I installed a new stereo head unit last night into my '92 525.

Using Crutchfield, I was advised to connect the head unit to an adapter, PAC OEM2, then to the BMW wiring harness, then to the factory wiring.

All works okay, though it was a tight fit getting everything inside. The only problem now is that the volume is not very loud at all.

Anyone have any ideas? The rest of the system is stock (speakers and amp.). The factory head unit that I removed could produce a lot more sound. With the new head unit turned up so I can hear music over the highway traffic, the system sounds like it's straining to produce the highs and lows.

Any ideas and thoughts would be appreciated. Thanks.