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M-100 replacement cross-overs
#421220 11/27/16 03:10 PM
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Brendan Offline OP
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Good afternoon Debbie,

I am finally getting around to changing out the cross-overs you sent out to me. I never did ask; do you want the old ones back? I will put them aside for now. Let me know. Now that I have them right out, It looks like the steel core plates of the failing coil have physically shifted. Just curious if you guys have ever seen this before. Have a great weekend, and thanks again for your support!

Cheers, Brendan

Re: M-100 replacement cross-overs
Brendan #421224 11/27/16 07:37 PM
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I was wondering when you would blow the shit out of your M100s by driving them with distorted music to ear-deafening levels. Guess what? When you push an awfully large DC component into a speaker, shift happens!


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: M-100 replacement cross-overs
Brendan #421227 11/27/16 08:10 PM
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axiomite
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Probably didn't have his speakers anchored down. Anything over an M80 you need at least two anchors, preferably into bedrock.


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
Re: M-100 replacement cross-overs
Brendan #421229 11/27/16 09:30 PM
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Once you get into the LFR1100 you need a graviton beam to anchor it. Play them too loud and it will adjust the rotational direction of the Earth.


Anthem: AVM60
Axiom: ADA1000, LFR1100, VP180, QS8, EP500, M3, M3comp
AudioSource: Amp One/A
Re: M-100 replacement cross-overs
Brendan #421230 11/27/16 10:21 PM
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Thanks for replying everyone. Just posted this here because my last 2 emails went un-answered. This was meant for the folks at Axiom. So far, they have been quite helpful.

Mojo : Axiom has no issues with what I am driving them with, or how hard at this point. My max measured peak dc (using an oscilloscope) never surpassed 1.188v. Thanks for the snarky response anyway.

Have a great evening.

Re: M-100 replacement cross-overs
Brendan #421233 11/28/16 01:46 AM
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axiomite
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Might be worth a quick phone call to Axiom rather than email, especially now that we all piled on to your thread smile


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
Re: M-100 replacement cross-overs
Brendan #421234 11/28/16 02:24 AM
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If I was Axiom, I wouldn't argue and would give you a new cross-over. I wouldn't want to be known in the industry as having speakers that "blow". It's simply not worth arguing over especially since it is a relatively rare occurrence.

However, from what I read before, you have a need that you feel can only be answered by high sound pressure levels. Your Sherwood amp may not be enough for you and as a result, you are driving it to clipping. The harmonic distortion likely isn't a problem for the M100s but given your high power levels, the subsonic signal that is generated from the clipping may not only damage your cross-over but also the woofers. The suspension may be getting distorted and the alignment of your driver may be affected.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: M-100 replacement cross-overs
Brendan #421244 11/28/16 10:52 PM
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Thanks for all the info / comments everyone.

Mojo: can you shed a bit more light regarding the possible clipping. I don't know how else to measure this other than what I have already done. In regards to the Sherwood amps; I think at this point they are handling what I am asking them to do, but I am aware that I am pushing them near to their design limits. I am currently using 2 amps, one dedicated for the lf portion, and the other for the hf portion and the centre channel. If you can suggest taking measurements with different equipment, I am all ears.

Thanks again everyone for all of your time and support.
Have a great evening.

Re: M-100 replacement cross-overs
Brendan #421251 11/29/16 05:05 AM
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I thought you have one 7-channel Sherwood amp.

It is pointless to attempt to measure distortion or power levels without the proper equipment.

The highs should sound very fatiguing highs when clipping. The mid and woofer drivers may also be moving in a funky, distorted way.

You might want to try measuring the C-weighted SPL, 3 feet away from one of your speakers. If you measure peaks of 115 dB with 2 channels driven from that Sherwood 7-channel amp, it's reached its 220W/channel (2-channels driven) into 4 Ohms limit. If the amp is older or has been stressed, it may not even be able to reach that limit.

The M100s should be good to about 118 dB (in room) according to the sensitivity and power handling specs.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: M-100 replacement cross-overs
Brendan #421264 11/29/16 10:47 PM
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The sound is not fatiguing at all (the axiom gear sounds pretty sweet). Yes, 2 of these amps; just to distribute the speaker load, lessen the strain on the amps. I will purchase an spl meter, any suggestions as to brands? I would very much like to take some readings for everyone. And just so everyone is clear, the cross-overs didn't fail, it was only one component on the LF side of the card (heating issue). Everything else was a.o.k. Left a message for the folks at Axiom today, hope to hear back from them soon!

Have a great night everyone

Last edited by Brendan; 11/29/16 11:10 PM.
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