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AMPS FOR 1100 ACTIVE
#435937 03/09/20 06:08 PM
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LOOKING AT A 1100 ACTIVE 5.4 SYSTEM.
WHAT AMPS ARE OWNERS USING WITH THESE SPEAKERS?
WOULD CLASS A MAKE A DIFFERENCE WITH THEM?
ANY RECOMMENDATIONS APPRECIATED!
REGARDS
TOM

Re: AMPS FOR 1100 ACTIVE
NuTreez #435938 03/09/20 06:13 PM
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Tom, the major differences between the Axiom Class D amps and Class A amps would be cost, power consumption (efficiency), THD+N and S/N (signal to noise ratio). Compare those and you may also want to talk with Axiom about this for their opinion.


A-LFR/1000-8 & 2/500v4x2
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100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
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Re: AMPS FOR 1100 ACTIVE
NuTreez #435939 03/09/20 06:22 PM
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Generally speaking Class A design is the least efficient but has the highest sound fidelity. Class D has the highest efficiency but isn't quite as high-fidelity. Again, generally speaking.


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Re: AMPS FOR 1100 ACTIVE
SirQuack #435940 03/10/20 02:49 AM
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Tom - most are using Axiom's own amps, which work very well. I have 10 channels of ADA-1500's ... others have ADA-1000's (which I tested, and they were excellent) and ADA-1250's.

The options are almost endless within Axiom's own amps, including a monobloc version of the ADA-1500.

For value, Axiom also does special deals when combining their amps with the Active LFR-1100's.

Other options outside Axiom can also work great - the speakers are pretty efficient.

Do you have a budget in mind? What is your room size?

Re: AMPS FOR 1100 ACTIVE
NuTreez #435991 03/14/20 11:17 PM
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Thank you ALL! & sorry for slow response. I am building a new house with a 10,000 FT3 octogonal common room. Speakers can be up to 18 ft apart. F/R width and 20ftF/R Length if that makes sense.
System will be 4 lfr11A's and four ep800 subs & a 180 (or 1100 Center)
Looking at the 1100A impedance graph they dip to 3.2 ohms.
Looking at good used 5ch amps...names like Krell, Plinius, and a few others ---all class A and double to at least 2 ohms -with extra large torroid's and microfarad storage
Amps can be directly below speakers - basement -in a low volume LVAC system for in-house heat utilization and within 3 ft of speakers.
Just not sure if Class A matters that much with the Active 5- DSP Axiom has with the speaker system.
System will be controlled by either: Casablanca 4a or Trinnov 16and Dirac.
Isotec 150A wall unit for power - 220V
Thanks again for any responses.
Regards
T

Re: AMPS FOR 1100 ACTIVE
NuTreez #435992 03/15/20 12:25 AM
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18' between front speakers is an awful long way. Is your listening spot 18" from each speaker?

If you want used amps, you may want to consider the mighty Yamaha M-80 or M-85 amps. Continuous Power Per channel both channels driven is 250 W into 8 ohms - (0.003% THD), 290 W into 6 ohms - (0.007% THD), 330W into 4 ohms - (0.02% THD) dynamic into power 8 ohms - 380W, into 4 ohms - 650W, stable to 2 ohms. If you want, you can get 30W per channel in pure class A. The monster Yamaha is a very nice sounding solid state amplifier. I had 2 of mine recapped with 105C 5% caps and they sound great. The M-80 is not bridgeable.

Of course, if you're thinking of LFR1100 Actives, you will need 5 channels of amplification per speaker.

Last edited by 2x6spds; 03/15/20 12:30 AM.

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.
Re: AMPS FOR 1100 ACTIVE
NuTreez #435993 03/15/20 12:44 AM
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Tom, 18 feet is a width I've never tried. I've gone 13 feet with all the Axioms you see in my signature (except on-walls), with great results. The LFR1100A manual suggests 6 to 12 feet. Talk with Axiom about that.

As for amps, you may also want to look at Bryston. You'll need ten 28B cubed per LFR1100A.

https://bryston.com/amplifiers/28b3/


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: AMPS FOR 1100 ACTIVE
NuTreez #436001 03/15/20 03:30 PM
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GOOD DAY! AND THANKS AGAIN. 18 FT IS THE MAX DISTANCE AVAILABLE THAT PUT THE LISTENER AT 9 FT-MIDDLE. CAN BE NO LESS THAN 10FT
THANKS FOR YAM AND BRYSTON SUGGESTIONS ALSO. BRYSTON NOT CLASS A AS PER MY THINKING BUT HAVEN'T HEARD FROM ANYONE THAT HAS/IS TRYING DIFFERENT AMPS W/ THE 1100A'S.

Re: AMPS FOR 1100 ACTIVE
NuTreez #436002 03/15/20 03:46 PM
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I have a Pioneer A9 stereo receiver. There have been a few different versions of it. I have the dual mono, with dual toroids and 10,000uF per side. The rating is 70W/channel average into 4 Ohms. It is class AB. I use this to power the M2OW which I can listen to for hours with their broad, deep soundstage, excellent imaging and vanishingly low distortion.

Anyway, I used this receiver to power the active 1100 woofers. The ADA-1000-8 was powering the remaining 8 channels. I had to adjust the volume of the Pioneer to match the ADA because the gain structures are different. I was sitting 10 feet away and could bring the actives to head-splitting levels without the Pioneer giving out. I was not using a sub.

You won't need high average power for the actives particularly since you'll be using subs. You need peak (dynamic) power, low noise and low distortion. The low distortion is the easy part.

Last edited by Mojo; 03/15/20 04:09 PM.

A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: AMPS FOR 1100 ACTIVE
NuTreez #436003 03/15/20 05:50 PM
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Yamaha M80 can be set for pure class A 30W per channel.


Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.
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