Why Choose Crutchfield?
Great gear and expert advice
Our experts help you pick the ideal gear for your needs.Meet our advisors
Free tech support for the life of your gear.Read about our one-on-one expert help
You may return items that are complete and like new for any reason within 60 days.See the details of our return policy
Earn one point for every dollar you spend and use those points to save on future purchases.Get full details on Crutchfield Rewards
Deep discounts on car installation gear
We offer vehicle-specific installation instructions, dash kits, wiring harnesses, and speaker accessories at deeply discounted prices with car stereo and speaker purchases. Available for most vehicles.Learn more
Trusted since 1974
Our customers have trusted us with their business, and they’ve helped us win awards for our service.Check out our most recent awards
The manufacturer’s warranty always applies.See more details
4-channel car amplifier 85 watts RMS x 4
Item # 500PDRF50 | MFR # PDR-F50
Out of Stock
Ship date unknown
$399.99 Earn up to 400 Rewards points
Offers & Financing
Our take on the Alpine PDR-F50 by Crutchfield's Buck Pomerantz
Alpine managed to pack more power per square inch into their PDR-F50 4-channel Power Density Reference amplifier than almost any other amp in its class. The PDR-F50 can put out 85 watts RMS per channel, giving extra clarity and volume to your full-range speakers, and it'll fit in almost any of the tiny spaces you find in many cars and trucks these days. You can also use this versatile amp in 3-channel mode, driving your speakers with the front channels, and bridging the rear channels to send up to 250 watts RMS to your sub.
Alpine included the tone controls you'll need to fine-tune your system so your speakers sound their best. You can use the high-pass filters to remove the extreme low bass from your full-range speakers, so they'll play more efficiently. If you plan on running subwoofers with your PDR-F50, you can adjust the low-pass filters and bass boost to get just the right bass tone.
Superior sound and build quality
Alpine built the PDR-F50 to exacting physical and electronic standards, resulting in a tough, powerful amp with an incredibly clean and noise-free output. All the electrical connections are made on one side, for more convenient and neat installations. Speaker-level inputs allow you to use this amp in almost any system, even one with a factory radio. And you can rotate the badge, so the Alpine logo can always display right side up no matter which way you mount your PDR-F50.
PDR-F50 control panel exposed
Its a little pricey, but you get what you pay for. This amp is a little powerhouse and sounds super clean. The bass controlw only worth for channels 3 & 4 but thats all i need anyway.
Michael, Baltimore, MD
What's in the Box:
- 4-Channel class-D amplifier
- Two 30-amp ATO fuses (installed)
- Four 3/4" Self-tapping screws
- 3mm Allen wrench
- 2mm Allen wrench
- Alpine logo plate
- Owner's manual (English/ French/ Spanish)
- Verification certificate
- Warranty information
- On-line registration information
- 4-channel car amplifier
- 85 watts RMS x 4 at 4 ohms (125 watts RMS x 4 at 2 ohms)
- 250 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
- CEA-2006 compliant
- separate variable high- and low-pass filters (50-400 Hz, 12 dB/octave) on front and rear channels
- selectable bass boost (0, 6, or 12 dB at 50 Hz) on rear channels
- preamp and speaker-level inputs
- speaker-level inputs require RCA adapter cables
- Class-D amplifier design
- MOSFET power and output stages
- fuse rating: 30A x 2
- 4-gauge power and ground leads recommended wiring and hardware not included with amplifier
- 9"W x 2-1/16"H x 7-1/8"D
- warranty: 1 year
- Our 60-day money-back guarantee
Alpine PDR-F50 Reviews
Average Customer Review(s):
Thanks for submitting your review
Features and Specs
|RMS Power Output (Watts x Channels)||
85 x 4
|Peak Power Output (Watts x Channels)||N/A|
|Power at 2 Ohms (Watts x Channels)||125 x 4|
|Bridged Power (Watts x Channels)||250 x 2|
|Minimum Impedance Bridged||4|
|Minimum Impedance Unbridged||2|
|Best Frequency Response||8-45k Hz|
|THD at Rated RMS Power||1%|
|Signal to Noise Ratio||87 dB|
|Low-Pass Crossover Frequency||50-400 Hz|
|Low-Pass Slope (dB/octave)||12 dB/octave|
|High-Pass Crossover Frequency||50-400 Hz|
|High-Pass Slope (dB/octave)||12 dB/octave|
|Bass Boost||0, 6, 12 dB|
|Bass Boost Frequency||50 Hz|
|Speaker Level Inputs||RCA|
|Parts Warranty||1 Year|
|Labor Warranty||1 Year|
Channel Design: The Alpine PDR-F50 can be configured as a 4-channel, 3-channel, or 2-channel amplifier. The amplifier is stable to 2-ohms in stereo, 4-ohms when bridged.
CEA-2006 Compliant: CEA-2006 is a system of testing and measurement for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured into a 4Ω load, with 1% or less Total Harmonic Distortion plus noise (THD+N), and over a frequency range of 20 Hz to 20 kHz (for full range amplifiers). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4Ω. CEA-2006 standards allow consumers to compare car amplifiers and receivers under the same conditions (apples to apples). Using CEA-2006 criteria, the Alpine PDR-F50 is rated at 85 watts RMS x 4 channels with an 87 dBA signal to noise ratio. The signal to noise ratio at the rated power output (not CEA-2006 conditions) is 106 dB.
LED: The top mounted LED Power indicator glows blue when the amplifier is turned on and changes to red when the protection circuit is engaged.
Auto Turn-on: When using a speaker level input, the amp will turn on automatically when it senses the input signal.
Verification Certificate: The amplifier comes with a certificate that lists the RMS power output of the specific amplifier. It also lists the model number, serial number, test date, and the test conditions (14.4 volts, 2 ohms).
Hidden Controls: The amplifier's controls are hidden under a cover plate. The plate is removed by unscrewing two machine screws with the supplied 2mm Allen wrench.
Gain control: There are independent rotary gain controls for the channel-1/2 and channel-3/4 amplifier sections. The gain settings are continuously variable from 0.2 to 4.0 volts.
Crossover: The amp has independent crossover mode and frequency controls for channels-1/2 and 3/4:
- Mode: choose off (crossover is bypassed), high pass, or low pass
- Frequency: rotary dial; 50-400 Hz
Input: The two position input switch configures the inputs:
- 1/2: only inputs 1/2 are used, and are shorted to channels 3/4
- 3/4: all four RCA inputs are used
Bass Boost: The bass boost circuit provides +6 dB or +12 dB signal boost centered at 50 Hz to channels-3/4. The bass boost can also be turned off.
Terminal Layout: For wiring convenience, all of the inputs and outputs on the amplifier are on one side.
Power Input: Two set-screw terminals are provided for connecting the power and ground cables. The terminals accept up to 4-gauge wire (a 4-gauge wiring kit is recommended). The set screws are tightened/loosened with the included 3mm Allen wrench.
Remote Turn-on: The remote turn-on set screw terminal will accept up to 12-gauge wire. The set screw is tightened/loosened with the included 2mm Allen wrench.
Speaker Outputs: The four pair of speaker outputs set-screw terminals will accept up to 12-gauge wire. The set screws are tightened/loosened with the included 2mm Allen wrench.
Signal Input: The Alpine PDR-F50 is equipped with two pair of female RCA jack inputs; Channel-1/2 and Channel-3/4. The RCA inputs will accept either speaker-level or line level signals from your car's head unit. A speaker level signal is connected to the RCA inputs using a speaker wire to RCA adapter (sold separately).
Fuses: The amp is protected with two 30-amp ATO fuses.
Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.
2 questions already asked
The Alpine PDR-F50 is a full-range (20Hz-20kHz) amplifier--it has separate, variable high- and low-pass filters (50-400 Hz, 12 dB/octave) on the front and rear channels; as well as a selectable bass boost (0, 6, or 12 dB at 50 Hz) applied to the rear channels only. If you would like to discuss in further detail, feel free to contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Larry May 02, 2017 ] Staff
This amplifier does feature both the speaker level input and signal sensing turn-on so you can add it to a factory stereo by using some speaker wire to RCA adapters: http://www.crutchfield.com/p_206KISL/item.html You'll still need to provide power from the battery & ground to the chassis. We recommend using 4 gauge wire for this amplifier. I hope that helps! My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5 [ Ryan Mar 30, 2016 ] Staff