Are there any charging requirements for the ST400 or ST600 system? How many amps of power do these systems draw?
There are no specific charging requirements. These will work on any motorcycle or power sports application, even scooters and UTVs. The ST400 will draw about 15 amps of power and the ST600 about 25 amps.
does it have a radio feature?
It does not have a built in radio, but works with any audio device, with or without Bluetooth. Most audio devices then offer an FM radio option, whether it is a built in FM radio tuner or an app such as iHeartRadio.
If I buy a 2 speaker system and decide later I want 4 speakers, can they be added?
Yes, you will receive the same 4 channel amplifier with the 2-speaker system and can easily add on 2 additional speakers at any time.
Do you get a whole lot more sound from 4 speakers? Being that two of them would attach to mustache bars
You get an average of 15-20% more sound output with 4 speakers, plus a fuller, more surround sound experience
1st how hard to install?
2nd will they attach to 1 1/2 inch handlebars?
We design all our systems as self install kits. They only require mounting and a few wire connections. Installation can typically be completed in an hour or two. You can see a set of the instructions under the 'Product Specs' tab.... The speakers will attach to any 7/8" to 1-1/2" bar sizes.