Currently Being ModeratedDec 29, 2011 12:53 PM (in response to guitargodkpy)Re: Spider IV 75: It's not as loud as it used to be
Have you tried a factory reset? Hold the 'A' button in while turning the power to the amp on and hold for another 5-10 seconds.
Note this will reset all the User Presets to the factory originals, so you will want to back those up by using Spider Edit.
Currently Being ModeratedDec 29, 2011 10:39 AM (in response to fflbrgst)Re: Spider IV 75: It's not as loud as it used to be
If the reset didn't help, then only a technician at an authorized service center can diagnose and repair this issue. They can be found at http://line6.com/service_centers/. It has a one year warranty; you'd provide a copy of your receipt to the service center for warranty service.