MikeFord Posted August 17, 2011 Share Posted August 17, 2011 I found a couple Speakerlab w1200R woofers local to me, wondering how they might do as replacements for the bashed cone K22's in my Heresy I speakers? There is a tech sheet of TS parameters on audiokarma, but I can't see images until I am approved by the moderator. Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 17, 2011 Share Posted August 17, 2011 Should work just fine. It was designed for a sealed cabinet. May be a difference in sensitivity. Quote Link to comment Share on other sites More sharing options...
MikeFord Posted August 17, 2011 Author Share Posted August 17, 2011 I found a .jpg of the TS parameters, but they didn't include a figure for efficiency. Its the W1200R, and one odd point the seller says he measured the resistance as 34 ohms, but maybe he messed up and its 3.4? I'm going to ask him. Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 17, 2011 Share Posted August 17, 2011 Plug the parameters into your favorite simulation software and you should get sensitivity. IIRC the W1200R, later rebranded W1208R, has a bigger magnet than the K22, so all other things being equal, it should be more sensitive. Don't know off hand how the other factors that affect sensitivity compare. Yeah, I saw that 34... Typically, 8 ohm speakers have a DC resistance around 6 ohms, plus or minus a few tenths. However, it is possible to have lower resistance depending on how the voice coil is wound. A notable example of that is the EV15WK, a 16 ohm speaker with a 3.2 ohm DC resistance, So, 3.4 might be OK for the W1200R. What do the TS parameters say? Quote Link to comment Share on other sites More sharing options...
MikeFord Posted August 17, 2011 Author Share Posted August 17, 2011 I wasn't sure that image would work, or stay working, so I am typing the info here. I don't have a favorite TS program right now, haven't touched speaker building in a good 10 years or "yipes" more, any suggestions? W1200R Construction Maximum diameter 12.01" Outside depth 6.44" Magnet material weight 19 oz. Magnet material Alnico Total weight 8.31 lb. Voice coil type 2 Layer Voice coil diameter 2" Surround type butyl rubber Baffle opening diameter 11.19" No. of mounting holes 8 Performance Natural resonant freq, Fs (5) 20.2 Hz Moving mass, Mc (6) 71 g Compliance, Cms (6) .87 mm/N Compliance, Vas (7) 12.0 ft3 Magnetic ?ux density in gap, B (8) 7,700 G Bl product.Bl (9) 8.9 T-m Voice coil DC resistance, RE 5.8 Ohms Effective piston area. SD (10).053 m2 Mechanical Q, OMS (11) 2.87 Electrical O, Qes (11) .59 Total Q, Qts (11) .49 Application Minimum recommended power (12) 15-25W Maximum recommended power (13) 100W Maximum recommended crossover frequency 1 kHz Rated impedance (14) 8 ohms Recommended sealed enclosure volume 2.0 +- .5 ft3 Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 18, 2011 Share Posted August 18, 2011 So, the speakers should read 5.8 ohms plus or minus a bit. Do you supposed the guy just doesn't know how to use a meter? 34 doesn't make sense. Quote Link to comment Share on other sites More sharing options...
MikeFord Posted August 18, 2011 Author Share Posted August 18, 2011 He is using a Fluke T5-600, an electricians meter with a 1000 ohm resistance range, but he measured them again and got 14, which makes me think something is wrong with meter or technique. I live about 25 min away, thought it was much closer but he is in Costa Mesa and listed location as Orange, as in Orange county, and I am in Orange, the city within the county. I may try to pay him a visit on Saturday, but if I do it will include an offer to buy them on the spot. So many interesting options, and these really at best would be OK. SP12B or McCauley 6234 could be fun, even if the 6234 wouldn't have much bass. I'm planning on just letting it ride, and buying whatever turns up as the best deal with shipping. Quote Link to comment Share on other sites More sharing options...
Heritage_Head Posted August 18, 2011 Share Posted August 18, 2011 I found a couple Speakerlab w1200R woofers local to me, wondering how they might do as replacements for the bashed cone K22's in my Heresy I speakers? There is a tech sheet of TS parameters on audiokarma, but I can't see images until I am approved by the moderator. Speakerlab what a great speaker in there day! I have two pairs of these (black grills though) in storage with the W12O8R drivers. Amazing bass from those speakers! Quote Link to comment Share on other sites More sharing options...
Heritage_Head Posted August 18, 2011 Share Posted August 18, 2011 I think the w1200R is pretty old probably what 1973? What kind of shape are they in? Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 19, 2011 Share Posted August 19, 2011 ...he measured them again and got 14... Check the listing again. He went out and got a new $3 meter that reads right. So many interesting options... Yeah, but the funny thing is they all seem to sound the same until they reach their mechanical limits. Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 19, 2011 Share Posted August 19, 2011 What kind of shape are they in? They look just fine and resistance checks out. They have a butyl rubber surround that doesn't deteriorate the way some other surrounds do. Quote Link to comment Share on other sites More sharing options...
MikeFord Posted August 19, 2011 Author Share Posted August 19, 2011 I think it would be best if only a local buyer gets them, too risky for something that old to be shipped. I "think" they are from the SpeakerLab 3, but I've also read that the shift to calling the woofer a W1208R was just to indicate 8 ohm, same basic driver. More bass makes me wonder if they aren't a fair amount lower in efficiency? Quote Link to comment Share on other sites More sharing options...
MikeFord Posted August 19, 2011 Author Share Posted August 19, 2011 So many interesting options... Yeah, but the funny thing is they all seem to sound the same until they reach their mechanical limits. Not surprising really, exclude the low bass and guitar only drivers, and how many options for a "type" of high efficiency vocal range driver in a 12" frame could you have? Put them in a Heresy box with Heresy crossover and the frequency range is even more limited, but I suspect side by side SQ preferences might not be subtle. At least I hate to think my time looking at options isn't totally wasted. What gets me, with the 5 speakers below I am still thinking about the deals that must be ahead due to the 125 pairs of Heresy's on ebay right now. At some price point I have to guess everybody on the forum might want a pair or two. Quote Link to comment Share on other sites More sharing options...
Heritage_Head Posted August 19, 2011 Share Posted August 19, 2011 Can you post a pic? Quote Link to comment Share on other sites More sharing options...
MikeFord Posted August 19, 2011 Author Share Posted August 19, 2011 Can you post a pic? I'm a little picture posting challenged on this forum, it doesn't seem to self host images? Here is a link to the ebay listing with many pictures, but it looks pretty much like a speaker. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280725380711 Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 19, 2011 Share Posted August 19, 2011 ...I suspect side by side SQ preferences might not be subtle. Well, I have Heresys with ElectroVoice, CTS and Eminence woofers as part of the same system, and I cannot tell the difference even though the measured TS parameters varied quite a bit. I think it is just a function of the sealed enclosure. Seems to be very insensitive to variations in parameters unlike some other designs. Quote Link to comment Share on other sites More sharing options...
Heritage_Head Posted August 19, 2011 Share Posted August 19, 2011 I don’t like that the dust caps are dented but if you don’t mind I’m sure it will sound good maybe even better than before. (Huge fan anything speakerlab) [] Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 20, 2011 Share Posted August 20, 2011 I don’t like that the dust caps are dented... Picky, picky... Quote Link to comment Share on other sites More sharing options...
Heritage_Head Posted August 20, 2011 Share Posted August 20, 2011 I don’t like that the dust caps are dented... Picky, picky... Lol if I was replacing a driver I would want it to be at least mint to the eyes [] Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 21, 2011 Share Posted August 21, 2011 Dust caps are easy and very inexpensive to replace. Quote Link to comment Share on other sites More sharing options...
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