Denon bringing proper mutichannel SACD, and future DVI to these shores

Denon DVD-A11 Look forward to the introduction by Audio Products Australia of the Denon DVD-A11 everything* player this month. Recommended retail price: $3,999. I am drawing here on information about what I take to be the equivalent US model, the Denon DVD-5900.

There are a number of features that are very special about this player. Here I shall mention just two which are dear to my heart. The first is proper support for multichannel SACD. The problem with SACD is that it uses Sony’s Direct Stream Digital (DSD) format. After more than 30 years of fiddling with PCM, there are a host of well-tried systems for processing PCM. But hardly any for DSD. Sony, it seems, has still not seen fit to release a DSD decoder chip for the consumer market that can perform speaker time alignment for multichannel DSD. That means that in the vast majority of surround installations, surround imaging is shot.

But this Denon DVD player appears to offer this. Hurrah! Apparently it gives you an option, though. You can have pure DSD, or you can have it so that ‘DSD signals are converted to PCM’ to enable speaker time alignment, plus variable bass crossover frequency. Better than nothing, for sure.

The other feature worth mentioning is that the DVD-A11/DVD-5900 has a DVI (Digital Video Interface) output to permit a direct, full resolution feed to projectors and the like equipped with DVI inputs. Or, anyway, to ones that support the High-bandwidth Digital Content Protection (HDCP) protocol. Or, anyway, it will in the future. The DVI socket is there, but the promotional literature for the US DVD-5900 says ‘Due to current standards of the DVD Copy Control Association made up of DVD-related companies, output of DVD video images to DVI has not yet been approved. The DVI port on this product at the time of release thus does not function. However, once a standard has been established, an upgrade will be planned to enable use of the DVI port.’ I’m surprised, I thought that DVI had been approved with the use of HDCP.

Despite these qualifications, this looks like it’ll be the DVD player to get!

* By ‘everything’ I mean: DVD Video, DVD Audio, SACD, VCD, SVCD, CD Audio, MP3 on CD-ROM/R, WMA on CD-ROM/R and JPEG pictures on CD-ROM/R.

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Did you know: MP3 is ‘Studio Quality’?

MP3 table Got a chuckle out of this ‘explanation’ of MP3 in the manual of an inexpensive Conia DVD player I’ve been reviewing. Talk about overstating the quality of MP3!

Sure, at 128kb/s MP3 is quite indistinguishable from the CD source for most forms of music, even with good quality equipment. But not all forms. Try, for example, converting some solo harpsichord to MP3 at any bit rate and you’ll hear what I mean: where on a CD the quills pluck the strings forthrightly, producing a bold and crisp attack, and smooth but rapid decay, the harpsichord on MP3 sounds fussy and querulous.

But let us accept that 128kb/s MP3 is, for most music, properly termed ‘near CD quality’, and read this table’s ‘Good CD quality’ as compatible with that. Now what about the other ‘Quality’ ratings in the table? Try encoding some music at just 64kb/s. You do not need to have golden ears to notice how appalling this sounds on all types of music. It is certainly nowhere near ‘FM Radio Quality’, except that at least it doesn’t have its dynamic range compressed like most FM stations.

But the really funny lines are 160kb/s (‘Better than CD Quality’) and up (‘Studio quality’). LOL! Even if MP3 weren’t based on lossy compression, it simply cannot exceed CD quality because it is limited to the same 44.1kHz sampling frequency and 16 bits of resolution as CD’s form of PCM digital.

Posted in Audio, Codecs, Compression, Portable | Leave a comment

New article up – Killer CDs

A superficial reading of the specifications of a CD-ROM drive can generate a fearsome number. The now standard 52x read speed suggests a disc running at 24,000 rpm, with a linear velocity at its edge of over 150m/s (that is, nearly half the speed of sound!)

In this Australian HI-FI article I discuss the likelihood of this causing damage. If you don’t want to read it, the short answer is ‘not likely’. The reason is all to do with the difference between CLV and CAV.

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Calling Virginia!

US Visits MapThe statistics on hifi-writer.com show that the highest volume of visitors, by region, come from North America (not surprisingly, closely followed by Oceania, which is where I am). And for the past couple of weeks the biggest number of visits have come from the Commonwealth of Virginia in the United States. So far this week (ie. since Sunday), they have accounted for one third of North American visitors (55). Who are you? Is Virginia a hotbed of home entertainment freaks? Did you somehow discover that my eldest daughter’s name is Viriginia? Write to me, please, at scdawson at hifi-writer.com. I’m fascinated.

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My Denon DVD-2900 review on-line

The DVD User Group has come to arrangment with Sound and Image magazine to reproduce some of the magazine’s hardware reviews on-line. My review of the Denon DVD-2900 DVD player is now there (you need to become a member — it’s free — then hover over ‘News’ and click on ‘Hardware review’).

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Damping Factor – not as important as I thought

The damping factor of amplifiers is a measure that has fallen out of favour in recent years. Many brands don’t specify it any longer. I had long considered it an important specification, since a low damping factor can lead to frequency response anomalies and poor control over the bass driver in a speaker. But, like an idiot, I failed to take into account that the effective damping factor of an amplifier and speaker system is based on the internal impedance of the amplifier (I knew this), the resistance of the speaker cables (I knew this as well) plus the resistance of the speaker voice coils. It was this last that I had overlooked.

No excuse: the whole thing is explained in an ancient (1967) paper written by George L. Augspurger from James B. Lansing Sound Inc. Read the whole thing.

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Infrasonic squirms

Some experimental types have been working out the effect of infrasonic sound on people’s emotional states. The recipe: take a seven metre long pipe, stick a ‘long throw’ bass driver (woofer) therein a third of the way down, then drive it with a 17 hertz signal. Insert into live performances from time to time, then have the audience complete a questionnaire. Compare their feelings about the music when the infrasonic sound was on with their feelings when it was off. Apparently it had some effect.

I am interested in their infrasonic production apparatus. Not very much information is provided. Presumably the pipe is tuned to resonate at 17 hertz, and I imagine it would be designed to reduce harmonics to the minimum possible. The problem with producing pure bass is the harmonic distortion that is almost always generated. Let us say that the second harmonic is at, say, five per cent of the fundamental frequency (measure some subwoofers and you’ll find that this isn’t an unusual number!) That equates to 26 decibels quieter. But the sensitivity of the human ear drops off very sharply in the extreme bass regions. The Fletcher Munson curves (which attempt to equate the sensitivity of the human ear across the frequency spectrum) suggest a fall-off in sensitivity of as much as twelve decibels per octave in the bass (ie. between 40 and 80 hertz) and this drop-off likely becomes steeper the further into bass one descends. So high levels of distortion can result in audibility of an ‘infrasonic’ tone.

Thanks to my brother Mark for the heads-up. Go visit his Website Images of Canberra to see a stack of wonderful photos of Canberra and environs.

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The CRT projector lives

Barco Cine 7 LTYesterday I finished a review of the Barco Cine 7 LT projector, which should appear in a couple of weeks in the ‘Livewire’ section of The Age newspaper. I had thought that CRT projectors were big, heavy and expensive. The Cine 7 LT is indeed big and heavy, but sells for around the price of the less expensive Mustang-based DLP projectors.

The picture gives a hint as to why they are big and heavy. Three CRT tubes and a huge amount of electronics.

So why did I have it opened up and guts displayed to the world? Well many of the setup features (including such tricky matters as convergence, which can be performed automatically) are accessed through regular setup menus. But the projector’s location isn’t. To set the picture the right way around for ceiling or table-top use, or for front or rear projection, you have to open up that big electronics chassis, pull up to six signal feeds from the board, and re-plug them in the other way around. Fun, eh?

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Australian radio and TV stations

If you want a list of all Australian radio or TV stations, including their frequencies and power outputs, these are available on the Australian Broadcasting Authority Website. In particular, for radio go here, and for TV go here.

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Keeping off the radio

Perhaps it was a mistake, but today I turned down doing a radio interview. Seems someone over in Western Australia had published an article on this most exciting topic: cleaning your hi fi. I had to ask for clarification from the Australian Broadcasting Corporation person who was trying to arrange the interview for some local ‘drive time’ show: do you really mean cleaning, like scrubbing, a stereo? Yes, with Windex and alcohol, I was told.

A million thoughts: first, I almost never clean my gear. Just the odd-dust off when it looks to be getting so thick that heat dissipation is being restricted. Second, every second manual I read has dire warnings about using benzene and so forth on the equipment. I thought I ought to mention that, then realised I don’t really know what benzene is. Then I thought, what if I say to use Windex and it discolours someone’s super-expensive piano-gloss speaker finish?

So, no. Want to talk about the kinds of equipment to buy on a budget? Need expert advice on connecting up and configuring a stereo or home theatre system? Like to hear the pros and cons of DLP vs LCD projectors? Then I’m your man. But cleaning the damned stuff? No way!

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