Mondo Naim audio

[GuidoR]

@audio2 non hai notato deterioramento a tagliare i cavi di alimentazione?

[audio2]

no quei cavi li o li ho comperati già finiti da 1 metro oppure li ho assemblati io sempre da metro.

però e purtroppo per il costo quelli già finiti di fabbrica vanno meglio, c'è poco da fare.

secondo me c'entra la minore resistenza perchè le spine e le prese le macchinano assieme

in modo industriale. ma non sono sicuro di questo, quindi mi taccio.

[gian62xx]

1 ora fa, GuidoR ha scritto:

@audio2 non hai notato deterioramento a tagliare i cavi di alimentazione?

Fantasie.

[GuidoR]

Un riassunto della filosofia Naim

On the audio circuitry (from Wikipedia: Naim Audio amplification - Wikipedia)

Audio circuitry

Vereker believed that loss of information, often due to overload protection, was a damaging type of distortion that amplifiers were vulnerable to.[12] Vereker attempted to reduce information loss at the design stage, by unconventionally disregarding test-bench measurements of harmonic distortion performance and output into a static resistive load.[12] Naim says that to achieve amplifiers with low harmonic distortion, low noise, wide power-bandwidth, and constant dynamic output impedance, they pay attention to balancing dynamic impedance, open-loop bandwidth, slew rate, and propagation delay; the amplifiers are not subject to slew-rate limitation between 5 Hz and 50 kHz.[13]

Vereker believed that a properly designed amplifier would not need tone controls, since these filters were often palliatives for poor design. He contended that tone controls represented a cost of manufacture yet were detrimental to sound quality.[12][14][15] Therefore, starting with the NAC 12, Naim amplifiers have never featured the tone controls that were popular elsewhere in the industry.[3][4][10][14][16]

Vereker considered Naim amplifiers belong to the "class B" category where bias current is minimised. He believed that "class A" design was wasteful and masked significant design issues.[Notes 1]

Electrically, the pre-amplifiers are bandwidth-limited, and while Naim is open to the possibility that users might match their pre-amps with another make of power amplifier, Naim warns against using other makes of pre-amplifiers with Naim power amplifiers, arguing that the former define the operating parameters of the latter and guarantee its stability.[18] In practice, modern products' bandwidth has been much extended, but the pre- and power-amplifiers are of such a tight operational fit and sonic synergy that they are rarely used with other makes.[19]

Power source[edit]
Naim has from the outset externalised pre-amplifiers' power source, unlike other manufacturers, citing the undesirability of having AC and transformers' powerful magnetic field near sensitive pre-amplifier circuitry – the "key point of separates".[20] Its over-engineered power supplies, aimed at ensuring adequate 'headroom' (ample reserves of power) for transients, are equally well-known.[1][7] Naim strongly believes that an ample source of power is of the greatest importance, and the availability of external PSUs to accompany its products also reflects the philosophy.[4] The performance of most of its pre-amplifier range benefits from adding one of a number of power supplies, which provide permutations for upgrading.[8]

Output protection[edit]
Vereker also believed that a well-designed amplifier must be stable at all times when driving real-life loads, which are different from those achieved in lab conditions because loudspeakers' impedances vary with frequency.[9] The inherent compromise between the pursuits for stability and sound quality means that Naim's power amplifiers are designed to work optimally with its own moderately priced NAC A5 speaker cable, and its predecessor NAC A4.[19] Product manuals warn users against using "high-definition wire or any other special cable between amplifier and loudspeaker".[18][21] Whilst other manufacturers habitually employ Zobel networks[1] (or an output filter which enhances amplifiers' stability) to protect against use with speakers and or cables with very high-capacitance, Naim amplifiers routinely omit these filters because of their adverse effect on sound quality. The design decision was made to use a suitable length of speaker cable (a minimum of 3.5m, with 5m being optimal) to provide the effective inductance.[1][19]

Isolation[edit]
There has been a trickle-down of research from flagship models, particularly since the launch of the 5-Series. Subtle mechanical and electronic changes introduced in lower-rung products — as a result of research at the flagship product level — have contributed to build and sound quality: control of internal heat dissipation, wiring, radio-frequency interference and mechanical vibration through more efficient materials, compliant mounting and decoupling.[22][23]

Naim have found that, with increasing amounts of digital circuitry in their boxes, the electronics are much more susceptible to microphony and other mechanical vibration.[24][25] Inside the top-of-the-range NAC 552 pre-amplifier, the circuit boards are weighted down and have their own suspensions, and there are transit bolts to secure the suspended boards during transport.[25] The rear-mounted mains switch and IEC socket are decoupled to mitigate microphonic effects.[24] The NAIT XS, launched in late 2008, is the first Naim device to use a new bayonet PCB-mounting technique to "float" the circuitry.[24] Also during the development of the NAP 500, Naim discovered that transformers and the power supply electronics in close proximity to audio circuity also affects power amplifiers. Their top models – the NAP 300 and the NAP 500 – now externalise power supplies in separate cases.[19]
 

[gian62xx]

@GuidoR a me piacerebbe sapere il motivo della sola alimentazione +24vdc. Normalmente nelle circuiterie -per lo meno quelle che ho "molestato" per hobby- si hanno 2 tensioni, + e - e zero, tre fili. in tuti gli alimentatori esterni naim abbiamo sempre 0 e +24.

[GuidoR]

@gian62xx Sinceramente le mie conoscenze elettriche sono basiche, no ti so rispondere 

[Gustavino]

@gian62xx  x semplicita'

[Bocadillo]

@gian62xx beh Gian, é il metodo più corretto... 0 indica il negativo (è come dire che sono sinonimi) e il positivo indica l'esatta tensione, visto che ovviamente si può uscire non solo con 12 e 24, ma con "n" valori 

[tarmac]

Mi sto guardando in giro per una coppia di diffusori nuovi  per poi pentirmene ..........( budget max 3k )

 

come le vedete con accoppiata 272/200 ?

 

https://pmc-speakers.com/home-audio/prodigy/prodigy5/

 

 

[Paolotto]

Io con 180, 72 e Hicap udii cose che voi umani.....

[GuidoR]

@tarmac pmc e naim sono sempre un'ottima accoppiata. Questo modello specifico non lo conosco, ma sarà in linea con la casa. Io ho le twenty5 26 e mi piacciono. Se puoi ascoltale

[GuidoR]

@audio2 quando hai faccettato i cavi di alimentazione, hai poi dato una firma al fascio di cavi?

[audio2]

non ho capito

alcuni sono fascettati al mobile

altri sono fascettati al muro tramite un anello a vite

altri fanno semplicemente delle volute un pò ampie

[essezeta]

6 ore fa, GuidoR ha scritto:

Se puoi ascoltale

 

 

Il problema è dove ascoltarle! 

I rivenditori in Italia sono tutti classificati come "pro". L'unico "home" è il distributore stesso, gammalta, di Pisa.

Saluti e buon anno,

Stefano

[GuidoR]

@audio2 pensavo che le avessi fascettati tutti assieme in un unico gruppo, invece mi sembra di capire che fai seguire dei percorsi ad ogni cavo o gruppetti di cavi