Question about Crown XTi 2000 2-Channel Amplifier

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6000d amplifier cutting off

I have a 6000watt digital amplifier & 2 DVC (2500watts each) 12" subwoofers.the bass cuts off when the volume is increased.The amplifier was recently serviced.What are the recommended methods of connection for these subwoofers to get the best response in terms of competitions & dB's.
My car normally does a dB figure of around 148-150dB.
Can it possibily go any further than that.

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Hi...
Crown has posted on their website all the tech info you can probably use for your situation.

Cheers!

Posted on Jan 18, 2009

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1 Answer

What is the best way to wire two kicker comp r 12' s to a two channel amp for max bass?


First, you need to know whether you have the 2 ohm DVC subs or 4 ohm DVC subs. Second, you need to know the minimum impedance the amp can handle (most are 2 ohm, some are less). Putting two voice coils in parallel will cut the total impedance in half (e.g. 2x 4 ohm voice coils in parallel = 2 ohms total). Putting subs in parallel will also cut the impedance in half.
At one end of the spectrum, you could put the 2 ohms DVCs in parallel, then parallel the two subs, and bridge the 2 channels of the amp. That would put 0.5 ohms impedance on the 1 bridge amp channel. If the amp can do 0.5 ohms x 1ch, do it. Otherwise, you may have to run the subs on separate channels.

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Bass cut off when volume is too high


When an amplifier shuts the Bass off that means its going into protection mode otherwise it will burn out the outputs. One way is to turn your gains down, Pioneer amps are not the best amps for bass out there, they are more for car speakers, I personally wont use a pioneer amp to run my subwoofers especially if they are hard driven subs like JL , Kicker Solo's and MTX subs. But for now just turn the gains down to 3/4 and that should help u, you can also install a fan to keep your amp cooler, if this never happened before in 5 yrs and now it does then that means your amp is just tired and the inside components are overheating easily, thats common with Pioneer and Sony amps.

Good luck buddy.

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The amp says it's 1 ohm stable, so assuming the DVCs are dual 4 ohm, you should be able to connect all "+"'s together and all "-"s together, like the picture below:
0f1cebe.jpg

As for the amp shutting off for a few seconds, it sounds like it's either:
A) Not getting enough power at high volume.
OR
B) Overheating.

The cap on the +12V to the amp should help, but putting a meter on the +12V might tell you whether it's dropping too low (<11V).

When you first turn the volume up, how long does it work fine before shutting off? Is it with the vehicle running or not?

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1 Answer

Installation


Hi JJerky,

I suggest we go for 2 ohm to preserve the amp and not heat things up so bad.
Your Subs are Dual Voice Coil(DVC) and 2 ohms each coil. I am going to tell you the wiring to insure you get balanced response from both Subs. We will wire the Subs Voice coils in Parallel to make them 1 ohm each. Then we will wire the Amp to the subs in series to make the total load on the amp 2 ohms. When you have series to both subs each sub gets the same current.


Example of my coding :SUB1VC1+ = Subwoofer 1 Voice Coil 1 Postive terminal.

SUB1VC1+ to SUB1VC2+
SUB1VC1 - to SUB1VC2-

SUB2VC1 + to SUB2VC2 +
SUB2VC1 - to SUB2VC2 -

AMP + to SUB1VC1 +
SUB1VC1 - to SUB2VC1 +
SUB2VC1 - to AMP -

This should give you a good repsonse.

Adjust your Bass Gain down very low at first. Also cut you LPF to about 60 hz. Crank up the volume on a bass test Audio track, Adjust the Bass Gain up unitl you get distortion. The turn it back a little. This is proper setting for your Gain.

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1 Answer

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You are most likey running too much power from the amp to the speakers.. you might want to try just notching the bass down a notch or 2.. just enough that the bass will hit

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1 Answer

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u should connect at least six 12" subwoofers (preferably 1000W each) to that pioneer amp of yours. Crank it up and enjoy. Your amp shouldn't cut off now. If it does cut off, you should change the fuse on your amp to a higher ampere.

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It sounds like you may have the load impedance too low. How many voice coils per woofer? How many ohms is each coil? If you have DVC woofers, are the coils for each woofer wired in series or parallel? Are the speakers wired in series or parallel. Let me know if you need me to clarify anything.

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Amp cuts off


You may have a problem with the power source feeding the amp. You need to check the voltage across the amplifier's B+ and ground terminals when the amp is playing/cutting off. If it's dropping below ~11 volts, you need to determine why it's dropping so low.

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Hello ed4037, If you are blowing fuses this means that you are drawing too much current check your impedance value on your amplifier it should be 8 ohms to match the subwoofer's 8 ohms of impedance. In addition make sure that you have the proper value fuses. In other words you should not be tuning the amp not to blow fuses, because you should be able to go to full amplitude on your amp without blowing anything. As I alluded to this sounds like an impedance mismatch problem. I hope this helps, Thank you, Shuttle83

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