This series of end stages has got everything to get the pulse of car hi fi fans racing top technology and a classy look in the trendy colour of red together with highly convenient features all end stages possess a bass boost and adjustable low and high pass filter lpf 50 250 hz and hpf 80 2 khzthe mosfet power pack is thermally secured and short circuit proof if you are looking for a end stage with extremely good price performance ratio then you are well advised with the rave land mod