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After I blew them out, I redeemed a warranty and got a new 2.1 system of some standard computer tweeters + sub.

They are the Z-623 model from logitech, my previous set was theZ-2300, which was discontinued.

However, I'm discouraged because the Z-2300 model gave me a "louder" sound in my headphones, i.e. a crushing sub signal and siren-like mid's and hi's. With the Z-623's, I'm missing nearly half the sound I had before.

Do I now need a preamp? Any suggestions? I'm kinda bummed

no you need an AUDIO INTERFACE or a real soundcard.

Preamps

In general, the function of a preamplifier is to amplify a low-level signal to line-level. A list of common low-level signal sources would include a pickup, microphone, turntable or other transducers. Equalization and tone control may also be applied.

In a home audio system, the term 'preamplifier' may sometimes be used to describe equipment which merely switches between different line level sources and applies a volume control, so that no actual amplification may be involved. In an audio system, the second amplifier is typically a power amplifier (power amp). The preamplifier provides voltage gain (e.g. from 10 millivolts to 1 volt) but no significant current gain. The power amplifier provides the higher current necessary to drive loudspeakers.

Ok thanks for the clarification.
Is there a software patch (freeware if possible) that exists that might help me in this situation? I'm broke as a joke.

But an audio interface is now on my wishlist

try connecting the heaphones right to your pc instead of using the logitech speakers port. Not saying itll be great but it might be a FREE alternative.

If you have a little money you could buy a headphones amplifier to drive the pc signal to your headphones. Those would have an "amp" in them that might give you a nice full sound agian.