Amp2Sub Question

[GlItCh_MP]

Just trying to learn about my subs and had some quick questions.

1. Can you blow/damage two 50-250W rms 750W max 4 ohm sub on a 200W @ 4 ohm mono amp?

-Follow Up:
Distortion can be bad for subs and cause damage, how much distortion is bad? My subs don't get muddy or really loose any sound quality, but around 20 out of 35 volume they get a vibration noise(which I asked about in another topic). It doesn't get any louder then if you put your finger nail on the front of the sub in fact it's less noticable then that, but makes me wonder if it may cause damage, or if there are other reasons why it would distort like that.

Also, my cd deck doesn't have the sub volume maxed, it's at 10 out of 15 and Bass at +1 for bass boost.

 

[chuyler1]

Tell us the equipment you have and we can help a little more...

For now, to clear things up, you are connecting 2 4ohm 250W subs to a mono amplifier that puts out 200W @ 4ohms? If so, you are probably giving the amp a 2ohm load by wiring the subs in parallel. Most amps will double their power at 2ohms so the subs are seeing about 400W RMS.

This is well within reason as long as your gain is set properly. I'll let someone else take it from here.

 

[GlItCh_MP]

2 x ALPINE TYPE E SWE-1042
-RMS Power Range (Watts) 50-250
-Peak Power Handling (Watts) 750
-Size 10 -inch
-Impedance 4 ohms

Alpine MRP-M350 200W
-200 watts RMS x 1 at 4 ohms
-350 watts RMS x 1 at 2 ohms
-Maximum Power: 700 Watts

Alpine CDE-9843 CD Deck

Got them as a packedged deal from alpine

 

[GlItCh_MP]

Bump

I really need to know how my subs are distorting on the high-end. I can max them at low-mid bass with no distortion but if it goes too high then there is a buzz that emits. Any easy fix to this on amp settings?

Edit: Did a little investigating and was wondering, could the Bass Boost set at 12db be causing this?

Re-Edit:
Right now all of these settings are maxed
http://www.crutchfield.com/S-UPw7ab...id=morephotos&i=700HAM349&pi=6&display=XL#Tab
If no one responds, First thing I'll try is set the EQ to 0 db if anyone wants to lend their 2 cents I'm not against it.

 

[chuyler1]

Set the gain to the line before max. It should never be at full tilt.
Set the bass eq to 0db.
Set the LP filter to 90Hz.

For best results, the voice coils of each sub should be wired in series. The two subs should be wired in parallel. If you don't understand this, read the following tutorial:
http://mobile.jlaudio.com/support_pages.php?page_id=161

 

[GlItCh_MP]

Obviously they are in parallel. I understand the Gain and Eq settings, but why do you suggest the LP filter at 90hz ? Just wondering.

 

[chuyler1]

Subwoofers are designed to play sub-bass. Most speakers can play down to about 80-100hz without trouble. You want the subwoofer to pickup where the speakers leave off.

If you set the LP filter (also known as a low-pass crossover) too low, you will not get all of the bass notes and only the lowest of bass lines will be audible. If you set it too high, male voices will sound boomy and muddy.

75-100Hz is the ideal cutoff for most systems. Sometimes, if you only have 4" or 5.25" speakers up front you can raise it to 120Hz. If you have plenty of power to your front speakers and they are at least 6.5" then you can go as low as 50Hz...it all depends on the system.

If you have an external amp for the other speakers in your car, it is best to high-pass filter them at about the same frequency.

 

[GlItCh_MP]

My setup has the speakers seperate from the subs.

So for an external amp/sub setup what would be the optimal LP setting.

I ask because the bass for the speakers can be raised between 60-120 hertz. So if I put it at 80 then I would want the amp for my subs at 80?

I'm new to this, this is my first system. But I'm just wondering what will sound better, my speakers going down to 60/80/100 or 120 and leaving my subs to pickup from that point.

Thanks for the help though, I now completely understand the use of the LP Filter.