Suggestions please choosing amp
 

Hi, i have a pair of speakers 90 watt rms. I want to buy a sub which is around 200-300 watt rms. What amp should i get for these two speakers and sub?

2/3/4 channel amp! I had a Alpine mrp-f600
​​​​​​ gave my components 150 watts each in the front and my sub 300 watts! good amp for a simple set up.. just bridge the rear channel for the sub

isnt 150watt per channel for the speakers too big? wouldnt it blow my speakers?

in some cases yes, I had the Infinity REF 6500cx which were rated at 90 watts rms.. but infinity actually recommended running them at 150 watt rms.. i had an Alpine mrp f300 and they put out 150 *2 @ 4 ohms bridged so Itook a chance and those 6.5s took them like a champ, ran perfect for 1 year n some months until I upgraded.. I guess it depends on the makes and build but I would run components at 150 a piece again only if the woofer looks like it could handle it but I'd always play it safe and start the gain low and work it up if the speakers want more..

there is not alpine where i live, only sony and pioneer and some other make called symphony.
if you could suggest a make i could check up on that would be great.
my speakers btw are sony xs-n6940.

hmm okay, those sonys got a max peak at 500 watts but it doesn't state the rms.. I'd start off with a 100 watt rms amp for those, if you got pioneer there check out the pioneer gm-d8604
it does 100 Watts rms per channel and 300 watts if you bridge 2 channels, might be a good amp for what you're looking for, ive never had Sony speakers so I wouldn't be able to tell you anything about them but those ones you showed me are a 5 way coaxial so I'm sure it'll need a good amount of power since it has a wide range to play

they are rms 90 watt.

does the gain comtrol the output power?

yes your suppose to set it according to the signal you receive from your head unit, you can play clean power on a 300 watt sub with a 1000 watt rms amp with the gains set right, you won't blow it.
but you can blow a 1000 watt sub with a 300 watt rms amp if the signals got clipping

this the first time i do something like this, i'm a bit worried. Does the gain has a gauge with output power?

nope I don't think most of them have any gauges but just start off slow and work your way up, listen to the speakers and listen if they start cracking, that's when you back down on the gain.. look up some videos on how to set gains, there's helpful ones out there.. some show you how to measure it using a digital multi meter