The Z313 (model of the 2011 year) has a useful wired control pod with a headphone jack, while the Z323 (model of the 2009 year) isn’t complemented with such a feature. The Logitech Z323 vs Z313 comparison demonstrates that the Z313 doesn’t support the PlayStation/Xbox connection (unlike the Z323) and has lower subwoofer power (15W against 18W). The first model is suitable for those who prefer a comfortable control process, while the second one has high-quality sound and is compatible with most modern devices.
The Z323 speakers deliver sound in all directions, so I enjoy deep sound all around the room. The music is clear even with the volume up and there are no distortions. The Z313 also sounds good but when switching from the standard sound (from the built-in laptop or monitor speakers) to the Logitech Z313, something is wrong. The sound gains depth and low frequencies look quite decent, but most of the problems are about high tones, especially when listening at high volumes. The speakers begin to crackle and lose tone. It's an inconvenience that I can't control the intensity of the bass. It might be better to improve the situation by harmonizing low and high pitches via control (which is absent). Drawing the analogy between the Logitech Z313 vs Z323 while watching movies, there is no lack of high tones here, the subwoofer pleasantly emphasizes voices and sound effects.
The setup process is similar and all I have to do is connect the speakers to the subwoofer, plug-in power, and connect the control pod into the source. To compare: the Z313 starts a little faster than the Z323.
The Z323 system has a stylish modern look as the speakers’ panels are made of matte material and decorated with glossy details. The Z313 speakers are fully matte and no fingerprints are left on them (unlike the Z323 model). The Z323 vs Z313 comparison demonstrates the right speaker of the first system is complemented with a volume knob, while the Z313 speaker doesn’t have such an element — the system comes with the remote control, unlike the Z323. The Z313 has an RCA input and two 3.5mm inputs, which provide an easy connection to the Logitech Squeezebox network player, etc.
Regarding their dimensions of Z313 vs Z323, the speakers of the first system are smaller — 5.75 x 3.5 x 3.2 inches versus 5.75 x 3.5 x 3.2 inches and more lightweight — 1 pound versus 2.2 pounds. When talking about subwoofer sizes, they are almost similar — 9 x 8.66 x 6 inches vs 8.9 x 5.5 x 8.5 inches, but the basic difference is in weight: 5 pounds against 4.2 pounds