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Selecting the right amp for the LFR1100
#416217 01/03/16 10:26 PM
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I guess this is as much a question out to Craig who seems to know quite a bit about testing and has listened to the potential of Axiom's LFR1100 v4 speakers.

I will give Deb a call in the week to get a price for the ADA1000 amp, but just going off the list CAD there are quite a few options for the $1500+tax list price of this unit.

I have not tried this amp so I have no real basis to examine how they sound. I have used an Anthem MCA5 and once you get past the ground loop humm the 250w of power does have what it takes to make the LFR's sound good. My lesser Amp/One at estimated 1/2 that power doesn't seem to have the same dynamics.

But I have read on these hallow pages of owners of the LFR's running on Crown XLS amps and did not hear any negative word. From a price perspective two Crown XLS1002 can deliver 350w for around $1000, or even an XLi800 for 300w for $800.

I am gathering that it would make far more sense for me to simply look at two matched stereo amps than try and find a 4 channel option. But even an Emotiva XPA5 can give me the 5x300w at 4ohms for about $1100.

What are others using, and do you feel that you are getting the sound output that you fancy? I have about $1200 to spend hopefully taxes in.. but can scrimp and save a bit more if pushed.


Anthem: AVM60
Axiom: ADA1000, LFR1100, VP180, QS8, EP500, M3, M3comp
AudioSource: Amp One/A
Re: Selecting the right amp for the LFR1100
MatManhasgone #416223 01/04/16 01:38 AM
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Ask Axiom for the frequency and phase response curves of the LFR serial number you purchased for the SPL range you'll be listening to. Then send these to Emotiva and ask them to evaluate if their XPA5 can remain stable across the SPL and frequency ranges.

Or just skip that and buy the ADA from Axiom. I trust Andrew did his homework.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: Selecting the right amp for the LFR1100
MatManhasgone #416226 01/04/16 04:28 AM
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Please excuse my ignorance.. but what does SPL mean?


Anthem: AVM60
Axiom: ADA1000, LFR1100, VP180, QS8, EP500, M3, M3comp
AudioSource: Amp One/A
Re: Selecting the right amp for the LFR1100
MatManhasgone #416228 01/04/16 01:31 PM
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Sound Pressure Level.


::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::
Re: Selecting the right amp for the LFR1100
Mojo #416231 01/04/16 02:30 PM
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Originally Posted By Mojo
Ask Axiom for the frequency and phase response curves of the LFR serial number you purchased for the SPL range you'll be listening to. Then send these to Emotiva and ask them to evaluate if their XPA5 can remain stable across the SPL and frequency ranges.

Or just skip that and buy the ADA from Axiom. I trust Andrew did his homework.


In the above, I should have said impedance response curve instead of frequency response. You want to find out if the XPA5 can remain stable across that impedance response for all sound pressures of interest.

Re: Selecting the right amp for the LFR1100
MatManhasgone #416234 01/04/16 04:09 PM
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I gave a phone call out to Axiom and spoke with Deb.

I inquired about the ADA1000 and her take on it was that driving a pair of the large LFR1100 with that amp was not recommended. Maybe for a small pair of Bookshelf like the M3 or M22, but not for the floor standards.

The amp just wont handle the power pull for the large speakers and I really need to look at the ADA1250 at pretty much double the cost. OUCH!

Well, I left it that we'd see what Ian can do or say about this purchase, but at this point it looks like someone else's amp is going into my home.


Anthem: AVM60
Axiom: ADA1000, LFR1100, VP180, QS8, EP500, M3, M3comp
AudioSource: Amp One/A
Re: Selecting the right amp for the LFR1100
MatManhasgone #416235 01/04/16 04:42 PM
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I am stunned! Is it because the 1100 is highly inductive at low frequencies?

I am double-stunned given the 1100 overview page specifies the ADA-1000 as a good match for the 1100.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: Selecting the right amp for the LFR1100
MarkSJohnson #416274 01/05/16 03:50 AM
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Originally Posted By MarkSJohnson
Sound Pressure Level.

Silly people lurking. C'mon Mark. Quit fooling around.


Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!
Re: Selecting the right amp for the LFR1100
MatManhasgone #416477 01/14/16 11:57 PM
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I got the quote back from Deb and it's basically selling at Factory Outlet prices.

She gave the price for the ADA1250 that is 312w@4ohms;. The ADA1000 is 250w@4ohms;

By comparison, I can buy a Crown XLS1002 and get 350w@4ohms; so i will gather it's about in line with the mid level Axiom amp except it's a switching power supply over the Axiom linear toroidal unit. Now according to the video from Andrew, the linear powersupply allows them to upgrade the unit to as many amp boards with the same power design. The Crown does not do this but really do I care. I just want 4 channels so I'd buy two units and on the shelf they go driving the speakers.

So we are back to the unanswerable question of which of those two amps would sound better? Craig?? and opinion??

Last edited by oakvillematt; 01/14/16 11:58 PM.

Anthem: AVM60
Axiom: ADA1000, LFR1100, VP180, QS8, EP500, M3, M3comp
AudioSource: Amp One/A
Re: Selecting the right amp for the LFR1100
MatManhasgone #416482 01/15/16 12:02 PM
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Matt - I am still officially listed as a dealer for Crown products, and am quite familiar with the XLS line.

I am currently still running the ADA-1000 into the LFR's, even though I added an ADA-1500-4 into the system (planning on using the 1000 for the upstairs theater). The reason I have not swapped the 1500 into the system yet is twofold:

1. It's been a zoo around here with kids home from college, 2016 planning for my financial services company .. etc ...

2. The ADA-1000 is just plain so good I have not been tempted to move it out and the 1500 in.

It's a premium product with a commensurate feel to it, and is hand built. The Crown stuff is basically Behringer quality, made in China gear, and feels like it.

Crown's upper end gear like Macro Tech gets that high end feel, but the lower price stuff doesn't.

The lower price stuff will have fan noise, and is prone to clipping harshly. The ADA-1000 will never make a bad noise, even when pushed.

The ADA-1000 will still be going strong in 10 years. The Crown will likely be your third or 4th amp in ten years.

For overall feel, it is somewhat like purchasing close to Bryston quality for a fraction of the cost.

That was my personal purchase decision - your decision and thoughts may differ from mine.

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