If the appliance says 110v-220v (or240v) you are fine.
If it just says 110v, then no. If you don't want to part with the item, you can buy a power converter here for around $100 SGD, but I don't really recommend it.
One of the few things we brought from the U.S. that is not dual-voltage is the rotisserie to our Weber gas grill, but I know a family that brought their XBox video game and run it on a converter with no problems (so far - the thing runs HOT.)
Yes, you'll need adapters for your plugs, but they can be had for very little... $2-ish. You can also buy power strips that will accept many different plug types, including U.S. Very handy for the office.
Don't know if you've done your househunting trip yet, but our
condo's master bath power outlet has a dual-voltage switch like most hotels for shavers. I also use it to charge my power drill which is 110v only. (Not that the drill sees much action. This isn't a DIY kind of place. I miss my table saw.)
Regarding your Audio equipment... check the voltage. If it is not dual, sell it. In fact sell all your electronics that are not 220-240v compliant and start fresh here. Don't store it. It will probably be obsolete and you won't want it or be able to sell it when you get back. Speaking from experience here.
One last tip... If you like to grill food and you are planning on living in a place that has a patio and allows it, definitely go buy a brand new one and include it in your shipment. Some movers won't let you bring your grill due to the mess, but if it's new - no prob. You won't believe what people pay here for a grill that can be had at Sears for $300. ($1500-$2000).
If you have any other Q's, PM me and I'll give you my email address so you can contact me directly.
Good luck!
One note on the grill... if you bring one, you'll need to pay the propane delivery dude about $100 to change the connector so that it fits Singapore propane tanks. Upside is, they deliver the propane and install it for you when you run out for about $30 SGD.
FWIW.. I don't have a grilling fetish. It just came to mind.