Quote:
Originally Posted by Sam Kapasi 
The GTO1004 has a difficult responsibility on its shoulders. This is the amplifier that replaces the legendary GTO75.4. One fantastic new feature in the 1004 is the inclusion of a LP/HP and BP(Band pass) filter. The band pass filter will allow you to electronically connect a 2 way or 3 way active system, using the electronic crossovers on the amplifier.
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Fantastic! Now GTO1004 looks like a
better option. Inclusion of BP for speakers is great!
And, having an output of 150W X 4 @ 2ohms means it is as good as a monoblock for the sub.
I just saw pictures of 504 and understandably, it doesn't have BP:
