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Question: anyway to use headphones and keep speakers on like to hear both  thanks for any advice
Document: I wouldn't say these are the best speakers I've ever heard, but they're the best desktop computer speakers I've owned. I have a full blown home theatre that I sourced myself, bluetooth boxes, over-the-ear and in-the-ear headphones, and so on, so I feel like I know good sound when I hear it. These made me happy for the money I spent. Interestingly, and unexpectedly, they sound very nice at relatively low volumes.
I got tired of listening to my PC games using headphones, so needed a fresh set of speakers. Only a 2.0 set is required by me and I also wanted semi-small footprints to keep things in order on my desk, without sacrificing audio quality.These Gigaworks seemed to fit the bill nicely. After receiving them - my verdict is that ehhhh...  they're ok. But for what they are, they're pretty good.I should expand.
Received these Creative GigaWorks T20 speakers as a very thoughtful Christmas gift. They are a big improvement over the speakers that came with my computer (although I realize that isn't saying much). I can hear things over them that were not audible before. Too heavy in the bass for my ears, but I gather this is the norm nowadays, and anyway it appears to be controllable. So I especially appreciate the bass and treble controls on the front panel.
These little speakers are the most amazing ones you can get for that price.I can hear as much detail with them as with my Sehnheiser HD 558 headphones.They are well constructed, balanced, no distortion, the bass is clear, mids and highs very well defined,and they fill up a fairly large room no problem.You cannot go wrong buying these, they are amazing! It surprises me to see negative reviews on such an amazing product.
However, I find the Gigaworks have a more natural and pleasant sound, besides that they are in a different world as far as price goes. I have to give the edge in Bass to the Bose. So much bass from something this size is something you really have to hear to believe. As for the T20's, the base is quite good but it's not going to shock anyone. The headphones jack, extra line in, and treble/base adjustments on the T20 are very nice also.
Now I don't think a lot of people will be carrying this around from place to place everyday. BUT, if you needed to take some speakers to somewhere like a friend's apartment or a hotel room, and you don't want to lug around a heavy boombox, these will do. However, the setup of the plugs and cords and whatnot will keep these from being truly portable.
Now, I have to shut my office door to keep from "blasting" out my co-workers. These GigaWorks T20's blew me away with their rich sound and decent price. I also like the way the volume control lights up blue when powered on. The individual bass and treble controls are a plus when I have poor quality MP3's or audio from my favorite video presentations. I am now a Creative Labs devotee when it comes to 2.0 speakers.
This set of speakers is pretty neat. I think they do their job pretty well. I've had them since March of this year and they go loud! The bass is really thumping even when at lower registers. Treble I don't mess with too much so it either doesn't do much or I just don't notice. I use these with headphones a lot and although the sound is nice with them sometimes I wish it could be cranked just a little louder.Great but falls a little short of exceptional.
The only reason I gave 4 stars for "ease of use" is that the cord to plug them in to an audio outlet is kinda short. I had to rearrange my room a bit so I could easily switch the plug between my computer and radio, but rearranging was fun anyway so it's not very much of a complaint. :)Seth
This is one of the only desktop set of speakers with bass, treble and volume controls on the front. Also with input and headphone jacks. Very clear sound throughout the range. As with nearly all speakers and headphones these days, the bass is too loud, but with the controls on front that is easy to adjust. I guess if you like hip-hop adn play video games you'll want to mondo bass sound, but for jazz or acoustic music it is too much.
Answer: You'd have to use a splitter at the line-out jack on the source.