amp upgrade?

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twobig86

Copper - Posts: 84

Joined: November 30, 2005

Posted: June 24, 2008 at 10:20 AM / IP Logged

I currently have a Clarion APX640.4 and looking at the stats I cant seem to figure out at which impedance it gives out the 80W x 4 RMS

I'd getting 4 JBL C608GTi - II Speakers and was thinking of upgrading to the JBL PX300.4 amplifier.

I dont really understand the whole 2 / 4 ohm options on the amplifiers...I assume that if you have 4 ohm speakers the amp will produce the 4 ohm stats?

Following are the stats of the speakers and the two amps. Could someone please post the wattage that I would be getting out of each amp playing these speakers? And maybe then recommend whether or not its worth the amp upgrade or not?

Speakers:

Component Systems

GTi Series

C608GTI MKII

SPECIFICATIONS

General

Power Handling, RMS 150 Watts

Power Handling, Peak 600 Watts

Frequency Response (±3dB) 50Hz - 21kHz

Sensitivity (2.83V @ 1m) 89dB

Impedance 4 Ohms

Crossover Frequency(ies) 3.5kHz, 24dB/oct

Mounting Depth 2-11/16" Woofer, 1-1/8" Tweeter

http://www.jbl.com/car/products/product_detail.aspx?prod=C608GTI%20MKII&Language=ENG&Country=US&Region=USA&cat=COS&ser=GTI

Clarion APX640.4

Maximum Power Output - 640

Continuous Power Output - 80x4

THD @Rated Output (%) - <.05%

Sound to Noise Ration (A wtg) - >110dB

Frequency Response (+/-1dB) - 10Hz-50kHz

Line Level Input Sensitivity - 200mV-8V

Speaker Level Input Sensitivity - 400mV to 16V

Input Impedance - Low Level - 12k Ohms

High Level - 395 Ohms

Output Impedance - 2 Ohms Stereo / 4 Ohms Bridged

Power Series

PX300.4

SPECIFICATIONS

General

Power Output 123,5W x 4 into 4 ohms

169W x 4 into 2 ohms

358W x 2 into 4 ohms, bridged

Max Power 600W Peak x 2

Signal-to-Noise Ratio >95dB

Total Harmonic Distortion 0.04%

Frequency Response 10Hz - 45kHz ±1dB

Built-in variable electronic crossover with selectable slope

Dynamic Bass Optimization™ (DBO) circuit

Preamp outputs

Differential inputs

Internal-lighting-ready

Direct-Connect

Dimensions (H x W x D) 312mm x 432mm x 66mm

http://www.jbl.com/car/products/product_detail.aspx?prod=PX300.4/230&Language=ENG&Country=GB&Region=EUROPE&cat=AMP&ser=POS

theterminator

Copper - Posts: 96

Joined: July 19, 2007

Posted: June 24, 2008 at 2:25 PM / IP Logged

Your final impedance load will depend on how many speakers, the impedance of each speaker and how you wire them. You should take a look at the new Arc Audio KS Minis. There amazingly small and provide ample power.

twobig86

Copper - Posts: 84

Joined: November 30, 2005

Posted: June 24, 2008 at 8:47 PM / IP Logged

so what would be the impedance of 4 - 4 ohm speakers like the ones above?

theterminator

Copper - Posts: 96

Joined: July 19, 2007

Posted: June 24, 2008 at 9:07 PM / IP Logged

Well if you ran each speaker to a seperate channel then the final impedance load would be 4 ohms for each speaker. So that means you would get what ever the rated output is x4 at 4 ohms.

twobig86

Copper - Posts: 84

Joined: November 30, 2005

Posted: June 26, 2008 at 1:45 PM / IP Logged

Ok but how about the Clarion amp when it says continuous power output of 80 x 4.

Im running one speaker per channel...4 ohm speakers...however it ways 2 Ohm stereo and 4 ohm bridged...so...my question is...with the clarion amp and those speakers how much wattage can I expect from each speaker?

Continuous Power Output - 80x4

Output Impedance - 2 Ohms Stereo / 4 Ohms Bridged

twobig86

Copper - Posts: 84

Joined: November 30, 2005

Posted: June 27, 2008 at 7:56 PM / IP Logged

i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 27, 2008 at 8:51 PM / IP Logged

Each channel of the amp will have a 4 ohm load on it. The 4 X 80 you are talking about, is that into 2 ohms or into 4. Whatever it is rated at into 4 ohm stereo, that is what you will have.

twobig86

Copper - Posts: 84

Joined: November 30, 2005

Posted: June 28, 2008 at 10:16 AM / IP Logged

See thats the problem that I am currently having...I cant find any other specs on the amp than what I have posted...I have a PDF file for the amp and it doesnt say anything other than what I posted...This is why I am confused...

it says

Output Impedance - 2 Ohms Stereo / 4 Ohms Bridged

does that mean that it only runs at 2 Ohms Stereo and to get 4 Ohms that the amp must be bridged...I have no idea...I dont even really know what Bridged means...

I am trying to figure out how much wattage I will get out of this amp with 4 - 4 ohm speakers...but my experience with amps is limited so im hoping someone here can help me out.

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 28, 2008 at 10:29 PM / IP Logged

That spec should say Minimum output impedance 2 ohm stereo or 4 ohm mono. You can realistically expect 80 watts per channel with all 4 channels driven into a 4 ohm load.

Bridging

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amp upgrade?

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