The JVC MX-J500 stereo set is something I’ve had for 20 years now. It has only two satellites, each with its own subwoofer and tweeter. No central speaker or standalone subswoofer.
amp section:
72 W per channel
AUX input sensitivity/impedance 420 mV/50 kohm
speakers impedance 6–16 ohm
speakers (two of them, no centre piece, no dedicated sub):
3-way bass reflex
woofer: 16 cm (6.5’’) cone (1)
mid: 5 cm (2’’) cone (1)
tweeeter: 2 cm (0.8’’) dome (1)
power handling capacity: 120 W
impedance: 6 ohm
frequency range: 45 Hz – 20 kHz
SPL: 86 dB/Wm
Helium 600:
This is a dedicated gaming set from a budget brand. One large sub — a little larger than each of the JVC’s satellites — and two small satellites. The satellites are just mid & tweeter. However, the mids and tweeters are each slightly larger than their counterparts on the JVC. The sub is just a sub. There is no central speaker.
(link: manufacturer’s product page, scroll down for specs)
sub RWS output: 30 W, and the sub is 30W also
sat RWS output: 30W (total), and the sats are 2x15W
frequency range: 40 Hz – 20 kHz
SPL: 88 dB
I wonder which one of them is better — or less bad, if you prefer. 
Since the properties are similar in way, I was thinking about using one of them as front and the other as
rear, what say ye? The Helium set doesn’t have EQ, but the JVC does, so I could perhaps get it so sound more similar to the Helium if I could somehow nail down what exactly to change (won’t able by ear, too untrained).
I have a SoundBlaster Z (not ZXR), which contains a CS4398-CZZ DAC and JRC 4556A speaker amp. Alternatively, I could use my older x-Fi Titanium (not HD).
Uses: Gaming, classical, ethnic, jazz, some rock or pop. No metal, rap or hip-hop. Other genres only really if they pop up in games.
Thank you. 