Edgar
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Posts posted by Edgar
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9 hours ago, ClaudeJ1 said:
80% excursion, yes. Too much of a good thing before posting hastily.
Yes; sine waves at 80% rated power for 10 minutes would have the police visiting what was left of your house. 😀
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47 minutes ago, ClaudeJ1 said:
Joking aside, using a sine wave signal at 80% rated power should break in a woofer in about 10 minutes or less.
@ClaudeJ1, did you intend to say 80% rated power or 80% max excursion?
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8 hours ago, geezin' said:
Ah the single life...Harleys,faster Italian bikes,sportscars,guns,$800 fly rods and big dogs roaming around the house with a distinct lack of bitching. WAF? WTF is that? 63 blissful years so far.
"To a person who lives their entire life alone, old age comes as a complete surprise."
- Edgar (also in my 63rd year as a single)
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2 minutes ago, Schu said:
... and i dont think it is any of the amplification because none of the left side is working and my LF and HF are being driven by two different amps. so that really leaves the xilica.
Well, the Xilica is programmable ... is there an inadvertent channel sum or reversal somewhere in the configuration?
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Just now, Schu said:
not advisable to run the system without a volume control...
No, but for an experiment like this you could even use the headphone output from your phone as a source.
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Try this (never make or break connections while the amp is powered):
- Keep the right channel connection from the preamp to the amp, but disconnect the cable from the left channel output of the preamp to the left channel input of the amp completely. You should hear loud sound from the right speaker, and possibly very low-level crosstalk from the left speaker.
- Reconnect the left channel output from the preamp to the left channel input of the amp. Disconnect the right channel output of the preamp to the right channel input of the amp. You should hear loud sound from the left speaker, and possibly very low-level crosstalk from the right speaker.
If both of these work as I stated, then the problem is not in your amp.
To eliminate the preamp as a possibility, do as @CWOReilly says, above.
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37 minutes ago, Schu said:
HOWEVER, why would the right channel continue to play when I plug the right output into the left channel output? that to me means that maybe something is 'summing' both channels into the right channel.
Plugging the right output into the left output? I'm sorry, but I'm still not following what is happening here.
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1 hour ago, Schu said:
here is the interesting part... if I swap the out put from my preamp to the xilica, the sound still only comes from the right speaker, even if the right side is unplugged at the pre.
the same issue persists if I swap the input or the output from the DAC. I think this means the preamp has an issue... I think.
I'm having difficulty understanding exactly what you mean in the statements above, but overall what I think you are hearing from the left channel is crosstalk from the right channel. That means that the left channel input on your amp is no longer connected to the left channel output in your amp. That might mean that some component in the left channel low-level signal path has failed.
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26 minutes ago, Dave A said:
OK would those go in after the L-Pad?
Yes. I typically mount them directly to the driver terminals. That way everything upstream of the driver (and Zobel) see nearly constant impedance.
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46 minutes ago, Dave A said:
... has anyone else tried this?
Absolutely! For my last crossover I measured dozens of capacitors, inductors, and resistors. (At one point I even contemplated winding my own inductors, but it turned out that I had appropriate values on-hand.) I fine-tuned with SPICE simulation. My results agreed with yours.
If you really want to put the final touch on your results, implement Zobel networks, too.
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2 minutes ago, Klipschguy said:
So, the high frequencies from the 8 ohm driver will effectively have 6dB more SPL relative to the 16 ohm driver (3dB more mid attenuation plus 3dB more sensitivity from the lower 8 ohm impedance)?
Assuming that the 8 Ohm driver will be 3 dB more sensitive than the 16 Ohm driver may or may not be valid -- you'd have to check with Altec or GPA about that.
If the assumption is valid, then for the same voltage input to the circuit, below 1 kHz both drivers will have the same acoustic output -- 3 dB more attenuation in the circuit compensated by 3 dB more sensitivity in the driver. At 20 kHz, where both versions have about the same voltage output regardless of the driver impedance, the 8 Ohm driver will be 3 dB louder than the 16 Ohm driver.
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13 minutes ago, Klipschguy said:
Yes exactly! Are these circuits impedance dependent?
Well, yes. The 8 Ohm version has 3 dB more attenuation below 1 kHz than the 16 Ohm version.
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3 minutes ago, Klipschguy said:
P.S. Edgar, thank you most kindly for taking time to run the curves; I am not sure what think yet. Please know I am not doubting, it just doesn’t seem to make sense Altec would design an attenuuation circuit that doesn’t continuate. It’s kinda like having a machine that goes “ping” but nothing else.
Looks more like a HF horn driver compensation circuit. HF response starts to roll-off at some high frequency due to mass reactance. Boosting the highs (or attenuating the lows) in the HF circuit compensates for that. Some horns compensate by collapsing the coverage angle in favor of the on-axis response, in which case the circuit is not needed.
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There is no notch filter in that circuit.
SPICE simulations using 8 Ohm and 16 Ohm resistive for HF:
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21 minutes ago, Schu said:
It's all about battery power
Yes. Then we can discuss the merits of gold-plated, cryogenically-treated, oxygen-free, aligned with the earth's magnetic field, demon-exorcised, audiophile-approved battery technologies.
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Eliminate the cryo breaker. Eliminate the audiphile socket and line cord. Run everything off of DC.
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33 minutes ago, geoff. said:
Now we can hash out the digital vs. analogue debate, lol
Yeah, sorry, that was a bit out of context, but it wasn't intentional. I was just comparing my reaction with that of @Dave A, and threw-in a little too much information.
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16 minutes ago, Dave A said:
With music here sometimes the hair stands straight up on your arm or shivers run up and down your spine.
For me it's the hair on the back of my neck. It took a long time before digital sources could make that happen, while good vinyl could do it regularly. As my system, and digital recording, have improved over the years, I've found that digital can do it, too.
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59 minutes ago, Marvel said:
You mean the difference between AC/DC and the Atlanta Symphony Orchestra?
No, I meant the degree to which they care about what they hear, not about what they listen to. 😉
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2 minutes ago, Dave A said:
How does one get golden ears anyway? Is there a course on this or is it natural ability?
I have found that most people hear pretty well, once taught what to listen for. What really distinguishes audiophiles from non-audiophiles is the degree to which they care about what they hear.
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Just now, Dave A said:
... I have had fun over there at times poking the pretentious with my fine zip cord cable management and Crown XLI trash commercial amps that I so arrogantly claim are worth while.
A few years ago I had a job interview at Harman. I got to speak with their chief amplifier designer, so I asked him what he does differently when designing a consumer amp for Harman Kardon vs. a pro amp for Crown vs. an audiophile amp for Mark Levinson. He answered that the circuits were the same, he would just choose parts that were appropriate for each application -- e.g., 1% resistors for Levinson vs. 5% for Harman Kardon, bigger heat sinks for Crown, etc.
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Just now, Shakeydeal said:
I'd actually label it rather mundane.
"Mundane claims require mundane evidence."
Rarely is there any evidence at all, save for claims of either extraordinary hearing abilities or extraordinary equipment.
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5 hours ago, Rolox said:
Go ahead, mock me, make a fool of me, I won't change my mind about it.
And the subjectivists accuse the objectivists of being "closed-minded"?
Everyone is free to believe whatever they want. Just don't present opinion as fact.
"Extraordinary claims require extraordinary evidence." - Carl Sagan
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The Jubilee are in the house!
in 2-Channel Home Audio
Posted
Good advice in so many circumstances ...