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  • westmassguy
    westmassguy Posts: 6,850
    edited April 2014
    Perhaps inductance is playing a role here. Unlike Mills or MOX, the L-Pad contains a spiral wound, resistive wire, AKA an inductor.
    There may be some minute frequency shaping going on.
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
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  • BKphoto
    BKphoto Posts: 409
    edited April 2014
    thats the problem... its only good if its only the highs...if its for highs and mids you can't do it...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • 11tsteve
    11tsteve Posts: 1,166
    edited April 2014
    BKphoto wrote: »
    thats the problem... its only good if its only the highs...if its for highs and mids you can't do it...
    why is that?
    Polk Lsi9
    N.E.W. A-20 class A 20W
    NAD 1020 completely refurbished
    Keces DA-131 mk.II
    Analysis Plus Copper Oval, Douglass, Morrow SUB3, Huffman Digital
    Paradigm DSP-3100 v.2
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  • BKphoto
    BKphoto Posts: 409
    edited April 2014
    I've only seen conversations with 2 way speakers...i may be wrong but i think it messes with impedance if its a 3 way...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • 11tsteve
    11tsteve Posts: 1,166
    edited April 2014
    i have seen RS III(original 1981 version), RSb, and Studio Monitor threads where people felt they were successful by replacing the pots with resistors. To each their own.
    Maybe I will experiment with just one or the other driver with a resistor. I only have about 30 of them laying here.
    Polk Lsi9
    N.E.W. A-20 class A 20W
    NAD 1020 completely refurbished
    Keces DA-131 mk.II
    Analysis Plus Copper Oval, Douglass, Morrow SUB3, Huffman Digital
    Paradigm DSP-3100 v.2
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  • BKphoto
    BKphoto Posts: 409
    edited April 2014
    yeah give it a shot...are the high and mid circuit completely on their own...?
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • 11tsteve
    11tsteve Posts: 1,166
    edited April 2014
    yup. there were at least two crossover circuits used in the RSb. I currently have this one wired up.

    http://www.infinity-classics.de/technik/manuals/RSb_technical_sheet.pdf

    I tried the other one first and didn't care for it... this, I believe , was the original circuit. I have eliminated the fuse, and the pots are inside the speaker as I have a new backplate for the binding posts, and no good way to wire the pots into the circuit and have them through to the exterior.
    Polk Lsi9
    N.E.W. A-20 class A 20W
    NAD 1020 completely refurbished
    Keces DA-131 mk.II
    Analysis Plus Copper Oval, Douglass, Morrow SUB3, Huffman Digital
    Paradigm DSP-3100 v.2
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  • BKphoto
    BKphoto Posts: 409
    edited April 2014
    that mid pot is 25W...? yeah, maybe I'd keep that one in... are overheating the resistor...?
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • 11tsteve
    11tsteve Posts: 1,166
    edited April 2014
    I have the MResist which are 25W to play with for that.
    Polk Lsi9
    N.E.W. A-20 class A 20W
    NAD 1020 completely refurbished
    Keces DA-131 mk.II
    Analysis Plus Copper Oval, Douglass, Morrow SUB3, Huffman Digital
    Paradigm DSP-3100 v.2
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  • amb426amb1
    amb426amb1 Posts: 148
    edited April 2014
    Not sure why it would be so important to replace that variable resistor? i just leave my iiib's on flat and they sound great... i say deoxit and save some coin and headache. the cap replacement is really were its at.
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  • BKphoto
    BKphoto Posts: 409
    edited April 2014
    my reason is they are in crappy shape + to me its a useless adjustment...cleaned them a bunch of times and they are still scratchy....i'm getting rid of them...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • westmassguy
    westmassguy Posts: 6,850
    edited April 2014
    BKphoto wrote: »
    that mid pot is 25W...? yeah, maybe I'd keep that one in... are overheating the resistor...?
    You can parallel two Mills MRA-12s for 24 watt
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
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  • 11tsteve
    11tsteve Posts: 1,166
    edited April 2014
    amb426amb1 wrote: »
    Not sure why it would be so important to replace that variable resistor? i just leave my iiib's on flat and they sound great... i say deoxit and save some coin and headache. the cap replacement is really were its at.
    I tried when I rebuilt mine because, intuitively, it seemed like a better part would sound better. It just didn't work out that way.
    Polk Lsi9
    N.E.W. A-20 class A 20W
    NAD 1020 completely refurbished
    Keces DA-131 mk.II
    Analysis Plus Copper Oval, Douglass, Morrow SUB3, Huffman Digital
    Paradigm DSP-3100 v.2
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  • Face
    Face Posts: 14,340
    edited April 2014
    amb426amb1 wrote: »
    Not sure why it would be so important to replace that variable resistor? i just leave my iiib's on flat and they sound great... i say deoxit and save some coin and headache. the cap replacement is really were its at.
    Because generic L-Pads degrade sound quality. Replacing with high quality series and parallel resistors(or in this case, a single resistor) would make the speakers more transparent.

    As for it's wattage, a 12w Mills should be more than enough for a high frequency unit. If it was in series with the midrange, then paralleling a pair of resistors for higher wattage capacity may be needed. As I noted above, Infinity may have used these specific l-pads just because they purchased them in bulk for range of models, etc...
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • amb426amb1
    amb426amb1 Posts: 148
    edited April 2014
    I must be getting too old. i never hear these marked improvements in SQ. I have with caps... replaced several L pads in different low buck speakers That I've had years ago for this reason and could never hear the improvements when placed side by side with the same unconverted speaker model. But I don't spend 1k on IC cables either... maybe I need to improve other areas first
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  • BKphoto
    BKphoto Posts: 409
    edited April 2014
    P1010692_zps87913a34.jpg

    P1010758_zps9521874a.jpg

    still have to solder in cap on bottom of pic still waiting on resistor that is taking place of pot...

    Mills, Solen for lows, Jantzen z-caps on highs...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • amb426amb1
    amb426amb1 Posts: 148
    edited April 2014
    Looks good...so much fun working on projects. Waiting on your evaluation of these
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  • BKphoto
    BKphoto Posts: 409
    edited April 2014
    it is fun...on a tight budget with these...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • BKphoto
    BKphoto Posts: 409
    edited April 2014
    P1010759_zpseb1c0ac5.jpg

    can't hook them up until tomorrow.....kids are sleeping...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • amb426amb1
    amb426amb1 Posts: 148
    edited April 2014
    I love waking the family up in the middle of the night... well how do they sound?
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  • BKphoto
    BKphoto Posts: 409
    edited April 2014
    They sound great...quite detailed, very happy...can't wait until they burn in so I can really judge...I'll take a pic later tonight but they are each in a window so a little heavy in the bass, but that never hurt anyone...Low filter on, one click ahead on mids and highs...haven't listened to the Marantz in a while, what a great little amp...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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