Post
Thanks for the response,


The Amps are both 1200w audiopipe

2 - 10" 500w audiopipe subwoofers

4 - 6" jbl speakers

The system came on a new to me boat and I'm not much of a stereo buff so I haven't gone through it as you have described.

Is there a standard way to adjust the gains and crossover as you've suggested?
http://www.crutchfield.com/S-iExCAZQ...fier-gain.html

http://www.crutchfield.com/S-QkjGq5o...rs/tuning.html


These two articles are pretty decent ways to correct all your amp settings by ear, while not exact, following these guides will get you much better overall performance.
Old 11-14-2016, 04:16 PM
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We are now doing larger and more expansive audio systems. This has made us take the leap into a scope and other electronic tuning equipment. This will ensure that the system is as close to perfectly tuned as possible. I would look up someone in your area who can do this for you, it will save you the and money in the long run.

Mike
Old 11-15-2016, 05:00 AM
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Mike makes a good point. If the DIY route is daunting for you and you want to make sure it gets done right, assuming your boat is on a trailer, take it to a local pro shop (car stereo shop will do fine, there is no difference in tuning concepts between car/marine). They can tune your amps for probably around $50, basically 30 - 45 minutes labor.
Old 11-15-2016, 07:16 AM
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There are some different tuning concepts between an enclosed car cabin and an open-air boat. But a true pro, whether in automotive or marine audio, should get you a better tune. It's a skill that requires experience over time with repetition and variety.
Old 11-16-2016, 12:58 AM
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Originally Posted by bc545571443 View Post
... The stereo sounds great when manually adjusted. When the volume is low I put the bass up to anywhere from +3 to +5. When the volume goes up I have to walk the subwoofer adjustment back down to around -1 to 0 to keep the subs from distorting.

Is the system setup improperly or is this normal?
As I read your posting, manually increasing the bass at lower listening levels (and decreasing at higher ..) provides satisfactory sound quality. Our ears have different frequency response at different sound levels. Some Audiosystems has a dedicated "Loudness" function that automatically compensate for this "imperfection". As it sounds like the basscompensation is required to satisfy your listening, you probably should look for a frontend or radio with this function included.
But, you might need to adjust the systems overall gain (amplification) to ensure that the Loudness compensation doesn't com in too much or too little.

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