let's work backwards for a bit...

you want your system to do 85db SPL (that is reference level, normal listening is usually some way below that, like 75db SPL)

so 85db SPL outout, and you are sitting what, 3m away from the front.

now, JBL Northridges are fairly efficient, about 90db/w/m

then we plug these figures into this calculator (http://www.crownaudio.com/apps_htm/designtools/elect-pwr-req.htm) and give it 3db headroom,

it turns out you only need about 6W steady output, really.

Even if you up the headroom to 9db (meaning when there's a explosion or something, it goes to 85+9 = 94db SPL) you will only need 23W per channel.

So the Onkyo, rating at 185 W (6 Ω, 1 kHz, 1 channel driven, JEITA) probably translates to max 60W 6 Ω 20Hz - 20kHz all channels driven has more than enough power.

Onkyo seems likes to play trick with their rating figure to the novice user

let's work backwards for a bit...

you want your system to do 85db SPL (that is reference level, normal listening is usually some way below that, like 75db SPL)

so 85db SPL output, and you are sitting what, 3m away from the front.

now, JBL Northridges are fairly efficient, about 90db/w/m

then we plug these figures into this calculator (http://www.crownaudio.com/apps_htm/designt...ect-pwr-req.htm) and give it 3db headroom,

it turns out you only need about 6W steady output, really.

Even if you up the headroom to 9db (meaning when there's a explosion or something, it goes to 94db SPL) you will only need 23W per channel.

So the Onkyo, rating at 185 W (6Ω, 1 kHz, 1 channel driven, JEITA) probably translates to max 60W 6Ω 20Hz - 20kHz all channels driven has more than enough power.

105db is for the LFE channel, IIRC so you need a sub with >300W (if all other things remain the same)

105db is for the LFE channel, IIRC so you need a sub with >300W (if all other things remain the same)

The subwoofer normally has its out power amp to cater for this. So 85dB calculation for front speakers are more than loud enuf.

For music, the recordings do not need the +30dB headroom. Its mainly a movie thingy (Dolby IIRC)

I use to worry about this then but now my tube amp is only 15wpc and driving my 125w rms speaker without any problem but I usually never listen past 10 o'clock on the dial.

Basic rule is if you only listen at normal to moderate volume you dont have to worry about this stuff

no idea bro. im a simple guy. i dont use blender