Hello, I purchased this radio yesterday, and so far it's great except for one small issue. I can't really hear it. My vehicle is a Jeep with mud tires and soft top, so it's quite loud going down the interstate at 75MPH. I purchased all the goodies with it (GPS, hand mic, etc.). If I hold the handmic by my ear at 32 volume (max) i can hear it fine, but thats tiring. I had a similar problem with my CB (required for off-roading), until i put an external amp. speaker on the rollbar by my head. Can I do that with this radio using the ear jack in conjunction with the handheld mic?