SPECTRAL

[gorko1]

Ima kdo konkretne izkušnje z Spectral ojačevalci? Namreč zanima me, če je mogoče v praksi dobiti uspešno sinergijo s cevnim predojačevalcem? Ne zanima me iz revij naučeno pametovanje, da gre zraven samo Spectral ojačevalec in MIT kablovje, ampak morebitna konkretna izkušnja. Gre pa predvem za DMA-90 ali DMA-100.





LP,
Goran

[ambasador]

Nix...

drugače pa že 20 let kombiniram lampaške preje s tranzistorskimi končnimi stopnjami. In cela kopica prijateljev tudi.

Imam 3 topologije lampaških prejev: triodni, triodni z lokalnim feed-backom in Srpp. Vsi kompletni s phono vhodi v isti topologiji. Lastna izdelava, sumljivost kvalitete visoka, hahaha.

Šalo na stran, velja vzeti v obzir tudi ta vidik. Ravno zaradi kompatibilnosti izhoda pre-ja z vhodom Spectrala, ker menim da je tu ključ uspešne kombinacije. Ker so impedance ne dragih prejev dokaj visoke, igra tudi povezovalni kabel pomembno vlogo.
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Carpe Diem

[ajka]

LP

Parit Spectrala z lampašem je nelogično dejanje ...
Spectral je znan po odličnem "Rise Timu" in "Slew Ratu" kar bi "lampaš" izničil ... Zato ni "srečati" niti drugih tranzistorskih predojačevalcev v resnih sistemih, kot samo "Spectral" morda še FM ...

Seveda "audiofilska domišlija" nima meja in verjetno je ideja nastala zaradi "ugodnih" cen rabljenih starih modelov ... Če pogledamo na trg rabljenih starih modelov lampašev in morebitno parjenje z njimi pa te spreleti srh kakšna "zvočna mineštra" bi nastala .
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~ ** ~

[gorko1]

Rabljeni Spectral ojačevalci niso nič bolj ugodni, kot druge renomirane znamke. Ne skrbi me Rise Time in Slew Rate ampak morebitne DC/Mhz oscilacije, ki bi lahko uničile ojačevalec. Na Audiogonu je en tip omenil,da se ojčevalec kar lepo segreva, če uporabi druge kable kot MIT. Spectral je baje celo tako strikten, da ne prizna garancije v kolikor ugotovijo, da ni bilo parjeno z njihovimi predojačevalci in kabli.

LP,
Goran

[ambasador]

[ambasador]

Dc na izhodu lampaša ne obstaja, ker gre izhod preko veznega kondenzatorja. Temu lahko očitaš vse grehe tega sveta - a DC ne spusti skozi ni za boga.
Oscilacije - če je že kabel problem - je potrebno poznati lastnosti vhoda (impedanco v funkciji frekvence tudi izven spektra).

Sicer pa se bom lotil pregledat moj arhiv, ker imam v memoriji da se to da kombinirati z lampami.
_________________
Carpe Diem

[gorko1]

Bullshit?


Note: Whereas other Spectral Audio components (i.e. their preamplifiers and digital source components) may be used with any other brand of equipment, Spectral mandates that their non-Universal amplifiers be driven by a Spectral preamplifier to ensure reliable operation. Spectral Universal amplifiers however may be driven directly by any brand of preamp, D-A, or surround sound processor. In addition, Spectral amplifiers need to be used in conjunction with the proper Spectral-approved MIT interconnects and speaker cables. These usage guidelines are now a condition of Spectral's warranty on their amplifiers. There are several reasons for these guidelines:

Because of their wide bandwidth, Spectral amplifiers can amplify high frequency signals in the MHz range at massive power levels. Therefore radio frequency noise must be kept out of the amplifier. The MIT interconnects contain RF protection, and Spectral preamplifiers are stable at these high frequencies.
Unlike most all solid state preamps, Spectral preamplifiers are true discrete designs, are DC coupled, and can output the high current that the (non-Universal) Spectral power amps are designed to be driven by. Other brands of preamplifiers often use integrated circuits or other devices which will probably not be able to drive the amplifier properly.
As part of their stability design, Spectral amplifiers use an output network found in the proper MIT speaker cables. (Spectral has found that by placing this network close to the load, i.e. the speaker, they can achieve superior results.)
What will happen if you don't follow these guidelines? Well, it's a probability thing. You may not encounter any problems—or you may encounter premature failure of some components in the amplifier. Or (worst case) your amplifier may suffer severe RF problems, and you will have to pay to have all the output devices replaced (which is expensive). Therefore, we highly recommend that you follow Spectral's warranty and operational guidelines.

LP,
Goran

[stormsonic]