dwmcclure Posted January 19, 2018 Share Posted January 19, 2018 I am a noob on the forum and would greatly appreciate help from the community. I picked up a pair of beautiful Model H speakers and would like some help. Links to pics are embedded below. Could use some help with the following: Identify Age - back label is too faint for me to make out serial number. Model looks like HWO12 Pic of speakers face and open back - https://app.box.com/s/6kf8jz39rfhq3z0ulimt2tl7r6yx4ujf Pic of Model H pair next to a Kg4-WO - https://app.box.com/s/7cerrpupwj4hzf9v1nv1a2s2xgdh8hux Pic of Label - https://app.box.com/s/4impoxb2o9h3ypx0n3m3m7sv2dr22i6k Identify Crossover network Pic of open back speaker - https://app.box.com/s/q9c957sjog19wnkp1dtk9blqrftxmnak Pic of Crossover network - https://app.box.com/s/q9c957sjog19wnkp1dtk9blqrftxmnak Pic of Crossover label (looks like 4 RB punched in metal) - https://app.box.com/s/h1yefqj5r7hw41tycfip327e9n5ffnou Additional pics and info tweeter K77 #2935 - https://app.box.com/s/9gdk1jb4bpibpkf6f5r6akvxc71tl3qs squawker horn K1000 - visible in tweeter pic above squawker driver K55V - #3932 - https://app.box.com/s/4eto906m17nthw20gz0e6idligsw4raf woofer K22 #1941 - https://app.box.com/s/x128dkhu1auiuu1lugd0mauhz011mkvi woofer surround is orange/reddish When I check the impedance of each speaker at the terminals on back I get readings of 12.4 ohms on one and 8.2 ohms on the other. Is this an indication of a bad crossover network in the one reading 8.2 ohms? I think these are 16 ohm speakers and in an thread on this forum I read that 12.4 ohms is in the expected range for a 16 ohm speaker. I have two pairs of KG4's of different vintage that I tested with a meter and found the following: Pic of Kg4-WO label - https://app.box.com/s/yjb1ehejktf518hpnfh1xi86o75vdzr8 Nominal Impedance on label 4 ohms impedance measured on one is 4.5 ohm on the over is 7.9 ohms Pic of Kg4-Oak Oil label - https://app.box.com/s/3b8oakziy6e36budpnuz888gjlf87iq4 Nominal Impedance on label 6 ohms impedance measured on one is 4.5 ohm on the over is 4.6 ohms What should I take away from the measurements I've taken? Quote Link to comment Share on other sites More sharing options...
wvu80 Posted January 19, 2018 Share Posted January 19, 2018 Brief note, to get you started. I wasn't sure what a model H was until you listed HWO. That would be a Heresy, Walnut, Oiled. That would be the first model run, as opposed to a Heresy II. 39 minutes ago, dwmcclure said: When I check the impedance of each speaker at the terminals on back I get readings of 12.4 ohms on one and 8.2 ohms on the other. Is this an indication of a bad crossover network in the one reading 8.2 ohms? I think these are 16 ohm speakers and in an thread on this forum I read that 12.4 ohms is in the expected range for a 16 ohm speaker. The speakers (all three drivers put together in a box) should have a nominal 8 Ohm resistance. The K-77 is a HF compression driver and is 8 Ohms. The K-55v is a squawker (mid-driver) compression driver and is 16 Ohms. I'm not sure about the woofer which is a direct radiator (not horn driven) I'm not sure what the values should measure out to, but two different numbers means something is wrong. I would not suspect the crossover (XO) I would suspect one of the drivers diaphragm is blown. Replacements are available from crites.com. If you do need to replace one, check with the people here as you will probably want to upgrade for a sound improvement, not replace, at the same price. Welcome to the Klipsch Forum, you picked up some nice speakers! Quote Link to comment Share on other sites More sharing options...
dwmcclure Posted January 19, 2018 Author Share Posted January 19, 2018 Thank you for the response. According to the datasheet for the Model H found here - http://images.klipsch.com/Spec_700600_H_(still_not_Heresy)_635164929916924000.pdf they are 16 ohm speakers. I pulled the backs off and tested each driver: Speaker 1: Tweeter 9.9 ohms - squawker 11.0 ohms - woofer 10.8 ohms Speaker 2: Tweeter 8.8 ohms - squawker 11.3 ohms - woofer 6.8 ohms Quote Link to comment Share on other sites More sharing options...
Peter P. Posted January 19, 2018 Share Posted January 19, 2018 I was gonna suggest any variation of 10% or more between the two speakers' resistance readings would mean something is wrong. The 6.8 ohm woofer is low. I'd merely play them and see if you hear any differences between the two speakers. Only if it's audible to you would I bother taking action. In that case, I'd watch eBay for an exact replacement. Due to their age, that might be hard to come by. A second alternative would be to buy two matching woofers. Here again, finding woofers with a similar DC resistance might be difficult due to their less than common availability. I think my first option would be your only option, unless the woofer voice coil could be repaired. I say play 'em until the right replacement pops up on eBay, and you're convinced you need one. Quote Link to comment Share on other sites More sharing options...
Tony Whitlow Posted January 19, 2018 Share Posted January 19, 2018 I was gonna suggest any variation of 10% or more between the two speakers' resistance readings would mean something is wrong. The 6.8 ohm woofer is low. I'd merely play them and see if you hear any differences between the two speakers. Only if it's audible to you would I bother taking action. In that case, I'd watch eBay for an exact replacement. Due to their age, that might be hard to come by. A second alternative would be to buy two matching woofers. Here again, finding woofers with a similar DC resistance might be difficult due to their less than common availability. I think my first option would be your only option, unless the woofer voice coil could be repaired. I say play 'em until the right replacement pops up on eBay, and you're convinced you need one.Klipsch would have the woofers you need. It was interesting that they only went down to 70hz. The modern Heresys go down to 50hz. The factory is in Hope Ark. the folks their are very kind and helpful.Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
JohnA Posted January 19, 2018 Share Posted January 19, 2018 17 hours ago, dwmcclure said: I am a noob on the forum and would greatly appreciate help from the community. I picked up a pair of beautiful Model H speakers and would like some help. Links ........................................... What should I take away from the measurements I've taken? Nothing. To measure a speaker and get meaningful results, takes some pretty good test gear, but there are PC programs that will do it, now. It is different at every frequency. Measuring resistance at the terminals only gets you the resistance of the woofer and any inductor it has in series. Remove the leads of each driver from the crossover and measure the Re of that. More "Modern" K-77s with an 8 ohm rating will measure very close to 7.2 ohms Re. The earliest K-77s, rated at 16 ohms measure a little higher, but I've never had one and don't remember what others have measured for Re. The K-55-V has changed very little over the years and is still in production. It should measure about 11.5 ohms Re. https://www.atlasied.com/f/681/ATS004136 PD Series Datasheet RevA.pdf Some variation is reasonable, 5% is common, 10% would be the upper limit, but you won't find replacements for those EV drivers now days, so if they play, run them. I have a 1967 H700 that I'd like to match with that same woofer, so if you still get wonky readings, I can dig it out and see what mine measures. By removing and replacing the connections to each driver, you will scrub off any corrosion that may give you elevated readings, such as you have. It will be good to loosen and retighten all of the screw connections. It is always possible a driver was replaced in the last 50+ years. For the date, look for numbers/letters stamped in the edge plys of the back of the cabinet. Your Model Hs are surely 1960s era. If you find a stamped code, this will help you decode it. If they do not have a serial number stamped in the rear edge, look for date codes on the drivers. https://www.tedweber.com/speaker-codes-application/ Those woofers are EVs and so are the tweeters. The squawker driver is made by Atlas. I have recently seen a Heresy with the serial number in the back plate. They do look very much like H-WO-12s and in sweet, sweet condition. If, after listening to them a while, you notice they sound dull and distant, it is likely they need new capacitors. Welcome to the Forum! You are among friends. Quote Link to comment Share on other sites More sharing options...
JohnA Posted January 19, 2018 Share Posted January 19, 2018 8 hours ago, Tony Whitlow said: Klipsch would have the woofers you need. It was interesting that they only went down to 70hz. The modern Heresys go down to 50hz. The factory is in Hope Ark. the folks their are very kind and helpful. Sent from my iPhone using Tapatalk Heresy Is are -5 dB at 70 Hz when measured on a table firing up. This is two of mine. Quote Link to comment Share on other sites More sharing options...
Tony Whitlow Posted January 19, 2018 Share Posted January 19, 2018 Heresy Is are -5 dB at 70 Hz when measured on a table firing up. This is two of mine. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Tony Whitlow Posted January 19, 2018 Share Posted January 19, 2018 Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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