power requirement (amps) calculation for amplifier/speakers question.

[sim_tcr]

Hello,

My speakers
8 Watts RMS 4 Ohm x 4 = 32 Watt RMS (left, right, surround left and surround right)
18 Watts RMS 4 Ohm center speaker
22 Watts RMS 4 Ohm subwoofer

My Amplifiers
XH-M120 PAM8610 Dual Channel 2x15W (at 4Ω load) - This will drive 8 Watts RMS 4 Ohm x 2 left, right speakers
XH-M120 PAM8610 Dual Channel 2x15W (at 4Ω load) - This will drive 8 Watts RMS 4 Ohm x 2 right, surround left and surround right
TDA2030A 18W Mono - This will drive 18 Watts RMS 4 Ohm center speaker
TPA3110 30W Mono or LM1875 30W Mono - This will drive 22 Watts RMS 4 Ohm subwoofer
All of above amplifiers run on 12V.

Now I am trying to find the correct power supply for above project, How many amps I need?

I read that "Calculate the Amperage: Divide the wattage by the voltage using the formula A = W / V."
So does that mean,
for XH-M120s - 2.5A x 2
for TDA2030A - 1.5A
for TPA3110 or LM187 - 2.5A
Total - 9A

Is above assumption correct?

 

[alpha1]

Hello,

My speakers
8 Watts RMS 4 Ohm x 4 = 32 Watt RMS (left, right, surround left and surround right)
18 Watts RMS 4 Ohm center speaker
22 Watts RMS 4 Ohm subwoofer

My Amplifiers
XH-M120 PAM8610 Dual Channel 2x15W (at 4Ω load) - This will drive 8 Watts RMS 4 Ohm x 2 left, right speakers
XH-M120 PAM8610 Dual Channel 2x15W (at 4Ω load) - This will drive 8 Watts RMS 4 Ohm x 2 right, surround left and surround right
TDA2030A 18W Mono - This will drive 18 Watts RMS 4 Ohm center speaker
TPA3110 30W Mono or LM1875 30W Mono - This will drive 22 Watts RMS 4 Ohm subwoofer
All of above amplifiers run on 12V.

Now I am trying to find the correct power supply for above project, How many amps I need?

I read that "Calculate the Amperage: Divide the wattage by the voltage using the formula A = W / V."
So does that mean,
for XH-M120s - 2.5A x 2
for TDA2030A - 1.5A
for TPA3110 or LM187 - 2.5A
Total - 9A

Is above assumption correct?

You missed out two very important details:
1) What is the sensitivity of your speakers? Some speakers can produce 95 dB with 1 W power being fed in, few speakers struggle to produce even 85 dB.
2) How loud you intend to hear and approximately how far away from the speakers?

 

[sim_tcr]

You missed out two very important details:
1) What is the sensitivity of your speakers? Some speakers can produce 95 dB with 1 W power being fed in, few speakers struggle to produce even 85 dB.
2) How loud you intend to hear and approximately how far away from the speakers?

From the speaker specs, I cant find sensitivity.
These are placed in an apartment main hall one corner. We sit 6 feet away from the central speaker.

 

[ketansethi1987]

I think 10 amps would be enough if genuine