morbius396c
Responses from morbius396c
| Power Cord Burn-In Gmorris,I received my PhD at the Massachusetts Institute of Technology over 20 years ago. So your implication that I'm "wet behind the ears" is unfounded.In our work, we have to take into account the degree to whichthe cable that carrys the signal... | |
| Impedance Question: Tube Preamp with SS Power Amp John,The Krell only has balanced inputs - so the balanced outputof the ARC is 400 ohms. [ Ignore SE = single ended ].ARC states that it needs a minimum 20K ohm load. The Krellis a 100K ohm load to the ARC - so it meets the minimum.In the ARC outpu... | |
| Impedance Question: Tube Preamp with SS Power Amp John,On page 26 of the current FPB-series manual; under thecolumn labeled FPB 350Mc - the input impedance is specified as 100 kOhms.In fact, all the amplifiers, both stereo and mono; and allpowers have an input impedance of 100 kOhms.Dr. Gregory G... | |
| Power Cord Burn-In Brain Walsh,I can only say that I'm not particulary impressed with that work. I wouldn't call it "definitive". [ It's an undergraduate textbook, after all.]He lacks the mathematical rigor - and hence the insight -that one gets from actually solvin... | |
| Power Cord Burn-In Scottht,I'm with you - there are differences between cables becausethey are physically different.A cable is a transmission line - and the dimensions and geometry of the conductor and the dielectric, and other physical factors determine the electri... | |
| Power Cord Burn-In Scottht,Passing electrical signals through IC cables can't aligncopper or silver grains - there's just not enough energythere.In order for the grains to alter, you have to heat the cableso that you push the material into another phase on thephase ... | |
| Impedance Question: Tube Preamp with SS Power Amp John,I'd contact either Krell or Acoustic Research or both.I'm sure you're not the first to hook an AR pre to a Krell power amp.Perhaps the two manufacturers have some experience - eitherdirectly or garnered from their customers.Dr. Gregory Greenm... | |
| Impedance Question: Tube Preamp with SS Power Amp John,The Krell amps are "direct coupled" - that is they don't putcapacitors in the signal path. This is an advantage since"coupling capacitors" can have a negative impact on the qualityof the signal.Krell amplifiers also have DC protection circuit... | |
| How much Classe does a guy need? Bozzy,Most of the energy in music is in the bass, and very little inthe treble. Therefore, when your speaker is rated to handle200 watts - it is really the woofer that can handle 200 watts.The tweeter may only handle 10 watts.When an amp clips - t... | |
| How much Classe does a guy need? Bozzy,Don't worry about "overpowering" your speakers - you're morelikely to cause damage by "underpowering" them.The rating on the speaker is how much power they can dissipate.The power rating on the amp is how much it can put out cleanly.However,... | |
| Whats the krell sound? The Apogee Stages really sing when powered by theKrell FPB-300cx.The Stage is the type of speaker that can really use thepower and high current of the big Class A Krells.Dr. Gregory GreenmanPhysicist | |
| Whats the krell sound? The latest Krell "Class A" FPB amps - the ones with the "x"suffix - are somewhat of a departure from the classic Krellsound.They are much sweeter than their predecessors.I also agree that the "Krell sound" is very system dependent.If you have spea... | |
| Why dual subwoofers ? Let me second the post by Exertfluffer.Exertfluffer is absolutely correct - that the use of dualsubwoofers can give you better, smoother bass.However, that is only true if you know what you are doing duringthe setup.With dual subwoofers, you can g... | |
| Will sun exposure damage my speakers? YES!Direct sunlight will "cook" foam and the plastic resins in thefiberglass cones causing them to become embrittled which ultimately leads to failure.I'd keep the speakers out of direct sunlight.Dr. Gregory GreenmanPhysicist | |
| Bryston BP-25 or Adcom GFP-750 Preamp? Daltonlanny,I was considering the same choice you are a few years ago.The Adcom GFP-750 was rated by Stereophile as an "A" product,but that's when it's used as a passive preamp - which it doeshave a mode to support that.If you don't need either cu... |