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just bought a rockville rxd-m4 amp


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how much distortion does it put out at rated? thats a more important factor.

If it did it on the dyno it would be less than 1%.

Still doesn't dictate quality.

That being said a lot of people's definition of "music" is a clipped 30 hz sine wave with some 80 IQ knuckle head grunting about committing crimes and his genitals.

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Cert 1ohm 1267w 14.17vdc

Uncert 1ohm 1546w 13.73vdc

Dynamic 1ohm 2120w 14.81vdc

Those were the numbers off the steve meade amp dyno from the youtube video


Over the years, the technology used to create audio amplifiers has grown by leaps and bounds. We consider it our mission to use our expertise in developing the latest technologies and to bring you the absolute best sounding amplifiers on the market and of course at a reasonable price. From its clean, sleek design to its high quality components, you will be amazed at the quality and power that these new Phenom amps offer.

The RXD-M4 is a class D monoblock high power amplifier with 6,000 watts peak output, 3,000 watts RMS output and 1500 watts CEA-2006 rated power. It is CEA-2006 compliant which makes it easy to compare this amplifier to other CEA compliant amps on the market. The issue the car audio world is facing today is that there are so many different brands with different standards on how they rate their products. Here at Rockville we offer the best value in car audio. We therefore want to make it easy for you to compare our products to any brands on the market. So we provided 3 ratings for all our car amplifiers. We provided a CEA compliant rating, which you should use to compare this amplifier to other premium brands that make CEA compliant products such as Kicker, Rockford Fosgate, Kenwood, Pioneer, etc. We also supplied an RMS rating that Is not CEA compliant but has become standard in the industry. You should use this rating when comparing with ratings from brands such as Hifonics, Earthquake, DB Drive, etc. Lastly, we also supply a peak rating which almost all brands In the industry provide. This peak power is the amount of power the amp puts out at the loudest moments during a particular song.

One of the tricks to determine the real power of a car amplifier is to multiply the fuse rating by 10 to determine the true RMS power. This formula almost always works within 20 %. RXD-M4 features a 200 Amp External In-Line ANL Fuse Block. Compare this to other amps on the market with similar fuse ratings and youll see that with the RXD-M4 you are getting your moneys worth and then some.

This unit also features a high speed MOSFET power supply and studio-grade bipolar output stage transistors. It has a fully adjustable 12dB/Octave cross over with differential circuitry. Other features include a subsonic filter, a fully adjustable bass equalizer, mute and delay soft start technology, a phase control switch, and a dashboard subwoofer control for added convenience. The RXD-M4 is protected by a full IC controlled circuit and has professional peak limiter circuitry guaranteeing distortion free musical playback at all levels.

The RXD mono amplifiers took years of engineering. A lot of new technology went into these amps. We call this technology optical coupler Class-D. This new technology gives the amplifier punchier bass compared with a typical class D amp. A major difference in our OC technology is the preamp input stage and output stage are separated in circuitry. It is less susceptible to noise, which typically is picked up from the preamp input. The RCA input accepts both balanced and un-balance inputs. If there is potential inference in the car, the balanced input signal is less susceptible to noise.

The Phenom amps by Rockville use only the top parts. We use Siemens correction capacitors which are well-known for producing crystal clear sound quality. We use TL072 OP (power supply) which is composed of mosfets. Typical class D amps use JRC4558, which is composed of transistors only. Mosfet power supplies have a higher speed, lower loss rate, lower noise, and ultimately supply more efficient and clean power along with lower THD (distortion). We redesigned the layout of the PCB boards to allow the amp to run smooth and cool. Each and everything amplifier we manufacture is tested twice. Once at the semi-finished PCB stage of production and then another test is done at the final assembly. We also run age tests on them. After this is all done, we hire a 3rd party independent company unaffiliated with our factory or with us to go to the factory and do random inspections of the power and over 20 other tests. We guarantee these amps will satisfy you. We are so confident in your satisfaction of this amplifier that we will offer you a 90 day money back guarantee. This means if for any reason you want to return the amplifier back and get a full refund we will send you a label and take the amp back and give you all your money back. (Amp must be complete along with the box)

Rockville RXD-M4 6000 Watt/3000w Mono Class D 1 Ohm Car Stereo Amplifier With Optical Coupler Technology

CEA Compliant Power Ratings (Rated at less than 1 % distortion) (Use these CEA ratings when matching and comparing with other CEA compliant brands such as Kicker, Rockford Fosgate, etc)

1 Ohm: 1500 Watts x 1 Channel <1% THD+N

2 Ohm: 1000 Watts x 1 Channel <1% THD+N

4 Ohm: 750 Watts x 1 Channel <1% THD+N)

RMS Power Ratings: (Use these RMS ratings when comparing with great brands such as Hifonics, Earthquake, Soundstream, etc)

1 Ohm: 3000 Watts x 1 Channel

2 Ohm: 2000 Watts x 1 Channel

4 Ohm: 1500 Watts x 1 Channel

Peak: (The amount of power the amplifier can produce for a split second at the loudest part of a song

1 Ohm: 6000 Watts x 1 Channel

2 Ohm: 4000 Watts x 1 Channel

4 Ohm: 3000 Watts x 1 Channel

Strappable - This amp can be bridged together with another amplifier to deliver twice the power

High-Speed MOSFET Power Supply

Optical Coupler Class D Technology

Studio-Grade Bipolar Output Stage Transistors

Now exclusively with Professional Peak Limiter Circuitry which guarantees distortion free musical playback at all levels.

Fully Adjustable 12dB / Octave Crossover with Differential Circuitry

Low Pass Filter: 50Hz - 250Hz

Subsonic Filter: 15Hz - 55Hz

Phase Control Switch

Full IC-Controlled Protection Circuitry

Remote Dashboard Subwoofer Control

Fully Adjustable 12dB Bass Equalizer

Mute and Delay Soft Start System

RCA Preamp Line Output

8 Volt Preamp Circuitry

Status Mode LED Indicator

Minimum THD at Rated Power: < 0.05%

S / N Ratio: > 100dB

Frequency Response: 10Hz - 500Hz

Damping Factor: > 220 @ 100Hz

200 Amp External In-Line ANL Fuse Block

Dimensions: (W x H x L) 8.5˝ x 1.8˝ x 17.7˝

Not bad in my opinion for $149 shipped to my door

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CEA rating means the amp must make rated power at 4ohm with 14.4 volts at 1% THD or less.

CEA ratings do not apply to 2 ohm or 1 ohm operations, any other impedances are not included in CEA testing..

CEA ratings also do not apply on tests over 1% THD, so an amp being tested at clipping or dynamically can not be used to verify if an amp meets CEA testing guidelines since both of those are not done at 1% or less THD.

It is vary possible for an amp to pass CEA tests at 4ohms, but not so much 1ohm.

Same goes for Hifonics, they can pass the CEA tests, but yet fail to do their wattage claims at 1ohm and even sometimes 2ohms.

So to recap to testing an amplifier under the CEA rules.

Amp must be tested at 4ohms

Amp must not exceed 1% THD

Amp must not require more than 14.4 volts
Amp must do manufactures claimed power following the 3 above rules.

So if your buying an amplifier because it is CEA rated and are not planing on using said amp at 4ohms then the cea certified is meaningless since most people will be buying an amp to run it at its lowest stable impedance for the most power.



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