Any cables that give more bass

why does everyone think cables make such a big difference?

First, you do need a subwoofer that crosses over at 80hz or below and goes down to at least 25hz. Then you need to equalize your bass because unless your room is acoustically perfect, you will have frequencies that are much too loud and others that get lost completely. These changes will make a BIG difference. You can eq your subwoofer with some free software (REW), a $40 Radio Shack sound level meter..and then an EQ that you can buy for $60 or so on EBAY. This will make a FAR bigger and actually audible difference in your system.

Forget about expensive interconnects, speaker cables, special power cables or "clean power" filters....get the basics right first.

There are many tweaks...most that you, frankly, won't even hear but you'll feel good because you spent the money...but they are way down the road.

that's not a problem....many subs have line level inputs...you wire your left and right amp outputs thru the sub and then the crossover in the sub feeds the non supb output to your speakers.

Why would a ps audio dliii improve the bass response of his KEF's that only go down to 55hz????? Why would Analysis Plus Oval 9's improve bass response that the speakers can't produce (flatly at any volumne)?

Reference 203 specifications
Design 4 way reflex
Drive units LF: 2 x 165 mm (6 1/2”)
MF: 1 x 165 mm (6 1/2”)
HF: 1 x 25 mm (1”)
SHF: 1 x 19 mm (3/4”)
Frequency response at 15°
horizontally off axis ±3 dB 55 Hz - 55 kHz
LF Corner -6 dB 40 Hz
Crossover frequencies 400Hz, 2.7 kHz, 15 kHz
Amplifier requirements 50 - 200 W
Sensitivity (2.83V/1m) 89 dB
Maximum output 113 dB

If the OP wants to hear punchy bass, the bass line, low organ notes or the tank rumbling into town in Saving Private Ryan...the OP needs a sub-woofer.

I can't believe all you folks suggesting power cords and such......the OP needs a sub and probably some room modification or EQ.

Let's get out of the "audio god" cloud....and lets help him really solve his problem.

Then he can throw any amount you want him to spend on cables, equipment stands, independent A/D converters and so on.

What is wrong with running your speaker wires thru a crossover, prior to the signal getting to your mains? That's what a number of subs have integrated in....they can either take an RCA direct input, if your pre has sub outputs, or you can connect your speaker wires and then run your speaker wires from a different set of terminals (crossover hi output). Sunfire subs do this...many others also.