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| Thread ID: 65963 | 2006-02-06 07:12:00 | Audio - Replacement Tweeters? | Murray P (44) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 427687 | 2006-02-06 07:12:00 | I have a pair of old (1978) AEL (Adio/Lab) 35 watt 3 way speakers which I have resurected after many years . Problem is the tweeters, one more so, have an annoying high pitched crackle which sounds on closer listening like little stones rattling . I have an idea I know how this happened :groan: Anyway, the existing tweeters are Philips mylar dome AD 0160 T8 8 Ohm, 2000 ~ 22000KHz, Resonance 1000 Hz, 40 Watt Max; Philips no longer make speakers . The other speakers are: 150mm 8 Ohm Plessey, no other info and, 300mm Pilot 8 Ohm 30 ~ 6000Hz , 25 watt input, no other info . I have no idea whether the crossover is passive or direct . The board in the enclosure has 2 smallish and 2 larger coils and a bunch of caps of various sizes and there is an output control for the midrange on the front panel . Most of the replacement tweeters I've managed to find on the net, in NZ, are in the 3000/3500~20000KHz range, the others are exorbitantly priced . Would it be ok to throw the cheaper tweeters in (up to $70-/pr), any implications for the crossover, any particular thing/spec to look out for? Could the fault lie elsewhere? |
Murray P (44) | ||
| 427688 | 2006-02-06 10:02:00 | These are active tweeters: here (homepages.ihug.co.nz) Murray at your age your high frequency hearing will be shot anyway, so the cheaper ones would be fine! Crossover will be "passive" if there is no external power supply, unlikely that the tweeters are "direct" connected (I hope). Plessey speakers. Oh dear, that brings back memories. There are better speakers out there (hint). Just watch the power ratings relative to what you are driving it with. |
godfather (25) | ||
| 427689 | 2006-02-06 11:24:00 | These are active tweeters: here ( . ihug . co . nz/~mwallis/birds_for_sale . htm" target="_blank">homepages . ihug . co . nz) Murray at your age your high frequency hearing will be shot anyway, so the cheaper ones would be fine! Crossover will be "passive" if there is no external power supply, unlikely that the tweeters are "direct" connected (I hope) . Plessey speakers . Oh dear, that brings back memories . There are better speakers out there (hint) . Just watch the power ratings relative to what you are driving it with . This is an my active tweeter ( . artshole . co . uk/arts/artists/Richard%20%20Jordan/Crow . jpg" target="_blank">www . artshole . co . uk) . Whassat you say? speak up man, don't be shy now ;) Ok, I'm not going to get the benefit of the full range and, you don't see any issues with the crossover point being likely to be a bit different from that designed? or I'm not going to hear that either? Got any hints on good suppliers . Jaycar have a couple in stock, there's a crowd in Ch CH with oodles listed but, less in stock and no info on the speakers specs (yeah, I'll google) . I'm a bit wary of the Auto specialists because the speakers need to do a rather different job in an enclosed vehicle cabin, less so in respect to the tweeters though, I guess . No not direct, active was the word I should have used instead . New to this Goddie . Hmm, I'll leave replacing the Plessey's for a little later, after I've done the tweeters and built new enclosures . The woofers seem to be fine at least, quite a decent sound actually, I say quite a decent sound actually :D Ta :thumbs: |
Murray P (44) | ||
| 427690 | 2006-02-06 17:56:00 | I take it you are in wgtn murray? If so give the tv repair shop in newlands a call, I think there name is Advanced something. They did a great job of repairing one of my Image speakers many years ago. Just looked up there number: 478 3065 | plod (107) | ||
| 427691 | 2006-02-06 21:13:00 | Cheers Plod :thumbs: | Murray P (44) | ||
| 427692 | 2006-02-07 20:20:00 | Hmm, I'll leave replacing the Plessey's for a little later, after I've done the tweeters and built new enclosures . The woofers seem to be fine at least, quite a decent sound actually, I say quite a decent sound actually . Plessey speakers were previously branded Rola, then Plessey-Rola . They were definitely not known as a manufacturer of quality speakers . The existing tweeters are 8 ohm so any 8 ohm tweeter will substitute ok . The crossover network is very simple and is not tuned to the individual speaker frequency response in any way . It is a simple broadband frequency divider . It is fine to do this as a restoration project Murray, but the result will not be high fidelity in the accepted meaning of the words, and you can buy superior performance for very little money these days . Many years back I bought a pair of Sony 3-way Hi Fi enclosures and they were very good, but a few years ago I bought a set of small 2-way bookshelf enclosures for around $120 . They were in heavy metal enclosures and just blew the socks off the Sonys . They could run at up to 50W rms and they could produce all the volume the neighbours would stand . For a while I ran with a Sony for the left channel and a bookshelf to the right (domestic issues of space for objet d'art, no doubt you understand) and quite frankly, apart from a minor advantage in deep bass, the bookshelf was my preferred source . If you build new enclosures, use a published design and treat yourslf to good speakers, the old jobbies seriously won't cut it . Cheers Billy 8-{) |
Billy T (70) | ||
| 427693 | 2006-02-08 01:21:00 | Would you like a couple of David Reid twin cone 8" speakers. I've got some somewhere. Real mellow tone. :D | Graham L (2) | ||
| 427694 | 2006-02-08 01:44:00 | Thanks for the input Billy . The speakers are becoming a bit of a project, I now want to do out of interest rather simply repairing, so your advice is apt . Funnily enough, last evening I was about to chuck in some no name tweeters out of a newer (mid 90s) Pioneer system which didn't stack up speaker wise against the older speakers but would give me a temporary solution to the rattling tweeter while I researched/decided my next move . I thought I'd compare the respective tweeters one last time (using Nick Drake, Five Leaves Left all the while), lo and behold, the nasty crackle rattle has gone, not perfect but, superior to the other tweeters on both channels (one being previously worse) . What has happened, this suggests an amp issue, does it not . The only thing I've done is move the amp with cabinet a metre or so to access it (a few times) and change a the wires over a few times, that and pulling all the speakers out of one enclosure while still wired though . Or could it be interference (the crackle has been around before in diff locations though) . This is well beyond my capabilities to figure out, maybe I should just enjoy until I build new, then the amp (which is barely capable now) will need to be upgraded . Looks like the project has got way bigger than a simple tweeter swap, more enjoyable too . |
Murray P (44) | ||
| 427695 | 2006-02-08 01:50:00 | Would you like a couple of David Reid twin cone 8" speakers. I've got some somewhere. Real mellow tone. :D I hesitate to look a gift horse in the mouth GL, but, David Reid does not compute. A quick google, without delving too deep, came up with a seminar speaker, should I be searching antique fairs ;) |
Murray P (44) | ||
| 427696 | 2006-02-08 01:55:00 | Another young one who doesn't remember David J Reid Electronics, once one of the major electronics distributors in NZ. :( | Graham L (2) | ||
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