Clives Reviews
Clive has been a long time supporter of Eastwoood HiFi
and consequently gets the occasional nod from Steve to be able to take home
various goodies to play with. As a longtime music fanatic with over a zillion
CD's and SACD's hidden away in the vaults, we know of no one more qualified to
assess the ability of sound reproduction equipment objectively. Having been the
morning presenter on ABC FM, Clive's knowledge of Classical music is
encyclopedic although he also has a penchant for Deep Purple, Eric Clapton and
other icons of the 60's and 70's. Here are some of his musings -
DAB Review 26/11/2009

DAB+ and all that Jazz
The Cambridge Azure 650t
I work in the radio industry. I am here because I didn’t actually co-operate at school.
I was the one who stared out the window, variously at the flies buzzing around the flyscreen, and at the horizon – I was always fascinated by the horizon. It seemed so far away. So apart from these distractions, and making railway tracks on my "Trueline School Ruler" with the old HB, the rest of scholastic life was a mystery. And, if I had my life all over again, knowing what I know now, I would have used a pencil with a much harder tip to make the railway-lines. And I would still have stared out the window at infinity. So much for learning life’s lessons.
Anyway, whilst working in radio and television, it has been the technical side which has fascinated me probably more than the production of millions of probably irrelevant words from me and from those I harassed. Words, which are still travelling through space, ready to assail the ears of some other alien who is probably making railway-lines in his school rule, and staring at the horizon (which could possibly be our Earth).
I grew up with the big old radios that took 30 seconds to warm up and which sat pompously in large cabinets that could be not ignored. They, of course, did not remain in their cabinets.
I remember, in 1958, getting my own radio. It was a grand day, and as soon as I cleared my crappy bedside table, I (naturally) proceeded to remove the noisy warm device from its cabinet. It’s what one did. This removal operation showed the glowing rectifier valve, the output valve with its exposed anode, and the intricacies of the strings to guide the little pointer along the dial so you knew where you were. All the states of Australia were shown, and I would see twos, threes, fours, fives, sixes and sevens and I always wondered what these other stations were doing, and, occasionally, when the conditions were right, I picked up transmitters from a far distant place. It was sort of an electronic horizon.
This was fun. Fun, until my mother accidently touched the anode on one of the valves (300volts) and indicated that it was rather unpleasant, and that I would be punished, and why would anyone tale the cover of a radio, and it looked ugly, and what was wrong with me, and why couldn’t I be nice, and now go to your room. My room, of course, was where the radio was. Her logic was a little flawed.
Radio was my friend, and I soon discovered the world of short-wave, and one could hear odd-bods from all around the world talking with enthusiasm. A lot of them made no sense at all, but I remember using my old HB and a school note-book to write down when and where I heard what. It became a bit of an obsession
, and, despite the diminishing number of stations transmitting around the world nowadays, my short-wave radio is still in earshot. There is a magic in them there waves.When I was called up to fight the Vietnam War, back in ’65, and I actually protested, (saying that going in the army was not a passion of mine, and that it was rather inconvenient, and could I get back to them?). I was then sent to an army psychiatrist who tried to fathom out why I didn’t want to give up my job to go to a foreign place and attempt to kill people I didn’t actually know. But, it was when I said that I went to sleep with the radio on that he wrote about three pages of notes. A few months later they decided that the army did not need me at this time. I found out, some years later, that the psychiatrist decided that I was emotionally ill-equipped to kill people. But all I could think was that the radio served me well.
Who would have though that falling asleep to the sounds of the wireless was so significant ? I listened to the radio because I liked listening to the radio-not to get out of a war
. But don’t tell him that.Things have changed, a little, since then. That is, they have changed, I have not.
Digital radio has been around for quite awhile (in Sydney, at least). I was one of the few people in this country who promoted it because it was (technically) capable of lovely things. DAB (no ‘plus’) did some good things, except the government decided that tests would be conducted by two groups, one in Sydney, and Melbourne.
Now, here was a wheel that did not need re-inventing; it was alive and well in the U.K, and despite abysmally-low bit-rates, it was viable. But it did seem that keeping bit-rates low would lead to its self-destruction. And, having two lots of people testing the thing in Australia was probably not a good idea, and it was really just wasting time. Life is short, and the horizon is looming for all of us
. But, I had DAB tuners, and life was good, providing they kept the bit-rates up.Then, a little while ago, DAB+ was announced. I rang Mr Kneel ("we’re not worthy, we’re not worthy"), and obtained one of the first Sangean machines he had. Lovely. But DAB+ was even lovelier then than the way things are now. Why ?
They were testing (again), and I remember one afternoon listening to my old Paradigm speakers through the Cambridge amp at a wonderful transmission of MPEG2, at 192 kbs. I had never heard anythink like it, away from a cd. Wonderful ! I spoke to technical Al at my place of work and commented on the sound. Well, MPEG2 at 192 came and went, and the next thing I knew was AAC was the standard, at a maximum of 124 kbs. This maximum would include transmitted pictures, so the audio bit-rate would be obviously,less. Not the big bit-rate I would have drooled at
The other problem seemed to be (if not the main impediment) that the DAB+ signals are in the analogue television band. So, in theory, when tv is ultimately only digital, that part of the band (circa 200 megahurtles) could be allocated solely to DAB+, and the restriction on audio band-with could be lifted. So, in theory, wider audio could be transmitted on whatever codec was deemed the best at the time.
I would say that the chances of analogue tv disappearing soon is as likely as the government declaring that no-one can burn wood in their fires at home to keep warm. Getting cold pensioners off
- side by freezing them to death would not garner many votes. And if those same pensioners can’t find anything on their old analogue television sets , they might not feel terribly charitable towards any government. Anyway, it could happen. It’s on the horizon.So, I rang Mr. Kneel again, and said I heard that Cambridge were doing an FM/AM/DAB+ tuner, and was he aware of it. He said that he was, and I placed an order, and the Azure 650t arrived from over the horizon a week later in typically Cambridge minimalist packaging
.Now, I’ve had the Cambridge Azure 340t FM tuner for awhile, and it is excellent, providing you have an fm-antenna (cheap), if you have no multi-path (reflections), and if you have a decent amplifier. And (wait for it) if the audio source is good. FM can sound great. CD can sound great, DAT can sound great, Mini-disc can sound great, AM radio can sound great, DAB can sound great, DAB+ can sound great. It all depends on the audio source.
I connected the the little wire antenna to the Azure 650t’s DAB+ input, looped it around my lovely painting of a WAGR "V" class locomotive picture (probably the best-looking locomotive in Australia), and turned the device on. I received full bars on the signal strength thingy. The antenna is not a complicated device for DAB+. I connected my FM antenna, and a small loop (Sony) to the am inputs. I then made a cup of tea. Amplifiers and the attachments always seem better when they’ve warmed up.
Now, it’s hard to actually compare DAB+ to FM. It’s a bit like comparing a mango and an apple straight off the tree. They are both good, but, obviously different
.DAB+ has a great advantage of being quiet. When you hear someone speaking, and they stop, you hear nothing, except the odd hum from the studio. When you listen to Beethoven’s Symphony No. 2, you are merely aware of the atmosphere of the hall between tracks. The clever people who analyse sound have produced codecs that cheat a little. But our ears, and our perceptions are not laboratory instruments.
I remember recording a steam engine at the Zig-Zag Railway at Lithgow in NSW many years ago, and the safety-valve went off. When I got to the motel, I noticed there was a lot of distortion in the recording. I went back the next day, sans recorder, and stood in the same spot. The distortion was still there – my ears just couldn’t cope. The failing was in my ears, not the recording . We are finite creatures. We hear what we hear. So, clever people look at these things and throw away the bits (sections) that we don’t need, and produce smaller, but effective files.
If you listen to a well-recorded studio-tape, or a SACD, you’ve heard the best. A live recording is not necessarily so good. FM (with all the caveats above) can sound great. DAB+ can also sound great. Even at lower bit-rates, speech can work wonderfully at 48kbs.
So, is DAB+ worth it ? Yes, yes, yes. The Cambridge machine works wonderfully. I just wish they would have a VGA-out so that one could put any transmitted pictures on, say a television. The information is there, somewhere in the box.
The Cambridge also has a SPDIF out, so you can record direct to a computer via a digital soundcard, should you have permission from the record company and the artist so to do
.Oh, there is one
down-side. AM radio was always good at detecting approaching
thunderstorms. DAB+ is no such help. Thank goodness they
included an am tuner.
Go for it.
http://www.digitalradioplus.com.au/
Clive Robertson (spinster of this parish). November 2009
Review 11/7/2008
Cambridge Audio – Clive Robertson has a play.
Every now and then I’m pleased to borrow some nice hi-fi gear from Mr. Neil, when he’s feeling generous or when I’m looking particularly disheveled , or more-than-usually pathetic. It’s probably his way of getting me out of the shop before anyone else actually sees me.
Well, there’s been quite a pile of demonstrator/as-new/whatever boxes of Cambridge Audio piled neatly in his shop, so he suggested I try them out; no point risking me with something actually brand-new. I’m new to Cambridge, so I thought it was a reasonable idea. I hired a small semi-trailer.
When I arrived, the top amplifier, the “Azur 840A (Version 2)” in black was humming along, precariously sitting on top of some source. Each of these bits of aural fun are tested by the likely lads at his shop, after which an almost illegible note is attached to the box outside like “slight scratch on back”, “ok”, “as knew” and other little yellow observations, which actually add up to a good way to buy stuff – as new, and tested, and cheaper-than-new. A bit like Ebay, but here you actually get to see the goods, and they actually have serial numbers.
The 840A was packed in a Yamaha box (don’t ask), and, along with various other devices in blue and white containers, I headed for home.
This week, I’ll tell you about listening to the 840A and Cambridge Audio’s am/fm tuner. To simply talk about an amplifier without some source is a bit of a mute point. Ha ha.
Unpacking is always fun, and I plugged the solid 840A into my old faithful Paradigm 100s, found my fm antenna plug, and connected everything together. Of course, I didn’t read the manuals, because life should always be an adventure. After a small period of time, nice noises appeared.
Before I go on, I really must recommend the external fm antenna. The difference between “rabbit’s ears” (poor rabbit), and a good 75 ohm run from an external fm antenna makes all the difference. You stick it up like a tv antenna, point it towards the station you want, and the result is generally a stronger signal, and, with luck, less multipath distortion. It’s really worth the effort. You will also get a good view of your neighbours’ yards, so taking some discreet (or not) photos means the day was not at all wasted.
So, in went the fm antenna into the Cambridge Azur 340T and I tuned to a community station that I knew that used minimal signal processing. I pressed the direct button on the amp and went and made a cuppa. One waits for everything to warm up. I returned, managing to spill two-thirds of the tea onto my trousers. As I looked down I wondered why living on this earth was so imperfect.
Well, the Azure 840 drove the Paradigms unlike any other amplifier I had tried. I soon forgot about sitting in a puddle, and closed my eyes, and listened to the music. I could only agree with the reviews I had read re these Amps (and, indeed, the Paradigm speakers) and I was not disappointed. I kept thinking (as one does) how they could be better, but, ultimately I wanted to hear the music, not the specifications, and I was not aware of anything annoying, or missing. I actually doubt that I would ever need more than what this amp provided. My old amplifier sat in the corner, staring at me like some jilted lover.
Of course ( I hear you cry), an fm audio signal is not the ultimate listening source, and you are quite right. Next time, I’ll tell you how the Azur 840c (cd player) mates with the amp.
I am very impressed with the Amp. I am less impressed with having to hand it back.
If you have any hearing left after listening to your .mp3 player, you’ll be amazed at the Azur 840A. Music should, after all, be listened to professionally – it’s not really a game.
I have to go now, for a change of clothes and a sneak listen to Haitink’s conducting of Shostakovich’s Symphony Number Five, and then “Dark side of the Moon”.
Next time, it’ll be the 840a and the 840c combination. I might skip the tea.
For now, it’s back to the central commentary position, and Steve Neil.
Part two (28/7/2008)
After fiddling with the FM stations and their collective amateurism and occasional professionalism, I connected the Cambridge Azur 840C compact disc player. This matched the Cambridge Azur 840A amplifier in looks and size. Mr. Kneel (“we’re not worthy, we’re not worthy”) lent me a pair of Cambridge xlr connectors for the beasties. You have to have the amp and player quite close because some loony at the Cambridge factory just doesn’t get the concept of balanced inputs, and they decided to make the cables really short. Reflecting on the fm observation trials in part one, using balanced cables at a radio station tends to negate electrical noise. A lot of the amateur fm stations seem not to use them, so that’s why we are all kept amused by the sounds of the morons on air ringing their mates on their mobile phones cajoling them to listen, with the resultant chirping noises from their mobiles phones leaking through on air. I don’t complain; they amuse me; it’s often the best part of the show.
Anyway, as you have gleaned, Cambridge should have made the cables longer. Do not be tempted to put the CD player actually on top of the amp, or vice-versa. Heated arguments might follow.
The cod player “does” up sampling, much as a lot of DVD players tend to do. But this up samples a lot. When I finished listening, I had to vacuum-clean the lounge – there were bits everywhere. Ha ha.
The sound was fabulous. Just terrific. I’ve heard SACD in the past (what an experience!), and, in a darkened room, if someone had said “here’s my latest SACD”, and played a good cd on the 840C, I would have believed them. It was that good.
But then, I heard a fault. I put on a favourite orchestral recording, and heard intermittent noises amongst the musical notes. I was about to ring Mr. Kneel (“we’re not worthy…”) when I rewound the cd and heard the same spurii in the same places. I beamed; it was the sound of the musicians turning the page. I had never heard them do that before. I suppose they have to.
So, the reviewers were actually right. The up sampling “thing” seems to work (whatever), but, since the idea of sitting there was to actually hear the music and not just look at the silver boxes, I found the sound was gorgeous, detailed, refined and a real pleasure to listen to. The idea, after all, is to absorb to the music, not collect three-dimensional boxes with little lights and knobs on them with labels underneath that are far too small to read.
Now, the common denominator in these subjective tests has been the speakers, and the environment. The speakers were the Paradigm 100s. The environment is the tricky bit. It’s not easy to changed.
So, I rang a mate of mine who had a pair of 20-year-old Stax electrostatic headphones with an accompanying valve amplifier. This would take the speakers and the environment out of the tests. Never heard electrostatic headphones ? Never kissed a girl ? They’re sort of in the same league.
I waited the usual half-hour for all the audio bits to get to know each other, and then put some Quincy Jones on.
I doubt if I will ever hear a better sound from an ordinary cd. One could happily super-glue the headphones onto one’s head and simply die there. It was superlative. I temporarily forgot about Jennifer Aniston.
I sat there for many hours, hearing every note, every bus that went by the recording studio, lots of performers breathing, some edits, some changes in equalization, but, above all, I heard the music, and my collection of cds, going back to 1982, beamed at me. Our relationship was secure; it was apparently me, not them.
Back to the speakers – would I now discard them, would they disappoint, after the electrostatics? No. Not at all. They’re two different things, but both musical in their own ways. Anyway, wearing headphones was a little like being back at work.
Cambridge Azur 840a + Azur 840c ? Ten thumbs up.
Nice. Life is short.
The phone rang. My answer machine responded. It was Mr. Kneel, saying he had a buyer for the amp, and could I drop it around to him that afternoon, and telling me what a bastard I was, and I’m wasting my time on radio, and had I heard the new Steely Dan disc? And was I actually there ? You know, the usual thing.
I boxed the gear up, and cried a little.
Steely Dan would have sounded great.

