Tap Into Your Factory Radio For a Clean, Well-Defined Sound

This Amplifier is Totally Cool

The M FOUR stays cool thanks to the highly efficient Class D design topology, allowing you to listen for many hours without overheating while it delivers up to 540 Watts of clean and undistorted output power.

Features:

• Integrated, Adjustable Crossover: highpass, lowpass, and bandpass
• Input Mode Switch makes for flexible input signal routing
• Automatic Turn-On Function
• Compact footprint
• High output power of 135 Watts RMS
• Intelligent high-level input makes for easy integration into factory Harley radios
  
• Surface Mounted Device manufacturing technology combines minimum space with maximum reliability
• Exclusive clean and efficient design

Specifications:

• Output Power RMS: 4 x 100W @4 Ohms; 4 x 100W @2 Ohms; 2 x 200W Bridged @4 Ohms
• Max Output Power/Channel: 135W RMS @2 Ohms
• Amplifier Technology: Class D
• Inputs: 4x RCA; 4x High-Level Speaker Input; 1x Remote In
• Input Sensitivity: RCA 0.5-6V; High Level 1.3-13V
• Input Impedance: RCA 20 kOhms; High Level 13 Ohms
• Outputs: 4x Speaker Output
• Frequency Response: 10 Hz-30,000 Hz
• Highpass: 15 Hz-4,000 Hz adj; Lowpass: 40 Hz-4,000 Hz adj; Bandpass: 15 Hz-4,000 Hz adj
• Slope High/Lowpass: 12 dB/Oct
• Signal-to-Noise Ratio: 98 dB
• Distortion (THD): 0.05 %
• Damping Factor: 100
• Operating Voltage: 10.5-16V (Max. 5 sec. down to 6V)
• Fuse: 2 x 30A Maxi-fuse (APX)
  
• Dimensions: 2.00" H x 9.06" W x 6.06” D

Items built to order have a build time of up to two weeks before shipping. Items that are not built to order (e.g. amplifiers, speakers, .etc) typically ship in 2 - 3 business days. Many of our speaker kits feature machined special parts and customized wire harnesses that are built to order. We process and build orders in the order that we receive them. This allows our experts to go over every order and check that your particular order is correct for your particular bike. This means sometimes you have to wait a little longer to get your order but it's always worth it! 

Once You Order Does Ship

You will receive an automated email with tracking information as soon as our shipping department creates a shipping label for your package.  

Please allow 10 business days for your order to arrive if it is an item that is built to order. Items that are not built to order (e.g. amplifiers, speakers, .etc) typically ship the next business day.We process and build orders in the order that we receive them. This allows our experts to go over every order and check that your particular order is correct for your particular bike. This means sometimes you have to wait a little longer to get your order but it's always worth it! 

Returns are easy, simply contact us for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap! You can find our refund policy here.

Returns are easy, simply contact us for a return Authorization number and send your item to our returns center for fast processing. We'll get you a replacement or refund in a snap! You can find our refund policy here.

Your part is guaranteed to fit. We test fit every part we sell on actual bikes in order to verify fitment on each model, generation, and in each possible location. You can be sure that if we have stated that a part fits your bike, that it will, or your money back. You will find model, year, and location fitment details on most product pages.

Ordering from American Hard Bag is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either.

We Thoroughly Test Every Part We Sell on a Real Bike. There are a lot of parts out there that we refuse to sell. If it’s not up to our high standards, it never makes it to this website. We have parts that fit various budgets and levels of insanity, but all parts we carry are exceptional performers.

Because We Are Fully Authorized Retailers for All Brands We Sell, Manufacturers Warranties Are 100% Valid. There are only a select few authorized online retailers for the brands that we sell. Most all online retailers (even the really big ones) are not authorized at all! And the manufacturer's warranty is void before you even get your items.