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#1
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
George wrote: Hey guys, a local pawn shop has a pair of JBL E90's for sale, included with them is a pair of E20 bookshelf speakers. The only problem is two of the woofers are dented in, Do you mean the round dust caps are dented on the front of each speaker driver? If only the dust caps are dented in, don't worry about it. They're only dust caps and don't affect the sound. one on the E90 and one on the bookshelf's. I contacted JBL and they said they would ship out two brand new woofers for 80 bucks. Do you think I should buy them anyway and just fix them or let them go. The E90's go for anywhere between 250 and 400 dollars and the smaller ones are 160 a piece, any thoughts? I'm not familiar with these speakers. If you like 'em, buy 'em. Also, I'm crossposting my comments to rec.audio.tech, where you might get some technical advice. Thanks George |
#2
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
it's the round part in the middle of the woofer, the one on the e90 is only
dented a bit but the bookshelf one is crushed completely in, the dust cap I mean, the rest of the woofer is ok. Do you think its still a good deal? I heard the were decent speakers, I'm mad because a week ago they were in perfect condition and should have bought them then but didn't know how good they were, when I found out I went back and the dustcaps were crushed in. Thanks George wrote in message oups.com... George wrote: Hey guys, a local pawn shop has a pair of JBL E90's for sale, included with them is a pair of E20 bookshelf speakers. The only problem is two of the woofers are dented in, Do you mean the round dust caps are dented on the front of each speaker driver? If only the dust caps are dented in, don't worry about it. They're only dust caps and don't affect the sound. one on the E90 and one on the bookshelf's. I contacted JBL and they said they would ship out two brand new woofers for 80 bucks. Do you think I should buy them anyway and just fix them or let them go. The E90's go for anywhere between 250 and 400 dollars and the smaller ones are 160 a piece, any thoughts? I'm not familiar with these speakers. If you like 'em, buy 'em. Also, I'm crossposting my comments to rec.audio.tech, where you might get some technical advice. Thanks George |
#3
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
George wrote:
it's the round part in the middle of the woofer, the one on the e90 is only dented a bit but the bookshelf one is crushed completely in, the dust cap I mean, the rest of the woofer is ok. Do you think its still a good deal? I heard the were decent speakers, I'm mad because a week ago they were in perfect condition and should have bought them then but didn't know how good they were, when I found out I went back and the dustcaps were crushed in. If they work, they work. If the cap is smashed enough to distort the voice coil, you could have an issue; but testing will indicate whether this is so.... jak Thanks George wrote in message oups.com... George wrote: Hey guys, a local pawn shop has a pair of JBL E90's for sale, included with them is a pair of E20 bookshelf speakers. The only problem is two of the woofers are dented in, Do you mean the round dust caps are dented on the front of each speaker driver? If only the dust caps are dented in, don't worry about it. They're only dust caps and don't affect the sound. one on the E90 and one on the bookshelf's. I contacted JBL and they said they would ship out two brand new woofers for 80 bucks. Do you think I should buy them anyway and just fix them or let them go. The E90's go for anywhere between 250 and 400 dollars and the smaller ones are 160 a piece, any thoughts? I'm not familiar with these speakers. If you like 'em, buy 'em. Also, I'm crossposting my comments to rec.audio.tech, where you might get some technical advice. Thanks George |
#4
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
jakdedert wrote: George wrote: it's the round part in the middle of the woofer, the one on the e90 is only dented a bit but the bookshelf one is crushed completely in, the dust cap I mean, the rest of the woofer is ok. Do you think its still a good deal? I heard the were decent speakers, I'm mad because a week ago they were in perfect condition and should have bought them then but didn't know how good they were, when I found out I went back and the dustcaps were crushed in. If they work, they work. If the cap is smashed enough to distort the voice coil, you could have an issue; but testing will indicate whether this is so.... BTW, it's possible to fix pushed-in dust caps. There's a trick involving making a small hole in the dust cap, then pulling the dust cap toward the front of the speaker. I haven't done this. By searching the web and newsgroups, you could probably find instructions for pulling the dust caps outward so that they're not pushed in. Another BTW: The reason dust caps are so easy to push in is that there's a vacuum inside the dust cap. OTOH, this sort of thing like pushed-in dust caps may really bother you. If you buy the speakers with the pushed-in dust caps, will you really be happy? Life's too short to be unhappy and there are about a zillion other speakers you could buy instead. Will repairing the speakers make you happy? And keep in mind that almost anything you can find in pawn shop will probably also be found on eBay. (Actually, a lot of pawn shops sell through eBay.) Anyway, you might want to search eBay now and see if you can get the same speakers there, but w/o the pushed-in dust caps. jak Thanks George wrote in message oups.com... George wrote: Hey guys, a local pawn shop has a pair of JBL E90's for sale, included with them is a pair of E20 bookshelf speakers. The only problem is two of the woofers are dented in, Do you mean the round dust caps are dented on the front of each speaker driver? If only the dust caps are dented in, don't worry about it. They're only dust caps and don't affect the sound. one on the E90 and one on the bookshelf's. I contacted JBL and they said they would ship out two brand new woofers for 80 bucks. Do you think I should buy them anyway and just fix them or let them go. The E90's go for anywhere between 250 and 400 dollars and the smaller ones are 160 a piece, any thoughts? I'm not familiar with these speakers. If you like 'em, buy 'em. Also, I'm crossposting my comments to rec.audio.tech, where you might get some technical advice. Thanks George |
#5
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
wrote in message oups.com... jakdedert wrote: George wrote: it's the round part in the middle of the woofer, the one on the e90 is only dented a bit but the bookshelf one is crushed completely in, the dust cap I mean, the rest of the woofer is ok. Do you think its still a good deal? I heard the were decent speakers, I'm mad because a week ago they were in perfect condition and should have bought them then but didn't know how good they were, when I found out I went back and the dustcaps were crushed in. If they work, they work. If the cap is smashed enough to distort the voice coil, you could have an issue; but testing will indicate whether this is so.... BTW, it's possible to fix pushed-in dust caps. There's a trick involving making a small hole in the dust cap, then pulling the dust cap toward the front of the speaker. I haven't done this. By searching the web and newsgroups, you could probably find instructions for pulling the dust caps outward so that they're not pushed in. Another BTW: The reason dust caps are so easy to push in is that there's a vacuum inside the dust cap. OTOH, this sort of thing like pushed-in dust caps may really bother you. If you buy the speakers with the pushed-in dust caps, will you really be happy? Life's too short to be unhappy and there are about a zillion other speakers you could buy instead. Will repairing the speakers make you happy? And keep in mind that almost anything you can find in pawn shop will probably also be found on eBay. (Actually, a lot of pawn shops sell through eBay.) Anyway, you might want to search eBay now and see if you can get the same speakers there, but w/o the pushed-in dust caps. jak Thanks George wrote in message oups.com... George wrote: Hey guys, a local pawn shop has a pair of JBL E90's for sale, included with them is a pair of E20 bookshelf speakers. The only problem is two of the woofers are dented in, Do you mean the round dust caps are dented on the front of each speaker driver? If only the dust caps are dented in, don't worry about it. They're only dust caps and don't affect the sound. one on the E90 and one on the bookshelf's. I contacted JBL and they said they would ship out two brand new woofers for 80 bucks. Do you think I should buy them anyway and just fix them or let them go. The E90's go for anywhere between 250 and 400 dollars and the smaller ones are 160 a piece, any thoughts? I'm not familiar with these speakers. If you like 'em, buy 'em. Also, I'm crossposting my comments to rec.audio.tech, where you might get some technical advice. Thanks George |
#6
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
neilnewsgroups wrote ...
Another BTW: The reason dust caps are so easy to push in is that there's a vacuum inside the dust cap. The reason dust caps are so easy to push in is that they are made of very thin metal foil. There is only atmospheric pressure on both sides of the cap. Look at any cross-section of a conventional cone speaker to see that there are no "sealed" areas. |
#7
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
Richard Crowley wrote: neilnewsgroups wrote ... Another BTW: The reason dust caps are so easy to push in is that there's a vacuum inside the dust cap. The reason dust caps are so easy to push in is that they are made of very thin metal foil. There is only atmospheric pressure on both sides of the cap. Look at any cross-section of a conventional cone speaker to see that there are no "sealed" areas. Some are paper, felt or plastic, it depends on the speaker. One trick is using painters tape (like masking tape but not as sticky) to pull out the dents, another is using a vacuum nozzle |
#9
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
wrote in message ... wrote in message oups.com... wrote: Another BTW: The reason dust caps are so easy to push in is that there's a vacuum inside the dust cap. No, there's not. Why would there be? If there was a vacuum inside the dustcap, there would be a resultant force that would bias the cone inwards due to the atmospheric pressure on the outside of the dustcap. A dust cap that's 2" in diameter, for example, that had a vacuum on one side would experience a net inward force due to atmospheric pressue of over 40 pounds. Does that make sense? How would such a vacuum be maintained? There's no intrinsic seal that's going to prevent pretty rapid and complete equalization of the pressure front and aft of the dustcap. The reason dustcaps are so easy to push in is that they're easy to push in. They're made of materials that are not very strong, for the most part, and they're easy target for kids and the like. The best way to avoid dents in your dust cap is to leave the grille in place. It looks nicer, and protects the dust cap from curious fingers and paws. Doing so tends to cause some substantial differences in the FR of the speaker, unless the grill was factored into the design, which is not usually the case IME. |
#10
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
wrote:
wrote: wrote: Another BTW: The reason dust caps are so easy to push in is that there's a vacuum inside the dust cap. No, there's not. Thank you for correcting that. When I wrote the above, I wasn't quite sure myself. Seems like I've seen a dust cap somewhere made of some sheer material that couldn't hold a vacuum anyway. As well as the methods already mentioned in this thread for pulling out dents in dust caps, there's another method that I've heard of, but haven't tried: making a pinhole in the front of the dustcap, then inserting a bent pin or or other L-shaped thing and pulling out the dents from inside the dust cap. I've never tried this. Actually that was mentioned by another poster, but whether accidentally or on purpose, he sent it directly to my inbox instead of here. I've done it. If the dent is not too severe, it can work (depending on the cap material...I wouldn't try it with a metal cap). If I see a speaker driver with a dented dust cap, I know I don't want that and I don't want to fix it either, so I never buy speakers with dented dustcaps. Been lucky enough so far that I've never dented a dust cap myself. It's pretty cosmetic, actually...as others have pointed out. jak (snip) |
#11
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
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#12
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
wrote: wrote: The best way to avoid dents in your dust cap is to leave the grille in place. It looks nicer, and protects the dust cap from curious fingers and paws. Doing so tends to cause some substantial differences in the FR of the speaker, unless the grill was factored into the design, which is not usually the case IME. That the grill causes SOME difference, yes. That those differences are substantial, probably not. Typically reasonable grill perturb the upper end response on the order of 1 dB or less, and are of the same magnitude and effect as moving the measurement position a few inches. The frequency response errors caused by comb filtering effect from floor and furniture reflections are typically much worse. I was working from memory of the measurements I have seen on spekaers tested and/or designed by Joe D'Appolito in Speaker Builder and AudioXpress. The comaprisons always looked pretty drastic on the HF response IIRC. |
#13
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
I never buy anything from pawnbrokerages. I consider them a blight on
society in general. |
#14
Posted to alt.home-theater.misc,rec.audio.tech
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would you buy them
Bret Ludwig wrote:
I never buy anything from pawnbrokerages. I consider them a blight on society in general. They are nearly the first place I turn when looking for new (old) gear. Just today I bought a pair of mint EV ND767's for around $100. jak |