so i want to amp my system

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xancilleryx

Member - Posts: 5

Joined: September 14, 2010

Location: Nevada, United States

Posted: September 14, 2010 at 4:40 AM / IP Logged

So im going to be amping my system and was thinking about running 2 4 channel amps in bridged modes to drive the front and rear speakers respectively. I havent been able to find a 4 channel amp that will drive my CDT audio speakers at the 130 RMS rating unless I want to spend close to 500 - 600 bucks.

So why not use 2 4 channel amps in bridged mode to deliver that power? Is there anything negative about doing this? Has anyone done this? Heres a diagram of what im thinking about doing. Ive tried fining my answers through google but cant seem to find this particular case for some odd reason..

so i want to amp my system -- posted image.

A little insanity never hurt anyone

xancilleryx

Member - Posts: 5

Joined: September 14, 2010

Location: Nevada, United States

Posted: September 14, 2010 at 4:43 AM / IP Logged

Guess I forgot to mention a few details:

2008 Nissan Titan XE

CDT Audio CL-62 Components for the fronts

CDT Audio CL-6EX Coaxial For the rears

A little insanity never hurt anyone

xancilleryx

Member - Posts: 5

Joined: September 14, 2010

Location: Nevada, United States

Posted: September 14, 2010 at 11:32 PM / IP Logged

Someone? Anyone? Nobody? Ouch so i want to amp my system -- posted image.

A little insanity never hurt anyone

Thack79

Silver - Posts: 526

Joined: December 02, 2003

Location: Virginia, United States

Posted: September 15, 2010 at 8:54 AM / IP Logged

cute diagram

ben d.

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Joined: June 08, 2008

Location: Pennsylvania, United States

Posted: September 15, 2010 at 1:07 PM / IP Logged

according to the model of speakers you gave they are 4 ohm speakers. When you bridge the amplifier channels the resistance at the amp will drop to two ohms. You will have to find an amp that is stable bridged at that resistance. Otherwise the amp will overheat/fail or just sit in protect mode. But other than that you can do it. Keep in mind you don't need to feed those speakers the RMS rating of power but if you want to you will have to spend money. 5-600 bucks for a two channel amp pushing that kind of power isn't a bad price. Generally good amplifiers you will be paying 1-2 dollars per rms watt. Decent rule of thumb to go buy when shopping for amplifiers.

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haemphyst

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Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: September 15, 2010 at 5:13 PM / IP Logged

I do it every day. I have a PDX4.150 bridged to my mid-bass in my doors. Potentially overpowered? Indeed, but I know the limits of my gear, and I never get that far into it.

Go for it. It'll work like a champ!

ben d. You are wrong. If you bridge a 4-ohm speaker to any amp, you still have a 4-ohm load. If the amp is stable bridged into a 4-ohm load, he'll be perfectly safe. Yes, the amplifer "effectively sees" 2-ohms per channel, but that's because the current output doubles, the voltage is doubled across the SAME 4-ohm load, creating four times the power. It is the doubling of current that makes the amplifier "feel" like it's making more power, or driving a lower impedance. It's still powering a 4-ohm load.

I realize that's in a perfect world, and it's per Ohm's Law, but I think this is what you have in mind. Regardless, the total impedance attached to the amplifer is 4-ohms. Speakers don't simply change their impedance.

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

xancilleryx

Member - Posts: 5

Joined: September 14, 2010

Location: Nevada, United States

Posted: September 15, 2010 at 6:11 PM / IP Logged

Thack79 wrote:

cute diagram

Haha thanks... I figured someone would like it :P

haemphyst wrote:

I do it every day. I have a PDX4.150 bridged to my mid-bass in my doors. Potentially overpowered? Indeed, but I know the limits of my gear, and I never get that far into it.

Go for it. It'll work like a champ!

Perfect this is just the answer I was looking for. And yes im going to overpower them but im not going to blow them if I have my gains down. With a setup like this will i lose any L to R or front to back fading ability from the headunit? I dont see why I woulnt....I get asked why not just run a 4 channel with more power? Well damnet im on a budget, so why not try something like this? I also want to make shure my speakers have all the power thier built for and are ready for whatever I throw at them imo. I dont forsee myself blasting them up that loud for fear of going deaf, its just knowing I can. so i want to amp my system -- posted image. Thanks for the help guys!

A little insanity never hurt anyone

icearrow6

Copper - Posts: 497

Joined: February 02, 2009

Location: California, United States

Posted: September 15, 2010 at 6:40 PM / IP Logged

Diagram reminded me of the Styrofoam cup telephones. lol

Yeah as stated above everything should be good.

One thing to keep track of the Channel separation. Since its a 4 channel amp. Make sure the channels you are bridging are on the same side.

Ie. channel 1+2 are both LEFT speaker.

and channels 3+4 are both RIGHT speakers.

soundnsecurity

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Joined: November 10, 2008

Location: Louisiana, United States

Posted: September 16, 2010 at 4:47 PM / IP Logged

you never posted which amps you have. they ARE the same amps aren't they? mis-matching amps would be the only problem i can see

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xancilleryx

Member - Posts: 5

Joined: September 14, 2010

Location: Nevada, United States

Posted: September 17, 2010 at 12:26 AM / IP Logged

Yep their both the same:

SPECS

x2 Jensen Power 760

RMS Power (4 ohms) 75 watts x 4 channels

RMS Power (2 ohms) 100 watts x 4 channels

RMS Power (1 ohm) N/A

Bridged RMS Power 190 watts x 2 channels

Total RMS Power Output 380 watts

Peak Power Output 380 watts x 2 channels

Total Peak Power Output 760 watts

Maximum Input Gauge Size 8

Minimum Impedance Unbridged 2 ohms

Minimum Impedance Bridged 4 ohms

THD at Rated RMS Power 1%

Speaker Level Inputs No

Preamp Outputs 1 pair

Built-in Crossover Low-pass (LP)

High-pass (HP)

Full (AP)

High-Pass Crossover Frequency 40 - 300 Hz

Low-Pass Crossover Frequency 40 - 300 Hz

Subsonic Filter N/A

Signal-to-Noise Ratio 100 dB

Channel Separation 60 dB

Bass Boost N/A

Bass/Gain Remote No

Fan Cooled No

Fuse Rating 20A x 2

CEA-2006 Compliant Yes

A little insanity never hurt anyone

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