I've been trying out various speakers for my Macs and have concluded some information that may be of interest.
The four 2.1 speaker systems that I have sampled range from $40 to $100.
These are:
Labtec Pulse 420 -------- $40
Logitech Z-340 ---------- $50
Altec Lansing ATP3 ------ $80
Creative I-Trigue 3300 - $100
Labtec Pulse 420 - $40
The Labtec Pulse 420 is a budget system and shows it in it's sound quality and looks. Not as handsome as other systems that cost more. The sound is okay, highs are good, mids are a bit low, but the bass (lows) is weak and if the volume is turned up a little to high the sub will distort. Also, the power supply is not built-in to the enclosure. Still an okay set if you don't mind the cheesey looks and need a budget set of speakers.
Logitech Z-340 - $50
The Logitech Z-340 is a step up from the Pulse 420's. It's looks are a lot nicer, much more modern looking. Sound quality is really good for the price. Crisp highs, a bit weak in the mid areas and the 6.5" sub performs admirably at regular to mid high volumes, if turned up to high the sub will start to distort. The power supply on this model is built-in, which is a plus. Over all these are nice sounding speakers for the money.
Altec Lansing ATP3 - $80
The Altec Lansing ATP3 is my pick out of the four as the best system. It's slimline design with big sound will fit in small spaces. They are very stylish and they sport an interesting design that gives it something that the other systems don't. Each ATP3 satellites are equiped with two 1" tweeter drivers and in the base of the satellites is a downfiring 3" midrange driver that delivers a very real and full sound at all volumes. The 6.5" sub is a little weak in wattage, but makes up for it in tight lows that is controllable from distortion with the bass controller. These also have the most control with volume, treble and bass adjustment controls and the power supply on this model is built-in, which is another plus.
Creative I-Trigue 3300 - $100
These are the most impressive
looking set that I tested. Great modern and compact design. Each satellite houses 3 Titanium tweeter drivers that produces rich sound in the upper frequency range, and they also do a good job with the midrange sound too. The real plus comes in the 6.5" sub, it is rich, tight and very deep. But, these speakers come with a big flaw that is in the amplifier. Creative boasts 80 watts peak output, the most watts out of the four reviewed, but the top volume is low in decibels in the upper to mid frequency range. Comparing to the others, with the volume control turned up all the way, I still had to turn up my computers volume almost all the way up to get anywhere near the volume of the ATP3s. If your not looking to turn up the volume, then these are great sounding speakers. But if it is loud full room filling sound you're looking for these won't be your choice. It does have the best bass output. Power supply is not built in on this model and does get quite warm.
In conclusion, I like Altec Lansing ATP3's the best for realism, fullness, control and total output. Next would be the Creative I-Trigue 3300 for it's great looks and deep sound. Then the Logitech Z-340's for it's inexpensive and modern design with above average performance. Lastly is the Labtec Pulse 420's because of the cheesey design and lack of overall sound quality, price is good.