The Fender Rumble 100 is a great amp for the Ibanez GSR200 bass guitar. It's a 100-watt amp with a 12-inch speaker, so it has plenty of power to handle the GSR200's output. The Rumble 100 also has a 3-band EQ, so you can dial in the perfect sound for your bass. Plus, it has a headphone jack, so you can practice without disturbing anyone.
Ampeg BA-115HP
The Ampeg BA-115HP is another great option for the Ibanez GSR200 bass guitar. It's a 150-watt amp with a 15-inch speaker, so it has even more power than the Rumble 100. The BA-115HP also has a 3-band EQ, as well as a midrange control. Plus, it has a built-in compressor, which can help to even out your tone.
Hartke HD15
The Hartke HD15 is a great choice for bassists who want a portable amp with a lot of power. It's a 15-watt amp with a 6.5-inch speaker, but it can easily fill a small room with sound. The HD15 also has a 3-band EQ, as well as a built-in overdrive circuit. Plus, it's very lightweight and easy to carry around.
Roland Micro Cube Bass RX
The Roland Micro Cube Bass RX is a great choice for bassists who want a compact and affordable amp. It's a 2-watt amp with a 5-inch speaker, but it can still produce a surprisingly loud sound. The Micro Cube Bass RX also has a 3-band EQ, as well as a number of built-in effects. Plus, it runs on batteries, so you can take it anywhere you go.
Ultimately, the best amp for the Ibanez GSR200 bass guitar depends on your individual needs and budget. Any of the amps listed above would be a great choice, so take some time to compare them and decide which one is right for you.