Spkrdctr Posted October 20, 2005 Share Posted October 20, 2005 Geez! You guys are ALL WRONG!!!! Everyone who has seen a ship in a bottle, knows that those ports are so the Klipsch people can get them there drivers into that cabinet. I can't believe you guys don't know the simplest stuff. All brains and no common sense![] Quote Link to comment Share on other sites More sharing options...
dragonfyr Posted October 20, 2005 Share Posted October 20, 2005 [] You, of all people, should know that "common" sense is anything but on this site![] Quote Link to comment Share on other sites More sharing options...
rockbobmel Posted October 20, 2005 Share Posted October 20, 2005 I thought of that. The holes in the back are about 8 x 8" and are about 3" from the rear of the box and lined up (somewhat). There is about 2" side clearance and 1" top. So the rear firing sound is almost all going out the back - somewhat unrestricted. I was really surprised that it made no noticeable difference in LF. BTW the speakers have a very high LF response. When I do a Pink noise balance test. The pitch (timbre) seems lower than my mains, RF-7s. Quote Link to comment Share on other sites More sharing options...
DrWho Posted October 20, 2005 Share Posted October 20, 2005 I thought of that. The holes in the back are about 8 x 8" and are about 3" from the rear of the box and lined up (somewhat). There is about 2" side clearance and 1" top. So the rear firing sound is almost all going out the back - somewhat unrestricted. I was really surprised that it made no noticeable difference in LF. BTW the speakers have a very high LF response. When I do a Pink noise balance test. The pitch (timbre) seems lower than my mains, RF-7s. You won't percieve any increased LF response with pink-noise unless you have it really loud... The lower timbre you hear is most likely due to the tapered array crossover which requires some attenuation of the tweeter to match up with the woofers. The RC-7 is also using the K-67-KV driver versus the K-67-DV on the RF-7. I wonder if they didn't achieve the attenuation by slightly modifying the driver, which will of course slightly change the sound too. And then don't forget that your center channel is in a different position in the room which will definetly change its sonic properties...the fact that you have it in a cabinet and are noticing more low-end indicates that you have speaker-cabinet resonations being amplified by your cabinet. Also, after the sound goes out of the hole how far does it have to travel to get around the cabinet and out towards the listening position? If it takes more than a quarter-wavelength for the sound to get around, then your ports are doing nothing for the sound (in fact, if anything they are hurting the sound). Quote Link to comment Share on other sites More sharing options...
dragonfyr Posted October 20, 2005 Share Posted October 20, 2005 If it takes more than a quarter-wavelength for the sound to get around, then your ports are doing nothing for the sound (in fact, if anything they are hurting the sound). Greater then 1/4 wavelength and you will experience comb filtering as the 2 signals will sum out of phase. But if we are talking about 50Hz, that is a difference of ~5 feet relative to the listener's position. And for the benefit of the few of you out there who have admitted being prone to confusion, yes...I literally mean "comb" filtering. That is because it is vitally important to place a comb (preferably the small black plastic type one carries in their back pocket) directly into the port. This insures that the various frequencies stay nice and orderly and that they do not become too tangled and confused which may too often subsequently result in fights. After all, sound waves do have a bit of a temper compounded by a slight anger management problem. And, contrary to what some may think, sound waves are not quite as smart as the electrons for which Doc is going to publish the maps... So it is always nice when someone takes the time to care a bit about the welfare of the too often overlooked sound waves... It seems that they are invisible to many in modern society! A sad statement of the uncaring nature of our culture! Quote Link to comment Share on other sites More sharing options...
hwatkins Posted October 23, 2005 Share Posted October 23, 2005 Now this was fun to read - although I still think my answer on page one was more germaine and precise to the original question. However - entertainment value has been high... Quote Link to comment Share on other sites More sharing options...
michael hurd Posted October 26, 2005 Share Posted October 26, 2005 What was not mentioned is the reduction in distortion resulting from less cone movement in a vented system at F3. ( reduction from inductance variation and BL fluctuations, as well as a reduction in frequency modulation distortion ) Quote Link to comment Share on other sites More sharing options...
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