Reply to thread

Message

<blockquote data-quote="AZsound" data-source="post: 5686232" data-attributes="member: 559554">Rated Power Output (CEA-2006)On May 28, 2003, the Consumer Electronics Association published standard CEA-2006, &quot;Testing &amp;amp; Measurement Methods for Mobile Audio Amplifiers.&quot; This &quot;voluntary&quot; standard advocates a uniform method for determining an amplifier&#039;s RMS power and signal-to-noise ratio. Using 14.4 volts, RMS watts are measured into a 4-ohm impedance load at 1 percent Total Harmonic Distortion (THD) plus noise, at a frequency range (for general purpose amplifiers) of 20 Hz to 20,000 Hz. Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. This applies to both external amplifiers and the amplifiers within in-dash receivers.So there is no any CEA standarts for 2 ohm load or 1 Ohm load. So, Kenwood KAC-9104d does over 500Wt at 4 Ohm according to CEA-2006 standart. Kenwood has a right to publish any numbers how many watts it&#039;s does at 2 or 1 Ohm, even if it doesn&#039;t. Just few lines from specifications.Amplifier-Specifications (manufacturer spec.)Maximum Power Output (4Ω)&nbsp; &nbsp; 1800W x 1Rated Power Output (4Ω, 14,4V)&nbsp; &nbsp; 500W x 1 (20Hz ~ 200Hz, 0.5%THD)Rated Power Output (2Ω, 14,4V)&nbsp; &nbsp; 900W x 1 (100Hz, 1.1%THD)Rated Power Output (1Ω, 14,4V)&nbsp; &nbsp; 900W x 1 (100Hz, 1%THD)Rated Power Output (CEA-2006)&nbsp; &nbsp; 500Watts RMS x 1 at 4 ohms and 1% THDLow-pass Filter&nbsp; &nbsp; 50~200Hz (24dB/oct)(B-Channel)Bass Boost Circuit&nbsp; &nbsp; 0~18dB (Variable)Bass Boost Frequency&nbsp; &nbsp; 40HzInfrasonic filter&nbsp; &nbsp; 15/25Hz (18dB/oct)Input Sensitivity&nbsp; &nbsp; 0.2 ~ 5VInput Impedance&nbsp; &nbsp; 10kΩSignal to Noise Ratio&nbsp; &nbsp; 100dBSignal To Noise Ratio (CEA-2006)&nbsp; &nbsp; 75dBa (Reference: 1 Watt into 4 Ohms)Frequency response (+0dB, -3dB)&nbsp; &nbsp; 5Hz ~ 200HzOperating voltage&nbsp; &nbsp; 14.4V (11V ～ 16V allowable)Dimensions (WxHxD)&nbsp; &nbsp; 350 x 59 x 238(mm),Weight&nbsp; &nbsp; 3.4kgCurrent Consumption&nbsp; &nbsp; 55A<a href="http://www.caraudiomag.com/reviews/caep_0811_kenwood_kac_9104d_review/output_power_distortion_etc.html" target="_blank">http://www.caraudiomag.com/reviews/caep_0811_kenwood_kac_9104d_review/output_power_distortion_etc.html</a></blockquote>

[QUOTE="AZsound, post: 5686232, member: 559554"] Rated Power Output (CEA-2006) On May 28, 2003, the Consumer Electronics Association published standard CEA-2006, "Testing & Measurement Methods for Mobile Audio Amplifiers." This "voluntary" standard advocates a uniform method for determining an amplifier's RMS power and signal-to-noise ratio. Using 14.4 volts, RMS watts are measured into a 4-ohm impedance load at 1 percent Total Harmonic Distortion (THD) plus noise, at a frequency range (for general purpose amplifiers) of 20 Hz to 20,000 Hz. Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. This applies to both external amplifiers and the amplifiers within in-dash receivers. So there is no any CEA standarts for 2 ohm load or 1 Ohm load. So, Kenwood KAC-9104d does over 500Wt at 4 Ohm according to CEA-2006 standart. Kenwood has a right to publish any numbers how many watts it's does at 2 or 1 Ohm, even if it doesn't. Just few lines from specifications. Amplifier-Specifications (manufacturer spec.) Maximum Power Output (4Ω) 1800W x 1 Rated Power Output (4Ω, 14,4V) 500W x 1 (20Hz ~ 200Hz, 0.5%THD) Rated Power Output (2Ω, 14,4V) 900W x 1 (100Hz, 1.1%THD) Rated Power Output (1Ω, 14,4V) 900W x 1 (100Hz, 1%THD) [B]Rated Power Output (CEA-2006)[/B] [B]500Watts RMS x 1 at 4 ohms and 1% THD[/B] Low-pass Filter 50~200Hz (24dB/oct)(B-Channel) Bass Boost Circuit 0~18dB (Variable) Bass Boost Frequency 40Hz Infrasonic filter 15/25Hz (18dB/oct) Input Sensitivity 0.2 ~ 5V Input Impedance 10kΩ Signal to Noise Ratio 100dB Signal To Noise Ratio (CEA-2006) 75dBa (Reference: 1 Watt into 4 Ohms) Frequency response (+0dB, -3dB) 5Hz ~ 200Hz Operating voltage 14.4V (11V ～ 16V allowable) Dimensions (WxHxD) 350 x 59 x 238(mm), Weight 3.4kg Current Consumption 55A [URL="http://www.caraudiomag.com/reviews/caep_0811_kenwood_kac_9104d_review/output_power_distortion_etc.html"]http://www.caraudiomag.com/reviews/caep_0811_kenwood_kac_9104d_review/output_power_distortion_etc.html[/URL] [/QUOTE]

Verification