gary_wong5 Posted December 27, 2007 Report Share Posted December 27, 2007 Dear All,I bought a pair of AR98ls yesterday. They are really sound great! But I am now confused why my AR98ls' look differrent from the one shown in AR Library:http://www.classicspeakerpages.net/library...series_brochur/ whereby the front face is black colour.Is that my ARs' have already modified by the previous owner(s)? What is the function of the small knob situated above the speaker socket (please see the attached picture)? Can anyone suggest me how to restore the dented midrange driver? Please help!Regards,Gary Quote Link to comment Share on other sites More sharing options...
roundhome Posted December 27, 2007 Report Share Posted December 27, 2007 Dear All,I bought a pair of AR98ls yesterday. They are really sound great! But I am now confused why my AR98ls' look differrent from the one shown in AR Library:http://www.classicspeakerpages.net/library...series_brochur/ whereby the front face is black colour.Is that my ARs' have already modified by the previous owner(s)? What is the function of the small knob situated above the speaker socket (please see the attached picture)? Can anyone suggest me how to restore the dented midrange driver? Please help!Regards,GaryHello They made three types of these first had black plastic on the front with the crossover specs printed on them next were yours wood front the next ones were the 98lsi improved crossover.the switch is for if they are on the floor our up on a book shelve thats all last as far as that small dent in the mid leave it alone you will do more harm its not that big. but if you have to I would take a small needle used to give shots pull back the plunger to fill it with air and carefully give it a shot as it fills with air it should pop out. if you don't want to do that carefully work your fingers around the dent from four sides going around it this sometimes works on new dents but older ones just pop back because of the vacume on them. this is a vary expensive driver to play with and not a easy one to find you are best to leave it alone I would read up on here to learn about the crossover caps and just set them on stands a listen to them. have fun these are vary good speakers. Quote Link to comment Share on other sites More sharing options...
Kuja Posted December 27, 2007 Report Share Posted December 27, 2007 It seems that you have second generation of 98LS speakers.Later improved 98LSI models didn't have those plastic rings around woofers and lower mids.They were improved by adding some resistors in front of lower and upper midrange, which made them smoother sounding.Also, one of the capacitors was removed in front of the tweeter and its phase was inverted too.Earlier LS version was known for producing listeners fatigue.While I was refreshing my crossovers with new capacitors, I also upgraded them to LSI versions.Here you can see the restoration I did on my pair:http://www.kujucev.com/ar98ls/ar98.htmHere is the modded LSI version of the crossover: Quote Link to comment Share on other sites More sharing options...
gary_wong5 Posted December 28, 2007 Author Report Share Posted December 28, 2007 Thank you for all the advice. Since there is no abnormal sound out from the mid, I shall leave the dent as it is. What is the suitable speaker stand's height for these AR98ls? Kuja, may I know the one shown in your picture?Thanks!BRGary Quote Link to comment Share on other sites More sharing options...
mluong303 Posted December 29, 2007 Report Share Posted December 29, 2007 Hi GaryAre you from Hong Kong? I am just guessing because in Hong Kong people are very favorable to rosewood furniture therefore they have the tendency to tint any kind of wood to reddish tint just like your AR-98LSi speakers is showing. The original AR-LSi series speakers are more of the yellowish brown walnut veneer as shown in the color brochure.One thing I would suggest you to do is to unscrew the driver screw one at a time and get rid of the rust with very fine grain cloth base sand paper and lubricate them up with WD40 to stop them from rusting further.Minh Luong Quote Link to comment Share on other sites More sharing options...
gary_wong5 Posted December 29, 2007 Author Report Share Posted December 29, 2007 Hi GaryAre you from Hong Kong? I am just guessing because in Hong Kong people are very favorable to rosewood furniture therefore they have the tendency to tint any kind of wood to reddish tint just like your AR-98LSi speakers is showing. The original AR-LSi series speakers are more of the yellowish brown walnut veneer as shown in the color brochure.One thing I would suggest you to do is to unscrew the driver screw one at a time and get rid of the rust with very fine grain cloth base sand paper and lubricate them up with WD40 to stop them from rusting further.Minh LuongHi Minh Luong,I am from Malaysia. Are you from Hong Kong?I got my pair from Singapore after long searching out. In fact I have doubt too about the reddish tint (slight) and keep on asking myself why they look different from AR LS brochure. What a pity they are not of original condition... But I really love their performance. How to tell if they are LSi version? The seller said he bought them 7 years ago as used pair from somebody. Probably the first owner is Hongkee or he had ever worked in Hong Kong. As I shall keep these LSs' for like, I thank you for your kind advice on rusty screw.Gary Quote Link to comment Share on other sites More sharing options...
mluong303 Posted December 30, 2007 Report Share Posted December 30, 2007 Hi GaryI am from South Vietnam. The AR-303 review article you mention from Sonic Review from Hong Kong was written by my friend Top Class Tom. I was the one who pushed him hard to review the AR-303 speakers so he end up had to bought a pre-owned pair to write that report to calm me down. If you still have the magazine, you will find my name was mention in the beginning of the review. One mistake in the article that the Writer and Editor never corrected as I had told them was all three drivers used in the AR-303 were no longer the same as the original AR-3a drivers. They may look similar but with different specification.The easiest way to distinguish the early LS series from the LSi series is the LSi series speakers got rid of the plastic mid bass and woofer driver guards which are more for cosmetic and not for functionality therefore the front baffle of the LSi series speakers were routed through the walnut veneer and MDF to sit all the drivers flush to the surface with updated crossover.Attached is picture of AR9LSi to see flush mounted drivers.Minh Luong Quote Link to comment Share on other sites More sharing options...
gary_wong5 Posted December 31, 2007 Author Report Share Posted December 31, 2007 Hi GaryI am from South Vietnam. The AR-303 review article you mention from Sonic Review from Hong Kong was written by my friend Top Class Tom. I was the one who pushed him hard to review the AR-303 speakers so he end up had to bought a pre-owned pair to write that report to calm me down. If you still have the magazine, you will find my name was mention in the beginning of the review. One mistake in the article that the Writer and Editor never corrected as I had told them was all three drivers used in the AR-303 were no longer the same as the original AR-3a drivers. They may look similar but with different specification.The easiest way to distinguish the early LS series from the LSi series is the LSi series speakers got rid of the plastic mid bass and woofer driver guards which are more for cosmetic and not for functionality therefore the front baffle of the LSi series speakers were routed through the walnut veneer and MDF to sit all the drivers flush to the surface with updated crossover.Attached is picture of AR9LSi to see flush mounted drivers.Minh LuongHi Minh Luong,Thank you for your explanation for LS and LSi.Yes! I saw your name in Sonic Review. I consider myself lucky as still keeping those old magazines. I started hi-fi system in 1993 and only has the chance to listen to and own my Classic 8s' last Spetember. I "addicted to" AR's sound since then, and have had let go my psb and Infinity. Now I have AR98LS, Classic 8 and M-.5 (unidentified species?!) There is AR9LS around me and could be my next target. Please suggest me any other models that are worth collecting. Thanks!Gary Quote Link to comment Share on other sites More sharing options...
mluong303 Posted January 1, 2008 Report Share Posted January 1, 2008 GaryIf the AR9LS speakers are in better condition with all original parts then I would suggest nail them down and let go the reddish AR98LS pair. Just make sure the dual dome Mid-Hi drivers units on the AR9LS sound fine since they are hard to come by! They are truly floor standing speakers which offer full spectrum of musical sound reproduction compare to the AR98LS model.Good Luck,Minh Luong Quote Link to comment Share on other sites More sharing options...
gary_wong5 Posted January 11, 2008 Author Report Share Posted January 11, 2008 Yesterday, I was free to open up my 98ls' and would like to know:1) Refer to my attached photo, is the x-over is of original and never recap before?2.) Some double-sided adhesive tape residue on the plastic grille, so I wonder if there is some plastic foam attached (original specification). I have tried putting some foam around the grill which I could hear more refined mid and bass.Please advise.Regards,Gary Quote Link to comment Share on other sites More sharing options...
mluong303 Posted January 23, 2008 Report Share Posted January 23, 2008 GaryOn the crossover shown, the two deep blue Culver caps seems like were replacement of the original? If both of your AR98LS don't have obvious sounding problem, I would suggest don't do anything with the caps change yet unless you are very handy and had done many soldering on small electronics parts before. Cold solder is the worst case on cap change! Beside you have very limited space to squeeze in the much bigger polypropylene capacitors with the same uF value even for the smaller 250VDC rated one. I would remove the yellow sponge shown on the speaker grills since it hurts the dispersion of the tweeter and midrange more than tighten up the focus as you may think!Minh Luong Quote Link to comment Share on other sites More sharing options...
JKent Posted January 24, 2008 Report Share Posted January 24, 2008 Here you can see the restoration I did on my pair:http://www.kujucev.com/ar98ls/ar98.htmBeautiful work, kuja! What is the source of that interesting cork.rubber material?Kent Quote Link to comment Share on other sites More sharing options...
Kuja Posted January 24, 2008 Report Share Posted January 24, 2008 Beautiful work, kuja! What is the source of that interesting cork.rubber material?KentThanks, The source for this cork/rubber was a local hardware shop in Belgrade, Serbia.I believe that it was imported from Italy.I bought it some two years ago and I don't know if they still have it. Quote Link to comment Share on other sites More sharing options...
JKent Posted January 24, 2008 Report Share Posted January 24, 2008 Thanks, The source for this cork/rubber was a local hardware shop in Belgrade, Serbia.I believe that it was imported from Italy.I bought it some two years ago and I don't know if they still have it.Thanks. It looks very cool. Sometimes useful items show up in unexpected places. That may be gasket material. Next time I'm in Belgrade I'll have to scour the local hardware stores! ;-)Kent Quote Link to comment Share on other sites More sharing options...
gary_wong5 Posted January 24, 2008 Author Report Share Posted January 24, 2008 GaryOn the crossover shown, the two deep blue Culver caps seems like were replacement of the original? If both of your AR98LS don't have obvious sounding problem, I would suggest don't do anything with the caps change yet unless you are very handy and had done many soldering on small electronics parts before. Cold solder is the worst case on cap change! Beside you have very limited space to squeeze in the much bigger polypropylene capacitors with the same uF value even for the smaller 250VDC rated one. I would remove the yellow sponge shown on the speaker grills since it hurts the dispersion of the tweeter and midrange more than tighten up the focus as you may think!Minh LuongHi Minh Luong,Frankly speaking I have no expertise in electronics. But I do guess that those Culver are replacement caps in view of the colour variant. Can anyone else help to verify this?Yes! I have remove the yellow sponge after conducting some trial and error whereby they sound most airy and transparent. There is no sounding problem so far. Actually they sound very much better than my PSB Image 4T.Best regards,Gary Quote Link to comment Share on other sites More sharing options...
gary_wong5 Posted May 9, 2008 Author Report Share Posted May 9, 2008 I need your constructive advice now!Is it worth to exchange my 98ls' with 9ls' with a top up of US$406 !??GaryHi Minh Luong,Frankly speaking I have no expertise in electronics. But I do guess that those Culver are replacement caps in view of the colour variant. Can anyone else help to verify this?Yes! I have remove the yellow sponge after conducting some trial and error whereby they sound most airy and transparent. There is no sounding problem so far. Actually they sound very much better than my PSB Image 4T.Best regards,Gary Quote Link to comment Share on other sites More sharing options...
gary_wong5 Posted June 10, 2008 Author Report Share Posted June 10, 2008 Hi Kuja,I am keen to upgrade my 98LS's cross-over to Improved version. But I am not expert in electronics. I shall show your schematic LSi to my technician and request him to carry out modification. May I confirm this is the correct LSi cross-over?Kind regards,GaryIt seems that you have second generation of 98LS speakers.Later improved 98LSI models didn't have those plastic rings around woofers and lower mids.They were improved by adding some resistors in front of lower and upper midrange, which made them smoother sounding.Also, one of the capacitors was removed in front of the tweeter and its phase was inverted too.Earlier LS version was known for producing listeners fatigue.While I was refreshing my crossovers with new capacitors, I also upgraded them to LSI versions.Here you can see the restoration I did on my pair:http://www.kujucev.com/ar98ls/ar98.htmHere is the modded LSI version of the crossover: Quote Link to comment Share on other sites More sharing options...
gary_wong5 Posted March 11, 2009 Author Report Share Posted March 11, 2009 It seems that you have second generation of 98LS speakers.Later improved 98LSI models didn't have those plastic rings around woofers and lower mids.They were improved by adding some resistors in front of lower and upper midrange, which made them smoother sounding.Also, one of the capacitors was removed in front of the tweeter and its phase was inverted too.Earlier LS version was known for producing listeners fatigue.While I was refreshing my crossovers with new capacitors, I also upgraded them to LSI versions.Here you can see the restoration I did on my pair:http://www.kujucev.com/ar98ls/ar98.htmHere is the modded LSI version of the crossover:Mr Kuja, hope that you are still enjoying yours. Recently has some free time to try out the LSi version modification. Could you please be more specific what resisitors you have added, and which capacitor has been removed? And I hope my dear members here give more advice on this, if any.Best regards. Quote Link to comment Share on other sites More sharing options...
gary_wong5 Posted March 17, 2009 Author Report Share Posted March 17, 2009 It seems that you have second generation of 98LS speakers.Later improved 98LSI models didn't have those plastic rings around woofers and lower mids.They were improved by adding some resistors in front of lower and upper midrange, which made them smoother sounding.Also, one of the capacitors was removed in front of the tweeter and its phase was inverted too.Earlier LS version was known for producing listeners fatigue.While I was refreshing my crossovers with new capacitors, I also upgraded them to LSI versions.Here you can see the restoration I did on my pair:http://www.kujucev.com/ar98ls/ar98.htmHere is the modded LSI version of the crossover:I converted my AR98LS to "i" version last night. As 2.5ohm is not readily available in Malaysia, I tried 2.2ohm instead as the shopkeeper explained that the difference is only 0.1% whereby our ear cannot hear and differentiate. Is that true? Is 2.5ohm better? No recap is done. Just added in those resistors. The mid and high are now very sweet, smooth and listenable.What I am still wondering is that the the phases of the tweeter are originally inverted: Blue (-), Yellow (+) (different from the LSi X-over). Should I restore the phase? What will happen to tweeter if re-phase? Quote Link to comment Share on other sites More sharing options...
Guest missingtime Posted November 15, 2009 Report Share Posted November 15, 2009 I tested my 2.5 ohm resistor in my 9Lsi's at 2.2 which was fine by me because I'd just melted it off the board. Quote Link to comment Share on other sites More sharing options...
Deadneck Posted December 18, 2019 Report Share Posted December 18, 2019 I picked up some AR 98 LS speakers couple weeks ago and refoamed them, but would now like to do the LSi mode. The photos of LSI crossover are not showing up and I'm having a hard time seeing the connection points and have no idea which cap to remove on the tweeter, any help from yall would be greatly appreciated. Thank you. Quote Link to comment Share on other sites More sharing options...
Aadams Posted December 18, 2019 Report Share Posted December 18, 2019 Do you have PCB or Masonite board. The mod is resistors and tweeter polarity. No caps Quote Link to comment Share on other sites More sharing options...
AR55 Posted December 19, 2019 Report Share Posted December 19, 2019 (edited) In addition to reversing the tweeter polarity and adding 1.5 ohm & 2.5 ohm resisters, I believe that the 98Lsi crossover also deleted a 5uF capacitor that the 98Ls crossover had between the tweeter and the 3uF capacitor & 0.080mH coil. Attached are copies of the 98Ls crossover schematic, the 98Lsi crossover schematic and a markup of the conversion of the 98Ls crossover to a 98Lsi crossover (note that the yellow & blue wires were reversed between the 98Ls & 98Lsi): Edited December 20, 2019 by AR55 Added crossover schematics Quote Link to comment Share on other sites More sharing options...
scottie munoz Posted June 16, 2021 Report Share Posted June 16, 2021 On 12/27/2007 at 2:14 PM, Kuja said: It seems that you have second generation of 98LS speakers. Later improved 98LSI models didn't have those plastic rings around woofers and lower mids. They were improved by adding some resistors in front of lower and upper midrange, which made them smoother sounding. Also, one of the capacitors was removed in front of the tweeter and its phase was inverted too. Earlier LS version was known for producing listeners fatigue. While I was refreshing my crossovers with new capacitors, I also upgraded them to LSI versions. Here you can see the restoration I did on my pair: http://www.kujucev.com/ar98ls/ar98.htm Here is the modded LSI version of the crossover: http://www.kujucev.com/ar98ls/AR98LSI_xover.jpg 14 years later, I just bought a set of 98ls. I'd love to read your refurb thread...especially a schematic... Thanks Quote Link to comment Share on other sites More sharing options...
Kuja Posted June 25, 2021 Report Share Posted June 25, 2021 As you said 14 years have passed. If I manage to find the original photos of my restoration, I'll post them here. Schematic, with all mods, is the same as @AR55 has posted in his post above: Quote Link to comment Share on other sites More sharing options...
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