Power out rms- 4 o 8 homs? - Sony str-4800sd stereo receiver with manual

Whatever the watts is on amp

Go to owners manual in the specifications page.
Will show the impedance, you should mach the impedance output with the speakers,2,4, 8 Homs impedance and how many watts RMS or peak.

It depends on whether you have the M2150, A2150, or E2150.

M2150 Class A/B Two-Channel Full-Range Amplifier Specifications:
Rated Power 14.4 V Stereo: 70 W RMS x 2 @ 4 ohm, 110 W RMS x 2 @ 2 ohm
Rated Power 14.4 V Bridged: 140 W RMS x 1 @ 8 ohm, 220 W RMS x 1 @ 4 ohm
Rated Power 12.5 V Stereo: 45W RMS x 2 @ 4 ohm, 75W RMS x 2 @ 2 ohm
Rated Power 12.5 V Bridged: 90W RMS x 1 @ 8 ohm, 150W RMS x 1 @ 4 ohm
THD at Rated Power: 12.5V: <0.08% THD, 20Hz-20kHz, 14.4V: <1% THD, 20Hz-20kHz
S/N Ratio: >104 dB referred to rated power (A-weighted, 20Hz-20kHz noise bandwidth)
Frequency Response: 10 Hz-25 kHz (+0, -1dB)
Damping Factor: >200 @ 4 ohm per ch. / 50 Hz, >100 @ 2 ohm per ch. / 50 Hz
Input Range: 200mV, 8V RMS

E2150 Class A/B Two-Channel Full-Range Amplifier Specifications:
Rated Power 12.5 V Stereo: 45W RMS x 2 @ 4 ohm, 75W RMS x 2 @ 2 ohm
Rated Power 12.5 V Bridged: 90W RMS x 1 @ 8 ohm, 150W RMS x 1 @ 4 ohm
THD at Rated Power: <0.08% @ 4 ohm 20Hz-20kHz
S/N Ratio: >104 dB referred to rated power (A-weighted, 20Hz-20kHz noise bandwidth)
Frequency Response: 10Hz-25kHz (+0, -1dB)
Damping Factor: >200 @ 4 ohm per ch. / 50 Hz, >100 @ 2 ohm per ch. / 50 Hz
Input Range: 200mV, 8V RMS

A2150 Class A/B Two-Channel Amplifier Specifications:
Rated Power 12.5 V Stereo: 45W RMS x 2 @ 4 ohm, 75W RMS x 2 @ 2 ohm
Rated Power 12.5 V Bridged: 150W RMS x 1 @ 4 ohm
THD at Rated Power: <1% @ 4 ohm 20Hz-20kHz
S/N Ratio: >104 dB referred to rated power (A-weighted, 20Hz-20kHz noise bandwidth)
Frequency Response: 10Hz-25kHz (+0, -1dB)
Damping Factor: >200 @ 4 ohm per ch. / 50 Hz, >100 @ 2 ohm per ch. / 50 Hz
Input Range: 200mV, 8V RMS

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

4 Ohm Stereo Power (RMS): 250W X 2
4 Ohm Mono Power (RMS): 850W X 1
2 Ohm Stereo Power (RMS): 450W X 2
Signal-to-noise ratio: 100 dB
Frequency Response: 5 Hz - 50 KHz
Total Harmonic Distortion: 0.05%
Input Sensitivity: 200mV-4V
Length: 16.93"
Width: 11.66"
Height: 2.37"
Continuously variable 0 - 18dB Bass Boost
Built-in continuously variable 18dB per octave crossover, from 50Hz to 250Hz

• Bridged Max Power: 520 Watts
• RMS Mono: 170
• Variable Low Pass 40Hz-120Hz
• Variable Hi Pass 150Hz-1.5Khz
• THD: 0.02%
• Die-Cast Aluminum Heat Sinks

well first of all you cant bridge subs... you can bridge an amp... and for 2 they are probablly not 1000 watts, make sure you understand RMS and what the sub can ACTUALLY HANDLE properly... i would get a 1000 to 1500 watt RMS that is RMS RMS RMS RMS amp not one that says 2000 watts MAX POWER cuz thats cheap ****... get a kicker JL hifonic alpine or something in that category that actually tells you the TRUE power output of the amp... then run those 4 subs in a parallel circuit so its like really only having 2 subs. make sure then these subs do not run less then 2 ohms at the terminals while in a parallel, then bridge these subs acting as 2 subs not 4 to your TRUE 1000 watt amp and you should have a good powerful system

what is the amplifier model number and how many channels does it have... if you can just read off the numbers on the top of the amp...

4 Ohm Stereo Power (RMS): 75W X 2
4 Ohm Bridged Power (RMS): 250W X 1
2 Ohm Stereo Power (RMS): 125W X 2
Signal-to-noise ratio: 100 dB
Frequency Response: 5 Hz - 50 KHz
Total Harmonic Distortion: 0.05%
Input Sensitivity: 200mV-4V
Continuously variable 0 - 18dB Bass Boost
Built-in continuously variable 18dB per octave crossover, from 50Hz to 250Hz

Amplifier Class AB
Number of Channels 2
RMS Power (4 ohms) 120 watts x 2 channels
RMS Power (2 ohms) 200 watts x 2 channels
RMS Power (1 ohm) Not Stable
Bridged RMS Power 400 watts x 1 channel
Total RMS Power Output 400 watts
Peak Power Output 1000 watts watts x 1 channel
Minimum Impedance Unbridged 2 ohms
Minimum Impedance Bridged 4 ohms
THD at Rated RMS Power 0.1%
Speaker Level Inputs No
Preamp Outputs 1 pair
Built-in Crossover High-pass (HP), Low-pass (LP), Full (AP)
High-Pass Crossover Frequency 40 - 250 Hz
Low-Pass Crossover Frequency 40 - 250 Hz
Subsonic Filter N/A
Signal-to-Noise Ratio N/A
Channel Separation N/A
Bass Boost 0 - 18 dB
Bass/Gain Remote Yes
Fan Cooled Yes
Fuse Rating 20A x 2

The easiest way to think of wiring voice coils and subs is this:

• Two items of the same impedance in parallel = Half of the impedance
• 4 ohms in parallel with 4 ohms = 2 ohms
• 8 ohms in parallel with 8 ohms = 4 ohms
• Two items of the same impedance in series = Double the impedance
• 4 ohms in series with 4 ohms = 8 ohms
• 8 ohms in series with 8 ohms = 16 ohms

In this case, you want to wire two subs, each with dual 4 ohms voice coils, so that the total equals 2 ohms. Your options are:

• DVCs in parallel, 2 subs in series = 4 ohms
• DVCs in series, 2 subs in parallel = 4 ohms
• DVCs in parallel, 1 sub = 2 ohms

With two, dual 4 ohm subs, you can only have 1 ohm or 4 ohm total impedance.