Setting Crossover Frequncy in AVR

[katyayan]

Hi i bought JBL Cinesystem recently. (AVR : JBL AVR101 & SPeakers : JBL Cinema 510)

Frequency Response according to Spec Sheet:

Frequency Response of Satellites : 150Hz 20kHz (6dB)
Frequency Response of Subwoofer : 46Hz - 250Hz (6dB)

What is the significance of -6dB?

Please help me in setting correct crossover frequencies in AVR.
Default was 100Hz for all the speakers and sub. But i changed it to 200Hz(which is maximum) after reading some stuff online and according to my understanding.

Thanks in advance

 

[MaSh]

For this frequency range, I would suggest you set the satellites to 100-120hz and sub to 80-90hz.

The - 6db reasoning is quite theoretical and I would let another fm explain or you could look up online for better understanding.

MaSh

Sent from my Redmi Note 3

 

[katyayan]

Whether my satellites will be able to produce frequency below 150Hz if i set it to 100Hz. Since frequency response starts from 150Hz.

Sorry but i am not able to understand it fully.

Suppose i set crossover to 100Hz does it mean that sub will produce frequencies less than 100Hz and satellites will produce more than 100Hz. (This is what i understood by reading online about crossover)
If it does mean that, than how my satellites will produce 100-150Hz. If i am interpreting it wrong please explain the crossover.

Thanks in advance

 

[MaSh]

Whether my satellites will be able to produce frequency below 150Hz if i set it to 100Hz. Since frequency response starts from 150Hz.

Sorry but i am not able to understand it fully.

Suppose i set crossover to 100Hz does it mean that sub will produce frequencies less than 100Hz and satellites will produce more than 100Hz. (This is what i understood by reading online about crossover)
If it does mean that, than how my satellites will produce 100-150Hz. If i am interpreting it wrong please explain the crossover.

Thanks in advance

If you set the crossover of your satellites to say 120, then speakers will play above the 120hz freq only. Now assuming that the frequency fall off is gradual, it should be a good starting point. As for the sub, the closer to set to the speaker cross over point, the better. You dont want to set it too high, for it to be boomy due to the mid bass frequencies. So start with 90-100 and gradually come up to speaker cross over point.

These are just the starting points which you need to set and then play around for it to sound best in your room, which will also have its own role to play.

MaSh

 

[katyayan]

Thanks again.

But what about the frequencies from 120 to 150hz. My doubt is whether my satellites will be able to produce frequencies below 150Hz. Since frequency response starts from 150Hz.

Sorry a newbie here .

 

[MaSh]

Thanks again.

But what about the frequencies from 120 to 150hz. My doubt is whether my satellites will be able to produce frequencies below 150Hz. Since frequency response starts from 150Hz.

Sorry a newbie here .

That's Ok. Let the speakers decide that. Room plays an important role too. For an example, I had yamaha's satellites for about 2 weeks. They were also rated similar to yours. However, when I ran the Audyssey auto setup on my Marantz, it would set the cross over at 100Hz, a good 30-40Hz below the rated frequency. With Satellites you would in any case lose out on a lot of frequencies.

MaSh

 

[efernand1]

Hi

Satellite speakers being either 2 inch or 3 inch drivers are capable of outputting frequencies between 150hz - 20khz.....you can always experiment keeping it at 120hz and keeping the sub frequency at 150hz...which will ensure that there is no gap in outputted frequencies and there is a blend (handshake merge) between the sub and satellites...

I did try this with my old JBL SCS 140 speakers around 4 years back and it did work like a charm.....try all kinds of music / movies then you will know if the speakers sound muddy o r jarring....accordingly adjust frequencies...

 

[rpmahale]

I have JBL SCS 200.5 surround sound system with Denon AVR 2113. I have set all speakers small at crossover set to 120 Hz for Satellite speakers and Subwoofer have frequency response from 35Hz to 200 Hz. AVR setting LFE+Mains. This setting work best in my room.

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[MaSh]

I have JBL SCS 200.5 surround sound system with Denon AVR 2113. I have set all speakers small at crossover set to 120 Hz for Satellite speakers and Subwoofer have frequency response from 35Hz to 200 Hz. AVR setting LFE+Mains. This setting work best in my room.

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What difference do you see between LFE+Mains and just LFE?

MaSh

 

[katyayan]

Thanks every one.

 

[rpmahale]

Lag


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[rpmahale]

LFE means only .1 information and LFE+main means .1 plus anything below crossover frequency of main speakers.

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[Kannan]

Hi i bought JBL Cinesystem recently. (AVR : JBL AVR101 & SPeakers : JBL Cinema 510)

Frequency Response according to Spec Sheet:

Frequency Response of Satellites : 150Hz 20kHz (6dB)
Frequency Response of Subwoofer : 46Hz - 250Hz (6dB)

What is the significance of -6dB?

It is not clear if the 150hz is the f/s of the satellites or the recommended HPF setting. Also I have to presume that a 24db slope has been employed where the AVR splits the sub frequency.
I would recommend to start at 250hz and slowly drop down till 150 and see where the blending is best between the satellites and sub.
Do not go under 150...to be safe be at around 170-200

 

[katyayan]

What will happen if i go below 150Hz. And what is the significance of -6dB. What is the meaning of f/s in your answer. And JBL didnt provide a plot of frequency response. They just gave the numbers in spec sheet.

Thanks

 

[ssf]

LFE means only .1 information and LFE+main means .1 plus anything below crossover frequency of main speakers.

Sent from my Le X507 using Tapatalk

Am not convinced.

If that was the case, my sub would be silent in stereo mode as stereo does not have point one.

Now what I think happens with lfe +mains is that full frequency is sent to mains and anything below the crossover is sent to the sub. This means that if one has a bookshelf or a satellite, they will be trying very hard to produce the full frequency which obviously will be beyond their capabilities and this will end up ending up taxing both the bookshelf's and the amp.

However, trust your ears and your liking and set the um settings accordingly.

 

[Kannan]

What will happen if i go below 150Hz. And what is the significance of -6dB. What is the meaning of f/s in your answer. And JBL didnt provide a plot of frequency response. They just gave the numbers in spec sheet.

Thanks

I looked up the manual but could not see where the -6db is mentioned.
I presume it is the attenuation, the extent to which you can drop the decibel level on each speaker including the subwoofer.

f/s means free air resonance frequency (simply said, you should not feed any frequency to a speaker below its f/s, infact stay an octave above the f/s)

 

[katyayan]

http://in.jbl.com/tl_files/catalog/.../Specification Sheet Cinema 510 (English).pdf you can find -6dB mentioned in this spec sheet. It is available on JBL india's website.

Thanks

 

[Decadent_Spectre]

If the specs are correct (and I highly doubt they are) then you might try a 150Hz XO, assuming the AVR has a 24db LR slope as its LPF.

3" drivers are not ideal for covering the range down to 150Hz, not only will they lack output but excursion will be a problem as you push higher in SPL, one may assume JBL has implemented some processing to prevent over excursion. Still using them too low may result in mechanical damage at a high enough SPL level.

The -6db point (if correct) would indicate the point at which the level of the frequency response (not maximum output) is down 6db from the base.

All that said, just go by what sounds good you, if you are seeking to do it "correctly" then you must purchase a mic and measure the system, you may use REW or something similar. If you do not desire to go down the rabbit hole, hit play, adjust till good, and let it be. You are using the system in a room, the simple specs provided are not enough. The room and positioning will determine the final frequency and phase response at the MLP.

 

[Chetu2109]

Just going by the ear is the best way if room auto correct doesn't work for you. Play a favourite movie or song of yours, listen pause correct and repeat. At least that's how I could get the best out of my speakers.

 

[katyayan]

So basically it all comes down to how good my ears are . Anyways thanks guys i will play, listen and adjust.