Home |
Search |
Today's Posts |
#1
|
|||
|
|||
why would genelecs have a 500hz bump?
i remember Mr. Dorsey saying genelecs typically have a frequency rise
at 500hz, likely due to porting issues. and then other people agreed as if it is a known, matter-of-fact issue. i'm "baffled" why such a highly-regarded company would let this kind of design anomaly exist in their product line. any ideas? and as a side note, what is an "infinite baffle"? |
#2
|
|||
|
|||
why would genelecs have a 500hz bump?
xy wrote:
i remember Mr. Dorsey saying genelecs typically have a frequency rise at 500hz, likely due to porting issues. That's a really narrow Q thing, and not all of the Genelecs do it. and then other people agreed as if it is a known, matter-of-fact issue. i'm "baffled" why such a highly-regarded company would let this kind of design anomaly exist in their product line. any ideas? Because it's not really a problem. It's an organ-pipe resonance, and if you know it's there, you can listen around it. I wouldn't consider that acceptable for mastering work, but it's typical of studio speakers. and as a side note, what is an "infinite baffle"? Imagine a speaker with a baffle and an open back. The lowest usable frequency is directly related to the size of the baffle. Now, make the baffle bigger and bigger.... and at some point you're dealing with a speaker that is enormous but has good low end. Very popular in the days before the Theile-Small work made it possible to design good boxes. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#3
|
|||
|
|||
why would genelecs have a 500hz bump?
so a speaker that is soffit-mounted perfectly to a giant hard wall is
something like an infinite baffle? "organ pipe resonance". i can't even stand the thought of it! an expensive speaker should not require a work-around like that, imho. that's what cheap speakers force us to do! |
#4
|
|||
|
|||
why would genelecs have a 500hz bump?
xy wrote:
so a speaker that is soffit-mounted perfectly to a giant hard wall is something like an infinite baffle? Yes. And for this reason it requires a cross-over that is different from the one used with a free standing loudspeaker or at the very least a different equalizer setting. If you design for free standing then the cabinet width becomes a factor in how you choose x-over because you want to make it easy for yourself to equalize the baffle diffraction step, some 4 to 6 dB shelving acoustic high end Eq that must be counteracted in the x-over. You can omit those concerns if you design for wall integration, in which case frequency selection is only about loudspeaker unit diameter and Fs. Those that make very narrow loudspeaker fronts do not necessarily make it easier for themselves because they move the correction issue up in a frequency range where it is much more audible in case the correction is not correct, just my opinion. Kind regards Peter Larsen -- ************************************************** *********** * \\\\\\\ Quality Ascii handcrafted by Peter Larsen /////// * * \\\\\\\ My site is at: http://www.muyiovatki.dk /////// * ************************************************** *********** |
#5
|
|||
|
|||
why would genelecs have a 500hz bump?
tusen takk, Peter.
so if you soffit-mount a big mains system into a large wall, you need to adjust the crossover. or if the wall is big or small it's mounted in, that could affect the crossover. never knew that. i only knew about the bass-boost effect. i learn something new here everyday. |
#6
|
|||
|
|||
why would genelecs have a 500hz bump?
xy wrote:
tusen takk, Peter. so if you soffit-mount a big mains system into a large wall, you need to adjust the crossover. or if the wall is big or small it's mounted in, that could affect the crossover. Nah ... not really, you have to see this in the context of half a wavelength, if the cabinet front is wider than about 1 meter, then other effects start to matter more. never knew that. i only knew about the bass-boost effect. i learn something new here everyday. Already the bass boost will cause unlinearity, because it tends to shelve below 150 Hz. One is imo best off maximizing it, i.e. going close to the corners of the room with the bass unit/cabinet so as to at least get it as uniform as possible. This too can rapidly become "of interest" when selecting where the lowest cross-over frequency should be located. But please do understand that cross-over math has to consider all units, one can not always move single cross-over frequencies in a multiway system freely because they also influence summing at the next cross-over frequency. Kind regards Peter Larsen -- ************************************************** *********** * \\\\\\\ Quality Ascii handcrafted by Peter Larsen /////// * * \\\\\\\ My site is at: http://www.muyiovatki.dk /////// * ************************************************** *********** |
Reply |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
$3500 genelecs for mastering | Pro Audio | |||
HELP! Need a pair of Genelecs in New England! | Pro Audio |