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Crossover Help
#431908 04/23/19 05:01 PM
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Hello Everyone,

New Axiom customer. Hopefully my speakers should be delivered within the next two weeks. I have ordered 9 speakers for my first "real" home theatre. They are as follows...

LCR - M5HPv4 In-wall
Rear - M2v4 In-wall
Atmos - M3v4 In-ceiling

I have been reading about speaker setup, specifically the crossover frequency as this is not something I have any knowledge of. Looking at the specs of the three speaker types they obviously have different frequency response capabilities.

What does the group recommend for crossover frequency for the above?

Thank you.


M5HPv4 In-wall LCRs
M2v4 In-Wall Rears
M3v4 In-Ceiling Atmos
Yamaha RX-A3070
Re: Crossover Help
hhiggins #431909 04/23/19 05:10 PM
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The cross-over frequency is not only speaker-dependent, it is also room/location-dependent. Presumably you have a receiver with auto set-up capabilities. The receiver will find the correct cross-over for each speaker. Using that as a baseline, you can then experiment with different settings. If you have a sub, setting the cross-over to a higher frequency will relieve your receiver of having to re-produce the majority of the lows which will give it some more headroom.

The flip-side of that is that the channel bass the recording engineer intended for that channel won't come through the intended speaker which may reduce the A/V experience. Since I got my QS10s for example, my receiver found them at 40Hz and I've left them there. I've been surprised how much bass content comes through and how great it sounds.

Great choice on the speakers BTW!

Re: Crossover Help
hhiggins #431910 04/23/19 05:18 PM
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Thanks Mojo! I have a Yamaha AVR RX-A3070 which uses YPAO. I will use that first and tweak as required as you suggested. I do have an old sub that I just couldn't afford to replace yet. Maybe next year.

I have also read that many of the auto set-up capabilities tend to set the front speakers to "large" and many people change that to "small". Is this something I should also keep an eye on during setup?


M5HPv4 In-wall LCRs
M2v4 In-Wall Rears
M3v4 In-Ceiling Atmos
Yamaha RX-A3070
Re: Crossover Help
hhiggins #431911 04/23/19 05:24 PM
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If you set them to large, the receiver will send the sub-bass to them as well. I don't recommend that with the M5s. As great as the M5s are, if you have your receiver's gain set anywhere near 0, the bass from the M5s will distort during peaks. Even if you had M100s I wouldn't do it because it will tax your Yammie.

So leave them as small. It is going to sound great and you'll be kicking yourself for not doing this earlier!


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: Crossover Help
hhiggins #431912 04/23/19 05:49 PM
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Right on. Thanks for the info. I do have other questions on speaker placement as my room will present challenges. I will post those as a separate thread later.


M5HPv4 In-wall LCRs
M2v4 In-Wall Rears
M3v4 In-Ceiling Atmos
Yamaha RX-A3070
Re: Crossover Help
hhiggins #431913 04/23/19 08:07 PM
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That'll be a nice setup! I thought I had my crossovers figured out until I ran Audyssey and realized that my room had a major impact on frequency response. For example, Axiom specs had me wanting to cross my M5s at 60hz, but my left channel M5 has a major dip in response at 70hz, so 80hz becomes the ideal crossover point.

https://photos.app.goo.gl/rkCY7ehFFaKBQhSy5


Axiom M5HP VP160 M3 ADA1000
Anthem MRX 720
SVS SB-3000 (dual)
Re: Crossover Help
bman84 #432019 04/30/19 02:55 PM
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I'm sorry, but I am not sure how to interpret the graph you supplied. Can you point me to what to look at?


M5HPv4 In-wall LCRs
M2v4 In-Wall Rears
M3v4 In-Ceiling Atmos
Yamaha RX-A3070
Re: Crossover Help
hhiggins #432021 04/30/19 03:59 PM
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Look at the green trace on the left. Find the number 100 at the bottom of the chart. Now look at the large dip that goes down to -15. That's the dip in response bman is talking about. That's not because there's a problem with his M5. It's because he has a jog in his wall at a quarter wavelength of 70Hz away from his M5. It's causing destructive interference as a result, right at 70Hz, causing him to lose 15dB of signal at that frequency. 15dB is 32 times less power than he should have at that frequency.

The red chart on the left shows the correction his software on his Denon made. It's better but still down 9dB or about 16 times less power than he should have at that frequency.

Crossing over at 80Hz, as he said, allows his dual subs to take over which I imagine gets rid of that valley.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: Crossover Help
Mojo #432024 04/30/19 04:20 PM
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Thank you very much! What would be required to make these types of graphs and to take these types of measurements?


M5HPv4 In-wall LCRs
M2v4 In-Wall Rears
M3v4 In-Ceiling Atmos
Yamaha RX-A3070
Re: Crossover Help
hhiggins #432037 04/30/19 09:08 PM
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You need a receiver like the Denon 4500H that bman has along with a $30 Audyssey app from the app store.

There are other ways too but they get more complicated.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
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