Greetings,
Please make sure that your Vandersteen High Pass Batteries are A up to date and B soldered in only by a professional, C make sure that you nailed the proper adjustments with the internal hi pass dip switches. As the series of dip switches to be set correctly is vital for performance.Please don’t just read the manual as many are wrong and in need of the following.
Play Track 27 Vandertones 1000 HZ voltmeter into left channels amp speakers binding post. Adjust Volt meter to AC Volts next adjust pre amp volume controls to see meter read 1 Volt AC then go to track 30 adjust the dip switches untill the meter reads .707 volts start all over again from track 27 until you nail it anything else is wrong. please don't forget to adjust both high passes to proper setting.
I would bet heavy once this is done you will easily hear its advantages.
Best JohnnyR