almarg
Responses from almarg
| Amp Input impedance - old Macintosh C-20 preamp with modern SS amp I know some amps are 47k,would that be close enough. I suppose so. And if the bass response begins to roll off slightly as a result, it could probably be compensated for in a reasonable manner with a slight tweak of the settings that are used i... | |
| Amp Input impedance - old Macintosh C-20 preamp with modern SS amp Toolbox149 5-26-2017 The whole system is bi-amped using Dahlquist high/low pass which rolls of the high pass at about 80 hz at 18 db an octive.... All of my inputs (mostly my CD equipment) feed into my primary preamp, a Bryston BP-25. From there... | |
| Amp Input impedance - old Macintosh C-20 preamp with modern SS amp Hi George,Thanks for providing the link to the manual. The 23K figure, which Kdude66 also referred to earlier, is stated in the manual to be for a left PLUS right output (in other words a mono output) which the preamp provides. The output impedanc... | |
| Tekton Double Impacts Thanks, Willsw. I missed the statement in the review about the three outputs (RCA, speaker, headphone) being connected in parallel, which of course would not normally be done in a higher powered amp. So, yes, driving a sub and a separate power amp... | |
| Tekton Double Impacts Willsw 5-26-2017 Regarding two pre outs/splitting the output, the output impedance of the MZ2’s outputs is very low and shouldn’t have a problem with two loads to drive. From the Stereophile review’s measurements section: "The output impedance was... | |
| Amp Input impedance - old Macintosh C-20 preamp with modern SS amp Thank you, John (Roxy54).Toolbox, first, I’m not sure I understand the comment just above about biamping. If it’s a quadraphonic system you’ve got four speakers, and your two Adcom amplifiers provide a total of four channels of amplification, rath... | |
| Synergistic Red Fuse ... Thank you, Kenny (Kdude66). I’ve enjoyed your posts in the Tekton Double Impact thread.Geoffkait 5-26-2017 Ignore the AV just like the AC when it’s traveling in the direction toward the wall outlet. You can’t hear what’s headed toward the wall out... | |
| Slight hum in my amp. Is this normal? Thanks, Ralph. To be clear, though, am I correct in believing that to the extent the asymmetry of the waveform corresponds to a 2nd harmonic component, neither a DC blocker nor a transformer would eliminate it?Best regards,-- Al | |
| Tekton Double Impacts Mofojo 5-25-2017 Does the MZ2 only have one set pre outs? Can another be added if so as an option? If I was not happy with the one watt I would want to run the MZ2 as a preamp and still have an extra preout to run a JL sub. If a second set of pre-... | |
| Slight hum in my amp. Is this normal? Atmasphere 5-24-2017 DC on the line occurs when 1/2 of the AC line (for example, positive going portion of the AC waveform) is loaded while the other half is not.Space heaters or hair dryers on half power do just exactly that. So one half of the A... | |
| Should I Switch Preamps? Hi Tim,The rule of thumb guideline is commonly stated that way, but that is a misleading oversimplification IMO. In particular, it does not take into account that designs which use a coupling capacitor at their output, such as the majority of tube... | |
| Synergistic Red Fuse ... Great to see you back here, Mapman. Many here have noticed your absence in the past few months. Hope all is going ok for you and the family. As well as for Frank, of course.Best regards,-- Al | |
| Should I Switch Preamps? Yes, as far as I am aware the Capri (either the original version or the current S2 version) should be a fine choice, and certainly no problem in terms of output impedance and drive capability. And thanks for the nice words :-)Best regards,-- Al | |
| Should I Switch Preamps? P.S: It appears that the same impedance compatibility issue might exist in the case of the ARC LS-12. As indicated at arcdb.ws the LS-12 has a recommended minimum load impedance of 10K. The parallel combination of the input impedances of your amp ... | |
| Should I Switch Preamps? Hi Tim,I would recommend against the CJ if you need to run a sub from it, in addition to the main power amp. Not because of the need for a splitter, but because of the impedance issues that are involved.From John Atkinson's measurements: The outp... |