georgehifi
Responses from georgehifi
| Gain of line preamplifier "Variable output impedance is "heavy disadvantage" of any passive preamp even if you have substantially high input impedance of your amplifier."Wrong Czarivey, ^you stated^ and the reason is.A 10kohm passive can have a varying output impedance, at... | |
| sonic frontier subwoofer connection Vasser77Before you do anything suggested, we need to see if you get a good impedance match with all this. Your SF3 is tube and may not be a great impedance match with the combined load of your main amp and both subwoofer amps, and you may not get ... | |
| Long cable run from my phono preamp to linestage. Almarg is right Audiobrian, to get the best out of it we need to know the output impedance of your phono stage first.Then I will calculate for you the maximum capacitance of 4mt interconect you should use, as it will roll off the highs a bit if no... | |
| Gain of line preamplifier Like I asked, show the electronic math?And then post a link to a "quality" interconnect that has high capacitance more than 200pf per foot. And I'll show you a rubbish interconnect?Because it will create HF filter with tube preamps as well as pass... | |
| Lightspeed Attenuator - Best Preamp Ever? You are semi right Roy, each package of the quad matched set has a 1 x led and 1 x ldr inside it. But it is the led part that will light up at close to it's specified max brightest when the volume is min or max, this is why at half volume it light... | |
| Lightspeed Attenuator - Best Preamp Ever? Hi Roy. Sorry about the delay in answering, I've been busy making them.There is no advantage in leaving it on 24/7, in fact if it is not used for a while, I "suggest" it be de-powered. As I've only had a couple out of the close to 1000 units made ... | |
| Gain of line preamplifier "Nelson Pass would also agree with me"If that's not putting words into Nelson mouth, I don't know what is.Cheers George | |
| Gain of line preamplifier "Variable output impedance is heavy disadvantage of any passive preamp even if you have substantially high input impedance of your amplifier."Please give your reasons why (using laws of electronics)1: If using a low (<100ohms) source impedance ... | |
| Gain of line preamplifier These days with sources giving out 2v or even more with low output impedance, and amps only needing 1.5v or less for full output. There is no need to do any preamplifying.All you need is a passive volume control with a unity gain buffer after it i... | |
| Bridged classe audio DR9 When you bridge an amp, the damping factor is halved, that means the bass will not be as controled. Not worth it.Cheers George | |
| Bladelius-Thor mk3/Leema-Tucana 2/Norma IPA-140? It's would be very much in the others best interest to show the 2ohm figure, if it is a good spec, and almost doubles from 4. The only reason I can think of not showing a 2ohm spec for any expensive SS amp, would be, either it is Mosfet output or ... | |
| VAC amps and Focal Grand Utopias at $195k a pair Al (Almarg) is correct. I question that anyone would have heard the Utopia's at their best, as they have an impedance that goes down to almost 2ohms arond 50hz.And it's a pity Stereophile din't do a - Phase Angle graph as well for these as that co... | |
| Which amps with B&W 800D's... Pass Labs or Classe? Dave (Mad14) We listened just yesterady to many amps on the B&W800D's which are a pig of a load (combined impedance and - phase angle), and the amp that won was the one that could double it's wattage for each halving of impedeance from 8 to 4 ... | |
| How does a step up transormer affect sound- I always say if the step-up transformers are double the specs of the amps, it will be fine, maybe even a touch better as they serve as isolation transformers as well.Just make sure they are big enough e.g.: if your amp maximum consumption is 3amps... | |
| Bladelius-Thor mk3/Leema-Tucana 2/Norma IPA-140? There are a lot of well wishers on this forum, that say this amp that amp is the best, without any regard to what kind of load the amp is seeing from the speaker.Ok, you need to look at graphs of both these speakers, impedance vs negative phase an... |