Jump to content


  • Content count

  • Joined

  • Last visited

About A9X

  • Rank
    The Adonis of SNA
  • Birthday 04/01/2006

Profile Fields

  • Location
  • Country

Recent Profile Visitors

2,702 profile views
  1. Weakest Link(s) in the Audio Chain?

    Even a CDP101 DAC measures far better than any speaker.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. No because it has no dampening capability whatsoever, whereas the two alternatives I suggested actually do. WRT to the 'have you tried it argument' I also don't need to hit myself in the head with a brick to know it will hurt.
  9. ^^ Dynamat or mineral loaded vinyl would have worked better for considerably less money.
  10. To what possible electrical or mechanical benefit?
  11. To sub or not to sub

    Glad you found it some help. Jerry (AustinJerry on AVS) put it together and updates it regularly. When you get it all set up, I'm sure he'd love an 'attaboy'. There are pluses and minuses to both. If you find a spot for the sub and it causes a floor resonance, that's easy to solve with some hardwood and bricks, providing you can get under the floor. I basically agree with Joe, but find integration to be the main issue. It requires MEASUREMENT to get it right. I have a mic, preamp, stand cables etc I can usually loan out if you're in Sydney. Sometimes I can even help.
  12. With adequate bracing, think B&W Matrix style on 200mm centres, MDF will sound no different to ply. If the drivers are the PSA units, without specs or the ability to measure them, simply clone how they're sold retail as complete subs. Thicker does not mean stiffer. Simple mechanical engineering. I have 2 FTW21 in heavily braced 18mm MDF and there are now vibrations on the enclosures. Bracing is the key; see above.
  13. Damping Factor

    It's really basic EE. Google them, they shouldn't be too hard to find. Not that I've seen.
  14. I think you're wasting your money if you expect to get some actual audible sonic benefit. However, I have a number of Tortech transformers and inductors in my system and their build quality is first rate. Very good to deal with too. I work in the network so I deal with transformer measurements and quality on a daily basis.
  15. The change from 240V +/- 5% was a paper one only. Nothing in the network changed. All they did was move the tolerances to +10/-2% and the nominal to 230 from 240V.