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View Full Version : Should the Boston Pro 60's be able to handle this?



Clean Sound
08-28-2006, 09:56 PM
I have the Pioneer DEH P780MP head unit sending the signal to the Alpine MRV F345 75X4 amp with the Boston Pro 60's in the front and the Boston SL 80's in the back. I also have a sub with a separate amp driving it.

On the head unit I have the following settings:

HPF 100, Slope 6
LPF 80, Slope 12
Equalizer settings are at 80hz +2, 125hz +2, 200 +1
Loudness Off
BBE On at +2 out of 4.
Comp On at setting 2

Here is my concern: When listening to hard rock like Queen Fat Bottom girls, AC/DC Back in Black or even the newer Nickleback How You Remind Me and really any song where you hear that hard kick drum (I am thinking around 100 - 200hz) the right front speaker gives out at louder 2/3 volume. I am thinking that should not be happening with the Pro 60's. So I either turn the base down or increase the slope. But is this natural or should I be complaining to the dealer?

These are excellent speakers that have strong mid base but I am thinking I should be able to set the filter at 80 and they should be able to handle it easily the way I have this deck configured. I am worried I have got a tear in that front speaker. I read that they can handle so much power and yet they are failing on me.

Any thoughts on this?

cleanerupper
08-28-2006, 10:03 PM
What do you mean it "gives out"? It stops working once you go above 2/3 volume?

Clean Sound
08-28-2006, 11:40 PM
What I mean is that the crisp bass sound turns into a bfffffffff -- like the speaker is starting to blow. Does that makes sense?

cleanerupper
08-29-2006, 12:37 AM
Is your speaker sealed into your door correctly? If not, do that.

Also I would get rid of the EQ at 125Hz and 200Hz, and widen the Q of the boost at 80Hz a little bit. Your amp might be either clipping from too much boost and/or pumping too broad of a frequency boost into the speakers (80-200Hz), causing the distortion effect at higher volumes. You have to be careful boosting midrange sounds.

You say your components are high passed at 100Hz@6db/oct, so lower frequencies shouldn't be the problem causing distortion.

I don't know what BBE or Comp is because I don't know Pioneer decks, but it sounds like they may be audio enhancement features, which also apply their own bass boost. Try lowering the setting to 1 or turning it off all together. If this gets rid of too much midbass, you can raise up equalizer settings to compensate.

Still, try to use only 1 band of EQ in the 80-200Hz range, not 3, since that will introduce distortion earlier. Instead, try centering the boost at 100Hz and widening the Q a bit.

Clean Sound
08-29-2006, 10:05 AM
Thank you, this was helpfull. The Comp/BMX setting has a profound impact on the sound and in particular the Comp setting does boost the bass quite a bit. So even though the EQ is not set that high, the additioanl boost from the Comp setting is probably too much when all is factored in. I will fiddle some more with the settings and see how it goes.

audiolife
08-29-2006, 04:01 PM
mount the speaker better and give it some more power. 150 watts does almost any ba set i ever seen some good

Eugenics
08-29-2006, 04:13 PM
you do know you can easily feed those 300 watts rms each

pepsican
08-29-2006, 05:10 PM
hear that hard kick drum (I am thinking around 100 - 200hz)

Depending on how the kick drum is tuned, its actually a lot lower than 100hz. Its more around 40-60. It does have other things involved, like the mallet hitting.