Grand Prix Audio's new Apex XL isolation footers reviewed by Alan Sircom in HiFi+:
"...what Apex does, it does well and it does universally."
"The goal of the Grand Prix Audio Apex is management
of spurious energy, whether that energy originates from within
the supported component, or is transmitted by the structure
that supports it. It completes this task admirably, showing far
more of what those components are doing by showing far
less of the contributions of the world beyond. Just beware
that its performance jump is addictive and it might not be the
last Grand Prix Audio component in your system. You have
been warned!"
Read the full review here.