Why usually a stereo amplifier costs more than a stereo receiver with much more options and similar spec?

Right now, Amazon has the RS500 for about $200 less than the AS501. Given the similar model designations, you might think the "RS" designator is the receiver version of this integrated. However, dig into the specs, and you'll see it's not the case. This unit has higher RMS power (85 W vs 75W), lower distortion (0.019 vs 0.04), and specs like peak power, SNR, and freq response are not provided for the receiver (presumably because they're not worth noting). You also need to look at how power is calculated. Manufacturers are notorious for cheating AV receiver specs by reporting power over very narrow bandwidths (sometimes just a single freq!) whereas the power for this integrated unit is over the entire usable bandwidth. So, in short, the specs are not identical.

Do these amps have a quality headphone amplifier that would be able to properly drive headphones with a somewhat high impedance? Ex. Sennheiser HD 650

The headphone jack is connected through a voltage divider to the output of the power amp and its impedance is about 450 ohms. This guarantees that HD650 will have a bump in the vicinity of 100 Hz, the headphones’ resonance frequency, which will be hard to correct with the amplifier’s bass control. For headphones, I have a separate DAC/Amp pair (Topping D30 and JDS Atom).

Does the Yamaha A-S501 have a pre-amp out? If not, can one of its two recorder-outputs be used in lieu of a pre-amp out?

The above answers are somewhat confusing, here's a straight forward answer : IF the external amp is a 'power amplifier', the answer is NO, you cannot use the rec out output as a preamplifier. Power amps always output at the rated power, say 300 watts rms. You will blow yr speakers. Examples of power amps would be the Crown XLS and the Benchmark AHB2. They have no controls, and you need a true preamp to use them. Not this unit. Now, if the external amp is a 'variable amplifier', the answer is YES, you can use the rec out as a makeshift preamplifier. Variable amps always have a volume knob, or control, which, of course, controls the power of the amp. A good example of this would be the Topping LA90, one of the best made. Keep in mind that if you decide to use the rec out output, you will bypass the tone controls and volume of the integrated amp. And yes, the phono input and selector switch will work just fine, no worries. Finally, the AS501 is a splendid unit, why use an external amp at all? If you need more power, simply buy the 701 or 801 and sell that external amp! Anyway, hope this helps.

Are the knobs plastic or metal?

All knobs are plastic. I own this unit.

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🎶 Elevate your sound game with Yamaha’s sleek power player!

SMART ENERGY SAVER - Auto standby activates after 8 hours, balancing performance with eco-consciousness.
POWER THAT COMMANDS THE ROOM - Delivers a robust 100W per channel for crystal-clear, immersive sound.
SEAMLESS CONNECTIVITY NO COMPROMISES - Gold-plated digital coaxial and TOSLINK optical inputs ensure pristine audio signal transfer.
VERSATILE ANALOG INPUTS INCLUDING PHONO - Supports your vintage vinyl collection with premium gold-plated phono input.
DUAL SPEAKER OUTPUTS FOR FLEXIBLE SETUPS - Switch between Speakers A, B, or both for tailored soundscapes.

The Yamaha A-S701SL is a silver-finished integrated stereo amplifier delivering 100W per channel across the full audible spectrum (20 Hz - 20 kHz) with ultra-low distortion (0.019% THD). Featuring gold-plated digital coaxial and optical inputs alongside analog inputs including phono, it supports versatile connectivity for both modern and classic audio sources. Dual speaker outputs and an 8-hour auto standby mode combine flexibility with energy efficiency, making it a premium choice for audiophiles seeking natural, powerful sound in a stylish package.

Specificaties

Brand	Yamaha
Manufacturer	Yamaha Electronics
Model number	A-S701SL
Colour	Silver
Number of Memory Sticks	1
Speaker Surround Sound Channel Configuration	5 1
Item Weight	11 kg 200 g
Product Dimensions	43.5 x 38.74 x 15.24 cm; 11.2 kg
Batteries	2 AAA batteries required. (included)
Item model number	A-S701SL
Item Height	6 Inches
Item Width	15.25 Inches
Cooling type	Air cooled
Frequency Range	20 Hz - 20,000 kHz
Output Channel Quantity	2
Integrated Amplifier	Solid State
Speaker Output Jack	Wired
Voltage	240 Volts
Output Wattage	270 Watts
Power Source	AC
Compatible Device	Guitar, Double Bass, Keyboard, Viola, Harmonica, Banjo, Cello, Violin, Ukulele, Drum, Mandolin, Accordion, All
Are batteries included?	Yes
Optical input	1

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Yamaha A-S701SL Natural Sound Integrated Stereo Amplifier (Silver)

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