Get Free, Friendly, Expert Advice
Call 1-888-352-9466 or email

Designed and Manufactured in Canada Since 1980

Axiom Dolby Atmos 7.2.4 Cinema
Solarrdadd's 7.1 Apartment HT!
AxiomAudio Blog

Insider’s Sneak Peek: AxiomAeris

Axiom’s New Computer Speakers

Blind Listening Tests

Who's Online
0 registered (), 57 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
13,401 Registered Members
11 Forums
23,281 Topics
412,547 Posts

Most users ever online: 378 @ 02/24/13 04:33 PM
Top Posters
Ken.C 17967
pmbuko 16378
SirQuack 13358
CV 11521
MarkSJohnson 11247
Meanwhile On Facebook
Page 22 of 22 < 1 2 20 21 22
Topic Options
Rate This Topic
#400000 - 01/12/14 05:16 PM Re: Axiom Amplifiers: The Next Generation [Re: Socketman]
Mad_Chesser Offline

Registered: 01/11/13
Posts: 195
Loc: B.C., Canada
Hey thanks for the replies Andrew! What you said makes perfect sense.

I'm really excited to own a 3 channel ADA-1500 now even more! As suggested before, I think I'll just run the rears off my sc-61. feels like it's going to be forever by the time I have a complete stereo. lol

I've been building it bit by bit. I still need a subwoofer. Still need a pair of QS8's. Still need a power amp.

I'm getting there though smile

I literally JUST received a vp160...god what a dominant center. I love it. It makes people's jaws drop when they come in my house. lol

2 Axiom M80s v3
1 Axiom VP160 v3
2 Paradigm ADP-150
Pioneer SC-61
Rotel RMB-1095
51" Samsung Plasma

#400007 - 01/12/14 07:50 PM Re: Axiom Amplifiers: The Next Generation [Re: Ian]
tomtuttle Offline

Registered: 06/20/03
Posts: 8438
Loc: Tacoma
Brilliant posts, Andrew. Thank you.
bibere usque ad hilaritatem

#400379 - 01/26/14 06:45 AM Re: Axiom Amplifiers: The Next Generation [Re: Ian]
jmone Offline

Registered: 01/08/06
Posts: 176
Loc: Sydney Australia
I'm still thinking on how to drive all my speakers.... One question on the Axiom Amp is why the toroidal PS over Switch Mode PS?
HT:M80s,VP150,QS8,EP500 Outside:2 Pair M3 1 Pair M22 Office:AudioBytes, Games Room: M60,VP150

#400380 - 01/26/14 10:42 AM Re: Axiom Amplifiers: The Next Generation [Re: Ian]
brwsaw Offline

Registered: 10/12/12
Posts: 1296
Loc: Canada
From Axioms products page;

"By combining a class-D amplifier with a toroidal transformer and a large storage capacitance, you have the muscle you need to deliver power where it's needed, when it's needed."

Edited by brwsaw (01/26/14 10:47 AM)
I wish I could see inside my brain, see if anyones home...

#400659 - 02/05/14 01:26 AM Re: Axiom Amplifiers: The Next Generation [Re: Ian]
rcb Offline

Registered: 08/26/13
Posts: 9
Sorry if this has been said.. it's a long thread!

Those linear power supplies (which prefer to draw their line current in big horrible spikes, and would love a chance to intermodulate your music with rectified line voltage), combined with the inherent nonlinearities in both class AB and D output stages, tend to complicate amplifier design a bit more than Andrew is letting on.

Using huge capacitor banks, minimizing dead time (in class D), raising bias current (in AB), shielding, etc. all reduce the distortion and noise somewhat, but what really makes the difference is the control loop.

What makes the Axiom amps better than the previous generation of class D (and what I'm surprised I haven't heard people talking about) is the way they generate their switching signals; they are essentially self-oscillating delta sigma modulators (similar to a lot of ADCs / DACs). The control loop in this type of amp acts as a low-pass filter for any signal that shows up at the input, but a high-pass filter for the noise that's generated inside the amp. This essentially separates the "good" and "bad" signals into different frequency ranges, with the "bad" being moved up where you can't hear it, and then directed right into the stop-band of the output filter. It also lends itself to tight control with high loop gain over the whole audio spectrum, and allows the control loop to accurately account for the time the output stage spends in between the rails.

I could see it being sensitive to higher frequency EMI though.. hence the linear supply?

#406587 - 08/15/14 12:16 AM Re: Axiom Amplifiers: The Next Generation [Re: jmone]
bridgman Offline

Registered: 08/25/04
Posts: 5581
Loc: Bowmanville, Ontario, Canada
Originally Posted By: jmone
I'm still thinking on how to drive all my speakers.... One question on the Axiom Amp is why the toroidal PS over Switch Mode PS?

This might sound like a trite answer but it's not intended that way... since AFAIK typical power amplifier power supplies are not regulated there's no inefficient linear regulator to replace, so the main application of switch-mode power supplies in power amps would be dynamically adjusting the rail voltage of a linear amplifier to reduce the amount of power being dissipated in the output transistors on average.

Since the Axiom amps are basically "switch-mode amplifiers" they can use a simple (but big-ass) power supply without burning energy up as heat anywhere.

Edited by bridgman (08/15/14 12:16 AM)

Page 22 of 22 < 1 2 20 21 22

Moderator:  alan, Andrew, Brent, Debbie, Ian, Jc 

Home  |  Corporate Info  |  Products  |  Message Board  |  FAQs  |  Warranty  |  Site Map  |  Privacy Statement   |  Contact Us

©2015 Colquhoun Audio Laboratories Limited
All Rights Reserved.