Aussie amplifiers spec seems better than Bryston - diyAudio
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Old 14th December 2008, 04:58 AM   #1
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Default Aussie amplifiers spec seems better than Bryston

I would like to compare the Aussie amps with the Brystons like in terms of many factors where I think Aussie amps are better

especially Halton series have very pristine features like
http://www.aussieamplifiers.com/nxv300.htm

1. Everything is SMD which is really good for signal
2. Elna Carafine and SLIMIC caps for best possible caps ( i think even brystons dont use these )
3. SNR is -120db which is extraordinary where as brystons have 110db
4.Damping factor ( 750 ) is double than that of Brystons.. ( which tempts me where it can hold the drivers tightly )
5. Freq Resp 3.5hz to 300khz -3dB
6. Power supply Rejection ratio is 115db ( which is also top notch )
7.Stable even at 2 ohms which even Brystons cant...
8. Custom built power supply ( where I can add as much capacitance as possible Im thinking of 60,000ufd per channel
9. Massive heatsink as required... Im thinking to get the chasis built by some Aluminium extrusions companies at my place where I can get better looking chasis.
10. Overall its very cost effective and as well as better performing amp..

so Im finally thinking to go with the Aussie amps rather than Brystons.. can anybody tell me what are the things to consider....
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Old 14th December 2008, 05:04 AM   #2
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Are you buying the amplifier solely on specifications?
Good spec. on paper does not guarantee 'good' sounds.. good sounds here with reference to your ears..
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Old 14th December 2008, 05:21 AM   #3
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yeah I know about that... but if you see the reviews on their website then its pretty obvious to go with the modules...
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Old 14th December 2008, 05:44 AM   #4
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Quote:
Aussie amplifiers spec seems better than Bryston
so what. Beyond a certain point of almost assured inaudibility spec hunting just doesn't make sense - then price and reliability are mor interesting parameters.
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Old 14th December 2008, 06:19 AM   #5
MOER is offline MOER  United States
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Default Aussie vs Bryston

These amplifiers from Australia look like the typical kit amps with absolute stupid specifications.

Some examples.

220w at 8 ohm and 550w watts at 2 ohms with 2+2 Toshiba TO3P devices. Simply do a SOA table and you will find that these power figures are silly.

The 2SC5200/2SA1943 in terms of SOA are pretty much the same as all TO3-P Toshibas and ON-Semi parts. To obtain 220w into 8 ohms requires 42v across the speaker terminals. Taking output stage losses into account and assume perfect power supply regulation you need a +/-62 v rail.

Now these Auusie guys claim continuous sine wave power. OK. From the Toshiba SOA curve and temp derating the devices for 70 deg C operation you need 1.2 devices for 8 ohm (1.2up and 1.2 down), 2.3 devices for 4 ohm and 4.6 devices for 2 ohm.

Now lets us be practical, with a 1Kw power transformer you will have to run a +/-75v rail to achieve 220w at 8 ohm.

At this rail we need 1.5 devices for 8 ohm, 3 devices for 4 ohm and 6.1 devices for 2 ohm.

mmm well 2+2 does not seem to be that great. Let's all remember the original Crown DC300 from 1967. It ran on +/-60v rails, used a huge 1Kw transformer and ran 2+2 of 2N3773 TO3 devices. Kaboom this amplifier had totally insufficient silicon for the power and this amp was only rated at 150w/ch at 8 ohm.

That is why Crown changed to the DC300A with 4+4 2N3773 devices and their SOA problems were solved.

A Toshiba/On Semi device in TO3-P can pull less than 2A with 60Vceo, a 2N3773 can pull 2.5A. The SOA of this old device is better than the TO3Ps. yes the TO3Ps are better sounding devices, better gain etc. BUT NOT SOA.

So first strike against the Aussies. They are telling tall and I neab tall stories about the capability of their amplifiers. Their 500w is no different with 4+4 devices. To obtain this power you need a +/-100v rail. I doubt that 4+4 Toshibas can do this.

As to their spec of 120dB S/N ratio, I doubt this. What they are saying is that they measure 42uV across the speaker terminal.

Damping factor, well think about this. DF is defined as spk Z divided by the output Z of the amplifier. Now the speaker's DC R is in series with the output Z of the amplifier, so the effective damping factor is 8 divided by 6 = 1.33.

The DC R swamps the output Z by many times so do not include it in the equation. The 5 ohms is the approximate DCR of an 8 ohm speaker.

To measure a DF of 700 with an 8 ohm load means that the output Z of their module is 0.0114 ohms. Not that easy to measure!

As to the question of adding massive supply capacitance. Adding these some many cm away from the actual output device, serves no purpose as the regulation of the power supply comes from the transformer NOT the supply capacitance.

The best way is to have one capacitor right next to each output device.

Further more they are using 6.35mm quick disconnects and these are horrible at high frequencies.

Stephen Mantz
Zed Audio Corporation
Los Angeles
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Old 14th December 2008, 06:58 AM   #6
AKSA is offline AKSA  Australia
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Steve,

You should NOT comment on other manufacturers, particularly if your own corporation can be legitimately criticised.

You may not be aware, but serious allegations have been made against you in a consumer advocacy report, a very easy access through Google.

Better to keep silent, and let others ply their business, without taking the moral high road. Stick your head up, cop a custard pie....

Cheers,

Hugh
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Old 14th December 2008, 07:32 AM   #7
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I agree with Hugh,

Aussie amps has been around a long time and he has remained in business for a reason.

You have used this post as an opportunity to take a pot shot and taken particular statements out of context without giving Aussie amp the opportunity to consider your rebuff and reply.

The competitor who publicly shoots at and his own or another competitors in the same industry is a competitor never to be trusted...ever.

If you have legitimate concern write to the owner and get your facts straight before you mouth off like a fart going out of fashion

And get yourself a good lawyer.
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Old 14th December 2008, 09:42 AM   #8
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what about these..

http://www.aussieamplifiers.com/testimonial.htm
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Old 14th December 2008, 12:58 PM   #9
rabbitz is offline rabbitz  Australia
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I've built 2 amps from Aussie Amplifiers and I can't comment on the specifications... aka power output, distortion % etc but I can comment on Anthony Holton and his products from experience.

Anthony would be one of the most honest amp kit sellers out there and a gentleman to boot. Buying any kit amplifier is based on faith and on both occasions I was very comfortable with the purchase. Quality of product, reliability, suitability and sonics for intended use were more important than the numbers. On each occasion I ran through my intended use and expectations with Anthony prior to purchase.

Both amplifiers performed admirably and as claimed, easy to build and had no startup issues. I still have a NXV200 in my collection of DIY amps and is one of three that have remained for my personal use. This is a sign that I'm satisfied with the sonics for it's intended purpose and that I'm confident in it's reliability for long term use with the loads that will be used. I've built scores of DIY amps and the only ones that have remained are from (in alphabetical order) Peter Daniel, Hugh Dean and Anthony Holton as I have faith in them and their designs. I normally do not do testimonials of audio products but I thought Anthony's deserved comments that may be useful to other potential purchasers and are shown on his website.

I've always thought that when you buy from guys like these, that you get more than an amplifier. You get support, advice and plenty of information.

I'm not affiliated with Aussie Amplifiers.... just a customer.

I don't know what provoked post #5 but I hope it ends there as mud can stick even though one didn't roll in it.
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Old 14th December 2008, 01:34 PM   #10
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The amplifiers on aussieamplifiers are the best so far thanks to Mr. Holton
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