I just got a Zumo 665 and when I play the xm radio it's not load enough at highway speeds. I have a 550 and had no problem. Well my question is which is the cheapest plug and play amp to boost my volume. I already have j&m speakers

 

Is there a volume control in the Zumo to adjust the level on the GPS and XM? My 550 has it

 

I found volume control in two places in the 665 but I still have to put radio up to full volume and normally half is good enough.

 

Try this. Let me know how it works because I'm thinking about getting one too. You can be my Guinea Pig

 

JPALM:
Looks like that could be a good solution for cleaning up and boosting the audio, but in looking at the pic it seems the plug for the helmut headset is a different type??

 

You might want to look on www.zumoforums.com. There might be a solution for you there.

Good luck.

 

Boostaroo works - back in the day when I had just a windshield setup and there wern't many options, I coupled an earlier model Boostaroo with the old Cyclesounds speakers and ran the tunes from a MP3 palyer. Without the Boosteroo, you couldn't hear squat and it was not any kind of quality sound - doubled sound an quality with Boostaroo - downside is it's battery driven (or was - looks like they fixed that)

In the grand scheme of things, it's cheap and they frequently run programs like buy a Boosteroo and they will send one to a serviceman stationed somewhere

Just my experience - was around 2007 maybe?!?

 

Well we will find out I have a boostseroo on order

 

The boosteroo is coming monday. But I unproved my volume alot by turning off bluetooth

 

I got the boosteroo installed and it almost doubles volume. So far so good