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About A9X

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    The Adonis of SNA
  • Birthday 01/04/2006

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  1. Damping Factor

    ^^ Well, that was useless. Except as advertising.
  2. Driver excursion

    It's typical in ported speakers. It has the potential to damage drivers with the wrong material and SPL. How you avoid it in normal use I dunno. All ported speakers should have at least a 2nd order HPF set just below tune but very, very few do, typically subs or other active designs; I've personally never seen it in a passive design.
  3. Obviously. I use eutectic for general purpose and on Ag/Au surfaces the 2% often flows better especially in awkward places. I was actually suggesting both with a preference for the former most of the time.
  4. Driver excursion

    What it most likely is, is infrasonic junk present on the recording that is below port tune as driver amplitude is not controlled by the box below tune and excursion increases greatly. Below is a JBL2225 in a ported 75L enclosure. Tune is 40Hz. Note the excursion increase below tune. Signal is constant amplitude with frequency. All ported enclosures do this to some extent so the shape of the curve is roughly the same for all ported speakers. Rustee, according to Stereopiles measurements, your MA S8s are ported at approx 45Hz. Note the dip in the (dark) impedance curve between the two peaks. This indicates tuning frequency for a ported enclosure.
  5. Felix, some tips from someone who was once taught to solder to Mil spec. 1: Buy a decent temp controlled soldering station. 2: Use good solder, eg eutectic 63/37 or similar with maybe 2% silver. This sometimes flows better on plated surfaces. Internal flux, known brand, eg Kester. RS and E14 have a ton of the stuff. 3: Learn how to solder. There are plenty of tutorials on Youtube. 4: Practice. There is almost never a need to touch a surface to be soldered, but a good solder with good flux applied appropriately will remove any skin oils applied.
  6. Nope. Just join and check out the daily update emails and see what's available and if it's worth the money to you. I've bought several pairs of headphones, knives and pens/pencils much cheaper than I can get them locally. I've got some of the HD6XX in transit (just arrived in Oz), and whilst the wait was a couple of months, compared to buying 650's locally they're a bargain.
  7. If they can hear a difference with simply replacing an IEC to mains lead then they'll easily be able to show an audibly significant difference in measured output of the DUT as it's very, very easy to measure far better than any human can hear. So, rather than argumentum ad verecundiam, show us the data. Most of what you've been discussing in this thread revolves around dedicated earthing systems for custom installations which is completely irrelevant to a typical domestic abode here (which must follow AS3000).
  8. Weakest Link(s) in the Audio Chain?

    Jitter hasn't been an issue for a long time so it's irrelevant. You can thank wifi for that. The only other example I can see of a dynamically rising noise floor is in a SET amp with complex music; all that amusical IMD brought about by a shocking non linear transfer function.
  9. Weakest Link(s) in the Audio Chain?

    Even a CDP101 DAC measures far better than any speaker.
  10. Weakest Link(s) in the Audio Chain?

    Sighted test no doubt, so irrelevant as for as I'm concerned. Oh, and if the other member there is an EE Hons, then he'll have no trouble explaining why yhere were perceived differences, and showing audibly significant measurement differences at the outputs of the DUT. This comment simply shows you don't understand what Bob was doing. He showed, a very well known fact, that two amplifiers with the same transfer function will sound identical. So, ho took his very linear unit and gave it a poorer transfer function to match the CJ Premiers he had. Adjusted by nulling IIRC. Funny that the sighted subjectivist test shows apparent audible differences, but objective testing such as Cy Brennemans work doesn't. I'm willing to change my position with some actual evidence, but after all these years all I've seen is anecdote. With the ability to measure far, far better than any human could possibly hear being fairly cheap and available you'd think there'd be good sets of repeatable measurements to back up these "totally obvious unsubtle changes" but there never is. Audiophiles so often remind me of cryptozoologists.
  11. Wilson use something similar, but I've yet to see any evidence that it's better than well braced MDF/ply. As I've mentioned before, I've had 2 x FTW21 21" sub drivers (not opposed) in a 400L well braced MDF box and couldn't feel any vibrations. And I should know, I used it as a foot rest. Seems to me in audiophilia, everyone wants to try the exotic/extreme method before working with basic engineering methods that actually work.
  12. To sub or not to sub

    Are you suggesting x-ing to the sub at the mains tuning? Because of the phase it makes it difficult; as most floorstanders are tuned around 40Hz, X at 80Hz and you effectively have a sealed speaker as the port will receive no signal (with a suitable, and necessary HPF). A MiniDSP is much more powerful, flexible and cheaper. As for the McGowan video, what a load of tripe. With cheap and very powerful tools available today, it's a foolish punter that doesn't take advantage of them. Suggesting tuning by ear is simply bollocks as our hearing is particularly poor that low, you can't differentiate modes, especially nulls so it's impossible to really tell what you're actually hearing. PSA have had little cred with me, and after this dross, none at all.
  13. Weakest Link(s) in the Audio Chain?

    Oh, definitely. Ignoring the room and just looking at the non linear distortion of the various components; a very good speaker driver had THD in the order of -50dB. A really crap modern DAC is >-110dB. SS amps are regularly >-100dB. Non stupid (without boxes or batteries etc) cables should be almost immeasurable. So just this one aspect shows speakers are by far the weakest link, and that's before factoring in diffraction, time alignment, polar patterns (H&V) or their effects at the MLP when actually placed in a room. Not really.
  14. Boxes are easy especially if simple rectangular designs. Do you have any relos/friends into woodworking? If so, enlist some help. I'll admit I hadn't heard of that one. Do you remember where you got the measurements as I'm curious. Might be a cheaper solution for some of the large (L/R + surrounds) boxes I have coming. As for subs I've found adequate bracing is all that's needed even on very large boxes, like my 400L (four hundred litre) sub enclosures. Sergio; it's your money, so spend it how you want, but when I see something that's not going to work, I'm going to comment so others don't go down the same path uninformed.
  15. Weakest Link(s) in the Audio Chain?

    I've grown to love cans again. I got some AKG K7xx (x2, Supertex HD688, HE350 and Senn HD6xx - still waiting on these), and a cheap second hand Aune headphone amp and it's fantastic. I was sick last week and stayed in bed and had a 24hr movie watching session (closer to the bathroom) with no fatigue issues at all. Also means I can listen at whatever volume at whatever time without annoying the neighbours.