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#391241 - 03/20/13 01:46 AM Powering LFR's
brwsaw Offline
connoisseur

Registered: 10/12/12
Posts: 1019
Can LFR's be powered by a 2 channel ADA1500 and 2 of 4 channels on a ADA1000 without SQ issues at typical party levels?
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#391242 - 03/20/13 02:26 AM Re: Powering LFR's [Re: brwsaw]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10383
Certainly; they'd be more than sufficient.
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#391247 - 03/20/13 08:33 AM Re: Powering LFR's [Re: brwsaw]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8283
Loc: Tacoma
Make sure the gain is the same. I.e. i hink you need 4 identical channels of amplification for the stereo pair. I'd check with Axiom.
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#391248 - 03/20/13 08:34 AM Re: Powering LFR's [Re: brwsaw]
Ken.C Online   content
shareholder in the making

Registered: 05/03/03
Posts: 17768
Loc: NoVA
I'd check with Axiom before taking advice from anyone on these forums regarding this.
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#391271 - 03/20/13 09:45 PM Re: Powering LFR's [Re: brwsaw]
dakkon Offline
connoisseur

Registered: 02/08/04
Posts: 1846
I am going to guess that Andrew used the same % gain across all of the new amp series. You "could" use amps of different gains.. The problem with that is that the different speakers would bet getting power increases at differing rates.


I am using 2 different amps, that have different power ratings, but the same gain.

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#391273 - 03/20/13 10:17 PM Re: Powering LFR's [Re: dakkon]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10383
Alex, no need to guess; the Axiom amplifiers all have a 29dB gain spec(i.e., the incoming voltage is increased about 28 times). Although if different amplifiers are being used it would be desirable to have them be of the same gain so as to keep the front/back balance of the LFR1100s at the intended level, it would be possible to still achieve that balance with amplifiers of different gains if at least one of them had an independent level control which could be adjusted so as maintain the balance despite the different gains(this is adding a complication, of course).

As to whether the amplifiers have to be of identical maximum power output, the answer is no, as Andrew pointed out here about a year ago.
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#391276 - 03/20/13 11:52 PM Re: Powering LFR's [Re: brwsaw]
brwsaw Offline
connoisseur

Registered: 10/12/12
Posts: 1019
Thanks for the link.
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#391296 - 03/21/13 07:53 PM Re: Powering LFR's [Re: brwsaw]
cohesion Offline
local

Registered: 03/27/12
Posts: 211
Loc: Maple, Ontario, Canada
FWIW I am using a 4 channel ADA 1500 with my LFR's and this works very well indeed. I do think this is overkill for the rear channels but on the other hand only 2 channels in an ADA 1500 is overkill in a different way. I once tried to spark some interest in a hybrid solution with mixed channels of 1500 and 1250 but got no interest.

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#391300 - 03/21/13 10:24 PM Re: Powering LFR's [Re: cohesion]
brwsaw Offline
connoisseur

Registered: 10/12/12
Posts: 1019
Anyone ever meet the 400 watt limit and measure the db at any given distance?
I don't know that I'll need the extra power in my next room.


Edited by brwsaw (03/21/13 10:27 PM)
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#391304 - 03/22/13 07:47 AM Re: Powering LFR's [Re: brwsaw]
cohesion Offline
local

Registered: 03/27/12
Posts: 211
Loc: Maple, Ontario, Canada
You mean the recommended max power for the LFR's? That is only a guideline rather than a hard limit. I wouldn't worry!

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