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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Description

🎶 Elevate your audio game with Yamaha’s natural sound mastery!

POWER YOUR SPACE - Robust 60W per channel delivers immersive, room-filling sound that commands attention.
CUSTOM AUDIO CONTROL - Flexible A, B, or A+B speaker configurations plus dedicated subwoofer output for tailored soundscapes.
READY FOR MODERN LIFE - Includes remote control and supports analog phone inputs—perfect for your multitasking lifestyle.
SEAMLESS CONNECTIVITY - Effortlessly switch between Bluetooth wireless streaming and high-fidelity optical/coaxial inputs.
SLEEK DURABLE DESIGN - Premium metal chassis with shock-resistant build ensures lasting performance and style.

The YamahaAudio A-S301BL is a premium integrated stereo amplifier featuring 60 watts per channel, versatile Bluetooth and optical/coaxial inputs, and flexible speaker output options including subwoofer support. Housed in a durable metal chassis with remote control included, it’s designed to deliver rich, natural sound for discerning audiophiles and modern professionals alike.

Specifications

Tecnología de conexión	ptica
Protocolo Conectividad	Bluetooth
Tecnología inalámbrica	Bluetooth
Número de identificación de comercio global	00027108948690
Contenido de la caja	Contenido de la caja: Amplificador integrado Yamaha A-S301, control remoto, 2 baterías (AA/ R6/UM-3), cable de alimentación, Yamaha Garantía limitada de 2 años
UPC	027108948690
Tipo de embalaje	Standard Packaging
Fabricante	Yamaha Electronics
Número de artículos	1
Customer Reviews	4.5 4.5 out of 5 stars 1,116 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when('A', 'ready').execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( 'acrLink-click-metrics', 'click', { "allowLinkDefault": true }, function (event) { if (window.ue) { ue.count("acrLinkClickCount", (ue.count("acrLinkClickCount") \|\| 0) + 1); } } ); } }); P.when('A', 'cf').execute(function(A) { A.declarative('acrStarsLink-click-metrics', 'click', { "allowLinkDefault" : true }, function(event){ if(window.ue) { ue.count("acrStarsLinkWithPopoverClickCount", (ue.count("acrStarsLinkWithPopoverClickCount") \|\| 0) + 1); } }); }); 4.5 out of 5 stars
Nombre Modelo	A S301BL
Best Sellers Rank	#63,252 in Electronics (See Top 100 in Electronics) #199 in Audio Component Amplifiers
ASIN	B00MXUCN0A
Número de modelo	A-S301BL
Marca	YAMAHA
Dispositivos compatibles	Telefonos
Peso del producto	19,8 Libras
Dimensiones del artículo (profundidad x ancho x alto)	21,2"prof. x 17,5"an. x 8,6"al. pulgadas
Total del paquete según la medida elegida para referenciar precio	1.0 Count
Es impermeable?	Falso
Color	Negro -
Tipo de altavoces	Subwoofer
Tipo de controlador	Eléctrico con cable
Características del producto	A Prueba de Golpes
Modo de salida de audio	Estéreo
Usos recomendados para producto	Para ordenadores
Material externo	Metálico
Tipo de soporte vesa	Montaje de enchufe
Potencia máxima de salida del altavoz (en vatios)	60 Vatios
Es eléctrico?	Sí
Fuente de energía	AC
Número Pilas	2 AAA necesaria(s), incluida(s)

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