Over the weekend I finished the installation of my new AMP (Cerwin-Vega B2) to compliment the JBL GTO638 speakers that I installed the first week I bought the bike.
All I can say is Wow. AMP install was ALOT of hard work, especially fitment in the shark nose, but it was well worth it.
AMP gain was set using a digital multimeter and the crossover frequency set by ear. The GTO638 speakers don't really play well with frequencies below 100hz at high power input and high volume. My input voltage to the speakers is approximately 31.62v and crossover is set at 120Hz (best guess).
This allows for almost uncomfortable volume levels when the bike is running.
The GTO638 speakers are rated 50Hz-21,000Hz at 60W RMS and that is probably a pretty fair and accurate rating. Just be advised that if you want high volume when jamming down the highway at 80mph you will probably want to set your crossover frequency somewhere above 80Hz minimum.
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