It's been years since I fiddled with one of these.
I STRONGLY recommend that all of you (who haven't yet) use this EQ menu and adjust your radio.
It will make it sound like a new radio!
The factory settings have WAY too much bass, especially the rear speakers and the mid front adjustment.
After all the adjustments the muddled sound is gone, replaced by a nice crisp sound and this is just a base 613 with no subwoofer. Vocals are now great :thumbup:.
This takes all of 3 minutes and the change is nothing short of amazing!
Please note the "803" link above also works with a 613
The newer radios (05-07) are better radios but have so much default treble.....very 'brassy" sound
Why would they not have this EQ is a total mystery!!!
They sound very good with the optional factory subwoofer in V70s, but if you have an S60, you're sort of screwed unless you install a custom sub
If you read the hidden menu that was posted avove you would see what the factory defaults are
Some settings are 0, some are 4s etc
Ive been sitting in my car for over an hour now messing with the setting! I didnt think volvos had the hidden eq, this was the first thing I did on all my audi's and now after owning my v70 for a year it really is like a new radio.