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scumbag

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scumbag last won the day on April 2 2017

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About scumbag

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    Brisbane
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    Australia
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    Mark (or Scum) whatever you prefer.

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  1. Item: Luxman Line Selector AS-4 III Location: Brisbane Price: $100 including postage Item Condition: Excellent, as new. Still have box. Reason for selling: Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: I bought this to do some experimenting with cables into my power amp' and I'm happy to move it on now. Officially it can be used as either 4 inputs and one out, or perhaps one input and a choice of 4 out. However, I have also found that you can sneakily push 2 adjacent buttons down to get 1 in 2 out if you want (for bi-amping?). Was purchased as NOS from a Melbourne HiFi dealer by the original purchaser and has been used lightly by myself several times since I got it. Very transparent in operation. http://jeffsplace.me/wordpress/?p=12738 http://www.ebay.com/sch/i.html?_nkw=luxman+line+selector+as-4iii&ul_noapp=true Pictures:
  2. If anyone misses out, I have a Wyrd that I am looking to put up on the classifieds. Excellent condition, in box. PM me (buy only once both units are confirmed sold as I do not want to gazump the OP).
  3. scumbag

    EOI: PS Audio BHK Preamp

    I love my BHP preamp. She's a keeper (for me!).
  4. Piccies as promised: Solid copper "Gaofei" spades. These are really good quality - they really are solid red copper so there's no "alloy" at use in them. You're getting an unimpeded a conduit between the speaker wire and your speaker terminals. As per the photo below, previously the "pants" extended right up to the base of the banana plugs which made the legs nice and thick but did affect their flexibility. The new "legs" don't look quite as neat or chunky but are quite pliable now.
  5. scumbag

    Let's talk jitter.

    Is it possible he's actually basing his story on his experience? He did state that he deliberately made different amplifier that were tuned to five predominantly 2nd or 3rd order distortions. One assumes he did this to gain insight into the tastes of customers. And is course its a generalisation. I don't see how pointlng out the obvious somehow reduces the value of his observations. I'm getting sick of the level of cynicism in these forums. Nelson pass makes nice stories and Ted Smith probably writes reviews about beebees. Those are the comments made on this very thread. Cheap throwaway lines that the author feels deals some critical blow to a statement that hints at a position that they don't agree with. It seems that everyone has to have an angle. No one seems to reach the necessary standards of the keyboard warriers no matter what their training, experience or considerable achievements. I am out of this discussion and I'm not going to contribute to any discussions on the great audio 'debate' from now on. It's a waste of energy.
  6. Item: 'Fixed' Aurealis OCC Copper UP320e 3.5m speaker cables pair Location: Brisbane Price: $270 including post. Item Condition: Excellent Reason for selling: Tried them. Like them. Going to diy a variation of these to my specifications. Payment Method: Pickup - Cash or Paypal, postage paypal only. Extra Info: I bought these recently as I wanted to experiment with opocc (ohno long crystal copper) having read a bit about the process used to make the copper and the benefits to the sound that this can bring. They are also solid core rather than stranded conductors. I can report that these cables are detailed with a nice hint of warmth. Excellent bass too. Very highly recommended. Geoff knows his stuff. An excellent length too! I am going to try some DIY OPOCC cables next as these have inspired me. The banana plugs that came with the cables were in bad shape and one had snapped. I believe this is an issue where any weight on the plugs causes them to bend and eventually fail and the banana plug manufacturer has updated their website to suggest this. I replaced them with some nice solid red copper spades at both ends. I also modified the boots to make the ends more pliable. They look really nice now. Pictures: To follow tomorrow.
  7. scumbag

    Let's talk jitter.

    I was trying to find this article on my phone whilst interstate over the last few days. I've found it now that I'm back at my desktop: http://www.audiophilleo.com/zh_hk/docs/Dunn-AP-tn23.pdf So just going back to my point regarding Jitter and "gain" in dB, what is your understanding of the statement: "Notice that below the PLL corner, the gain reaches a peak of about 0.5 dB. It is usual for there to be a certain amount of gain just below the corner frequency; this is called jitter peaking and it is a consequence of the phase characteristic of the feedback loop in the PLL. The AES3 standard sets an upper limit of +2 dB for jitter gain." I'm genuinely trying to understand this. The AES3 standards have been around since the advent of digital recording devices. I guess the question is, does the term "jitter gain" mean a rise in the output of the device at a given frequency as a result of the action of the feedback loop in the PLL
  8. Item: Wireworld Equinox 7 XLR interconnect - 1m pair Location: Brisbane Price: $220 including post RRP $338 in AUS plus postage Item Condition: New in box Reason for selling: Not required. I went a bit nuts buying cables a while ago. Payment Method: Pickup - Cash or Paypal. Postage = Paypal only (as a friend or add 3%) Extra Info: I haven't listened to this cable but I have owned a few Wireworld cables. I characterise their sound as detailed and balanced. As you work your way up the price range, detail goes up and extension seems to push out on either end of the frequency extreme. The Equinox sits 5th from the top of the WIrewold range (and as you go much higher than this the prices really jump up!) but it is the first one in their range to use 7N OCC copper which in my experience brings great amounts of grain free detail and a hint of warmth. Connectors are pressure welded and contain OFC with silver plating (a lot of XLR connectors of some quite expensive cables are not pure copper). I have read reviews that place this cable as being very competitive with cables in the same or slightly higher price range. DESIGN Quad DNA Helix SIGNAL CONDUCTORS Qty: 4 | Gauge: 21AWG | 0.4 sq. mm CONDUCTOR MATERIAL 7N OCC Copper INSULATION Composilex 2 PLUG CONTACTS Silver-clad OFC Pictures:
  9. Item: Zu Audio Mission interconnect PAIR 1m XLR. Location: Brisbane Price: $110 including postage Item Condition: New. Sealed in packaging. Reason for selling: Selling for a mate. Payment Method: Pickup - Cash or Paypal . Postage = Paypal (as a friend or add 3%) Extra Info: I owned a set of these cables a few years ago. My memory of them is that they are very neutral. They will pass the signal from your amplifier without imparting a tonal "tilt". The construction is actually very sophisticated and they are well made. Superb value at this price. https://positive-feedback.com/Issue55/zu_mission.htm Pure copper spades each end. Pictures:
  10. Item: Zu Audio Mission 1 speaker cable PAIR 2.5m Spades Location: Brisbane Price: $190 including postage Item Condition: New. Sealed in packaging. Reason for selling: Selling for a mate. Payment Method: Pickup - Cash or Paypal . Postage = Paypal (as a friend or add 3%) Extra Info: I owned a set of these cables a few years ago. My memory of them is that they are very neutral. They will pass the signal from your amplifier without imparting a tonal "tilt". The construction is actually very sophisticated and they are well made. Superb value at this price. https://positive-feedback.com/Issue55/zu_mission.htm Pure copper spades each end. Pictures:
  11. Ben, you know you want them. Why delay the inevitable?
  12. scumbag

    Let's talk jitter.

    The article that Nelson Pass wrote up has some interesting comments later on about the accumulative effects of distortion on the output of an amplifier. The article is talking about feedback though - that's the full context of the article. "We have seen that nonlinear distortion becomes larger and more complex depending on the nonlinear characteristic of the stages, the number of cascaded stages, and the number of spectral elements in the music. Negative feedback can reduce the total quantity of distortion, but it adds new components on its own, and tempts the designer to use more cascaded gain stages in search of better numbers, accompanied by greater feedback frequency stability issues. The resulting complexity creates distortion which is unlike the simple harmonics associated with musical instruments, and we see that these complex waves can gather to create the occasional tsunami of distortion, peaking at values far above those imagined by the distortion specifications. If you want the peak distortion of the circuit of figure 13 to remain below .1% with a complex signal, then you need to reduce it by a factor of about 3000. 70 dB of feedback would do it, but that does seems like a lot. By contrast, it appears that if you can make a single stage operate at .01% 2nd harmonic with a single tone without feedback, you could also achieve the .1% peak in the complex IM test."
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