Did I just screw up my 1C's???
nspindel
Posts: 5,343
I opened them up tonight to swap out the inductors and install the Erse's that I pulled from the 2B's I'm selling.
Just out of curiousity, I put my multimeter across the speaker posts. The right channel is measuring 4 ohms, but the left channel is reading 8.4 ohms. Not quite sure what I could have screwed up here, any ideas???
And no, I didn't check the metering before I pulled the stock inductors, so I have no idea if it was like this before....
Just out of curiousity, I put my multimeter across the speaker posts. The right channel is measuring 4 ohms, but the left channel is reading 8.4 ohms. Not quite sure what I could have screwed up here, any ideas???
And no, I didn't check the metering before I pulled the stock inductors, so I have no idea if it was like this before....
Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
Post edited by nspindel on
Comments
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Found it, snapped one of the leads off the XO out to the inductor. Easily fixed...Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
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Found it, snapped one of the leads off the XO out to the inductor. Easily fixed...
What a relief !
Glad you found it and it is repairable.Speakers: SDA-1C (most all the goodies)
Preamp: Joule Electra LA-150 MKII SE
Amp: Wright WPA 50-50 EAT KT88s
Analog: Marantz TT-15S1 MBS Glider SL| Wright WPP100C Amperex BB 6er5 and 7316 & WPM-100 SUT
Digital: Mac mini 2.3GHz dual-core i5 8g RAM 1.5 TB HDD Music Server Amarra (memory play) - USB - W4S DAC 2
Cables: Mits S3 IC and Spk cables| PS Audio PCs -
Thanks. Btw, got the t-nuts today. Thanks again!!!Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
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That kind of stuff will give you gray hair.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
4 ohms, good to go!Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
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Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
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Never realized these speakers were 4 ohms, I always thought they were 6. The Krell I'm getting next week pushes 500w into 4 ohms. Yeah, that oughtta suffice...Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
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I thought I had 6 ohm 2bs about a year ago untill I got a MM.I was pleased to find mine are 4 ohms.Is that rare to have 4ohm 2Bs?SDA-2BTL with custom IC
Adcom 565 monoblocks--Monarchy Audio M-10 preamp
Theta Data Basic Transport--Stello DA100 Signature DAC--Camelot Dragon Pro2 MK III
Harman Kardon T-55c TT
DH Labs Q-10 Signature Speaker Cables With Furez silver plated copper bananas
Revelation Audio Labs Prophecy Cryo-Silver Reference AES/EBU
Revelation Audio Labs Prophecy Cryo-Silver i2s digital cable
4 Furutech FP-314Ag with FI-11cu Plugs/FI-11AG IECs--- Power Cords
DH LABS REVELATIONS ICs-amps
Revelation Audio Labs Paradise cryo-silver ICs-Source to pre -
The 2b's I'm about to sell to Big Dawg measure 4. The 1C's are actually measuring 3.6, that's probably because the resistance of the Erse inductor is lower (the whole point of using it...)Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
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The DCR across your binding posts is not the speaker's true impedance.
A speaker that measures 3.2-3.6 is more than likely 4ohms nominal, 6-7 is closer to 8ohms, etc... The only way to know for sure is to use a tool such as Woofer Tester 2 or 3."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 -
ah, never realized that. well, the DCR was certainly good enough to find the broken lead in the XO, that's all I really care about
Good music, a good source, and good power can make SDA's sing. Tubes make them dance. -
Question... If I were to change an iron core inductor on a crossover with an air core inductor with the same value in millihenries but the impedance is different, will that make a big difference?
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Yes, I would think so.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Do you mean different DCR's? I would look for an air core with a DCR as close to the original as possible, otherwise you might throw the speaker's balance off."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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Presumably the iron core has a lower impedance, no? I just did exactly the opposite for this reason. The lower impedance definitely gives the bass a bit of extra oomph.Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
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Anyone remember where that thread was where we talked about this? IIRC, Matthew Polk himself chimed in. I never subscribed to it....Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
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Ah, here it is, F1 got the quote from MP:
http://www.polkaudio.com/forums/showthread.php?t=66983
jon s, give that a read...Good music, a good source, and good power can make SDA's sing. Tubes make them dance. -
You don't see posts like #21 in that thread every day...
As for me, I've been quite happy with the Erse inductors, but that's probably because my speakers are in a small room so I don't push them very hard. In a larger room I might see some of the saturation issues described, but at the lower levels where I listen the Erse certainly is very pleasing.Good music, a good source, and good power can make SDA's sing. Tubes make them dance. -
Also, with respect to the saturation concerns, I just looked up the Erse on PartsExpress. While it doesn't give explicit specs, it does say this:
"Finally, a sonically superior magnetic core coil! The Super Q line features a specially shaped core that allows for optimal magnetic performance and increases the coil's effective permeability. The result is extremely low DC resistance, reduced distortion and very high saturation levels. The coils are encapsulated in a plastic housing, which eliminates any magneto striction distortion and makes mounting a breeze. The 500 watt power rating makes these coils perfect for high power prosound applications."Good music, a good source, and good power can make SDA's sing. Tubes make them dance. -
Correct it's the just the measure of pure resistance to DC.Impedance is the measure of resistance to AC plus any inductance ,capacitance.The DCR across your binding posts is not the speaker's true impedance.
If the DCR values are reasonably close you should be fine.The air core has the potential to improve sound quality if the iron core was prone to saturation.Question... If I were to change an iron core inductor on a crossover with an air core inductor with the same value in millihenries but the impedance is different, will that make a big difference?Testing
Testing
Testing
