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Junior Varsity
Do you take your crossover for granted? [Powered Speakers]
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<blockquote data-quote="drew gandy" data-source="post: 122681" data-attributes="member: 880"><p>Re: Do you take your crossover for granted? [Powered Speakers]</p><p></p><p>Hi Scott, <span style="color: #000000"><span style="font-family: 'Arial'"><span style="color: #222222"><span style="font-family: 'Verdana'">I agree that this seems like it would be a bad idea but I would argue that until you measure it, you don't know for sure. Keep in mind that the acoustic output of the speaker is a combination of the raw response of the speaker combined with the electronic filters in the box. So, my guess is that the 24 db/oct 120hz filter that Yamaha says on the spec sheet are the specs for the electronic filter that they let you switch in and out (and we don't know what type of characteristics that filter has besides the cutoff frequency and the slope). Once you combine the electronic filter with the raw response of the speaker (and the other filtering they don't let you change), what do you get? We don't really know. Based on my experience with crossovers, sometimes you can arrive at a particular frequency on your filter not because it's the frequency you thought you needed but because that's where you get the phase to line-up in the right places. </span></span><span style="color: #222222"><span style="font-family: 'Verdana'">Another thing to think about is that notches in response might go by unnoticed, at least until you compare it to another system where the notch does not exist.</span></span><span style="font-family: 'Verdana'"><span style="color: #222222"> Add in a live band on stage making their own noise and it get’s really hard to hear notches...</span></span></span></span></p><p></p><p><span style="color: #333333"><span style="font-family: 'Arial'"><span style="font-family: 'Verdana'">I'm not surprised to hear it sounds good. Both of those boxes get good reviews around here and might be considered best in their categories and price classes. </span></span></span><span style="color: #333333"><span style="font-family: 'Arial'"><span style="font-family: 'Verdana'">It looks like the crossover in the JBL sub is 48 db/oct. That's quite steep which means you have a very narrow band of overlap where things can go wrong. It also means there is a lot of phase shift putting the sub further behind in time vs the top (the sonic effect of this might be up for debate). Have you experimented with the polarity switch on the JBL? If it's really 48 db on both the high and low passes I suspect the polarity switch doesn't make much difference on the end result.</span></span></span></p></blockquote><p></p>
[QUOTE="drew gandy, post: 122681, member: 880"] Re: Do you take your crossover for granted? [Powered Speakers] Hi Scott, [COLOR=#000000][FONT=Arial][COLOR=#222222][FONT=Verdana][/FONT][/COLOR][/FONT][/COLOR][COLOR=#000000][FONT=Arial][COLOR=#222222][FONT=Verdana]I agree that this seems like it would be a bad idea but I would argue that until you measure it, you don't know for sure. Keep in mind that the acoustic output of the speaker is a combination of the raw response of the speaker combined with the electronic filters in the box. So, my guess is that the 24 db/oct 120hz filter that Yamaha says on the spec sheet are the specs for the electronic filter that they let you switch in and out (and we don't know what type of characteristics that filter has besides the cutoff frequency and the slope). Once you combine the electronic filter with the raw response of the speaker (and the other filtering they don't let you change), what do you get? We don't really know. Based on my experience with crossovers, sometimes you can arrive at a particular frequency on your filter not because it's the frequency you thought you needed but because that's where you get the phase to line-up in the right places. [/FONT][/COLOR][COLOR=#222222][FONT=Verdana]Another thing to think about is that notches in response might go by unnoticed, at least until you compare it to another system where the notch does not exist.[/FONT][/COLOR][FONT=Verdana][COLOR=#222222] Add in a live band on stage making their own noise and it get’s really hard to hear notches...[/COLOR][/FONT][/FONT][/COLOR] [COLOR=#333333][FONT=Arial][FONT=Verdana]I'm not surprised to hear it sounds good. Both of those boxes get good reviews around here and might be considered best in their categories and price classes. [/FONT][/FONT][/COLOR][COLOR=#333333][FONT=Arial][FONT=Verdana]It looks like the crossover in the JBL sub is 48 db/oct. That's quite steep which means you have a very narrow band of overlap where things can go wrong. It also means there is a lot of phase shift putting the sub further behind in time vs the top (the sonic effect of this might be up for debate). Have you experimented with the polarity switch on the JBL? If it's really 48 db on both the high and low passes I suspect the polarity switch doesn't make much difference on the end result.[/FONT][/FONT][/COLOR] [/QUOTE]
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