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Will these speakers fit on the handlebars of a 2016 Indian Chief Darkhorse?
Yes, your Darkhorse will have 1-1/4" stock handelbars and the systems include the correct 1-1/4" mounts (as well as spare 1" mounts).
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How many amps does the ST400 draw, on average operation
The ST400 amplifier will draw 10 amps of power on average, peaking at 15 amps.
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What are the dimensions of the speaker enclosures?
The speaker enclosures / housings measure 4.75" diameter by 3" depth.
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Will this fit easily on my 2016 Fatboy handlebars with a detachable batwing fairing?
Yes, these will fit great with a windshield or batwing fairing.  They can be mounted flush with the bars.
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Where does the amp get mounted?
The amplifier measures '5-11/16 X '1-3/4 X '3-7/8 inches and is typically mounted in a saddlebag, fork bag, windshield bag, swing arm bag, front down tube bag or side tool compartment.
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Is 10 amp draw constant? Is there a USB input? Can switched power source be a toggle switch? What is the measurement of handlebar clamp? Will I-pod touch work with system?
10 Amps is the peak draw. There is a USB port for charging only, but RCA inputs for a wired connection and Bluetooth for wireless connection. Switched power can be a toggle switch or connected to something that comes on and off with the bike (headlight, taillight, etc). The clamps will mount to a 1" or 1-1/4" bar diameter (other sizes also available). An iPod touch or any other audio device with a headphone jack or Bluetooth will work great.
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Any way to attach the 2nd set of speakers to the rear of the bike? like on the sissy bar for the passenger?
Yes, the 2nd set can be mounted just about anywhere, from highway bars and luggage racks to sissy bar/backrest or even in place of the rear foot pegs. They are universal and allow for a lot of different mounting options.
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Is it possible to add on 2 more speakers to this amp? I will mount the initial set-up on my handlebars and if I want to add 2 extra speakers later, is that possible?
Yes, this is the same amp that is included with the 4-speaker system for easy upgrading to 4-speakers at any time.
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What are the speaker specs?
• 400W Peak Wattage • 200W RMS Wattage • 4ohm Resistance • 2-Way Speaker Design • 4" Woofer • 1/2" Tweeter • 88dB sensitivity • 60-20k frequency range
