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I’m curious how the volume is controlled on the ST200? I can stream off my iPhone but can’t pull it out every time I want to change tracks, volume etc. I would really like an honest comparison between st200 and the st400 ???
The default volume control on the ST200 is to use your audio device directly. A lot of folks will use a handlebar mount to access it easier, however, we recommend one of our Bluetooth controllers. With either of these, you can control the phone without having to pull it out. Everything is conveniently controlled on the handlebars with the controller... As far as an ST200 to ST400 comparison, the ST400 is a significant jump up from the ST200. It will give you about 3x the output plus has some added features. The ST400 to ST600 is not as much of a jump. The ST200, however, is great for custom choppers and bikes with extremely limited space, as the amp is not much larger than a deck of cards.
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Will the ST200 or ST400 models fit a 2005 triumph rocket III?
The ST200, ST400 or ST600 will fit nicely on the handlebars of your Triumph Rocket III. We've done a few installs on them and they look and sound great!
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What speed volume control app do you guys use , I have an I phone
We recommend the basic and simple iOS app called "Volume by Velocity".
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I HAVE AN ADAPTER THAT PLUGS INTO MY TRICKLE CHARGER PLUG ON MY BIKE ... IS THAT AN OK SOURCE FOR POWER?
Yes, that would work just fine for the positive connection (+), as it is still a direct connection to the battery.
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I have a 2018 Harley Fatboy; is there a way to plug these into a power source other than a direct connection to the battery ? Also will they fit my handle bars ?
These motorcycle speaker systems are designed to connect directly to battery for the positive connection (12V+).  However, you could tap in to a power line elsewhere on the bike as long as it provides the same amount of power.  The ground can connect directly to the frame and does not need to connect directly to battery.  The systems will include mounting hardware for 1" and 1-1/4" bars.  We have 7/8", 1-1/8" and 1-1/2" available (free upon request).
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What kind of radio can I use?
You can use any radio or audio device with a standard headphone jack or Bluetooth.
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Can I hook this amp to my accessory connector on my '14 Road King?
Yes, this is a popular option... The connection plug is under the seat in front of the battery, it's capped. It is only hot when the ignition is on as well as the accessory switch. There is another under there that is always hot but it doesn't have a switch. H-D® can sell you the correct plug end to plug into either of them.
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Where does the amp mount?
The amplifier on the ST200 system is small, measuring only 1.5" x 2.5" x 4". It can typically be installed under the seat or a side tool compartment. A small bag is also an option (Fork bag, windshield bag, front down tube bag, swing arm bag, etc)
