Another inductor thread--The Little Guys
Schurkey
Posts: 2,102
I'm torn between tacking this into an existing inductor thread and derailing it...or starting yet another thread and maybe duplicate a lot of what's been covered already.
ALL of the recent inductor replacement discussion is with the one-per-cabinet, large inductor on the ground side of the SDA drivers...right? For the newer speakers, this seems to be the same value inductor--16 mH; but on my SDA 1B it's listed as 9.6 mH.
Nobody is playing with the much smaller inductors in the tweeter circuits (often .4 or .7 mH); or the inductor on the + side of the mid-woofers--typically 1 to 2 mH?
It'd be easy enough--and not so expensive--to replace the tweeter and MW inductors, I get the sense that there's various reasons (of which I am ignorant) to NOT change them. Correct? If not, and if an "audiophile approved" inductor change will improve the sound quality...I have some interest in replacing a .4 mH inductor that drives the top tweeter in my 1Bs, while leaving the existing .4 mH which in combination with a resistor, bleeds current off directly to the - terminal. Lower DCR in the tweeter-driving inductor would boost the tweeter volume slightly, and in my case that'd be a good thing: I'd hope for a clarity improvement as well. Lower DCR in the second inductor would bleed more current, tending to reduce the volume of the tweeters, and making life more difficult for the amp. Would replacing one but not the other "unbalance" the high-frequency crossover? Do those inductors need to have near-identical characteristics for some reason?
I don't know what to think about the small inductors in the + side of the MW circuits.
ALL of the recent inductor replacement discussion is with the one-per-cabinet, large inductor on the ground side of the SDA drivers...right? For the newer speakers, this seems to be the same value inductor--16 mH; but on my SDA 1B it's listed as 9.6 mH.
Nobody is playing with the much smaller inductors in the tweeter circuits (often .4 or .7 mH); or the inductor on the + side of the mid-woofers--typically 1 to 2 mH?
It'd be easy enough--and not so expensive--to replace the tweeter and MW inductors, I get the sense that there's various reasons (of which I am ignorant) to NOT change them. Correct? If not, and if an "audiophile approved" inductor change will improve the sound quality...I have some interest in replacing a .4 mH inductor that drives the top tweeter in my 1Bs, while leaving the existing .4 mH which in combination with a resistor, bleeds current off directly to the - terminal. Lower DCR in the tweeter-driving inductor would boost the tweeter volume slightly, and in my case that'd be a good thing: I'd hope for a clarity improvement as well. Lower DCR in the second inductor would bleed more current, tending to reduce the volume of the tweeters, and making life more difficult for the amp. Would replacing one but not the other "unbalance" the high-frequency crossover? Do those inductors need to have near-identical characteristics for some reason?
I don't know what to think about the small inductors in the + side of the MW circuits.
Post edited by Schurkey on
Comments
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This would be an interesting discussion if anyone has experience replacing the smaller inductors. I'm awaiting a few parts (and some time) before starting the Gimpod XO rebuild, Larry's Rings, Spikes, I/C upgrades and have thought about building a complete XO and keeping the old ones as backups. I realize inductors don't 'wear out" per se but thought it might be worth exploring before I start. Any input / thoughts on the smaller inductors would be appreciated.Sony 60'' SXRD 1080p
Amp = Carver AV-705THX 5-Channel
Processor = NAD T747
Panasonic BD35 Blu-Ray
Main = SDA-1C Studio with RD0s, spikes, XO rebuild, rings, I/C upgrade
Center=Polk CS10, Surround = Athena Dipoles, Sub= Boston 12HO
Music/Video Streaming = Netgear NEO550
TT = Audio Technica -
The objective to replace the large SDA inductor is lower DCR, more low bass control, and better cone damping by tighter coupling the drivers to the amp. The small inductors have fairly low DCR so there is little to be gained by changing them. Plus there is a risk of changing the XO point or the XO output in a bad way.'65 427 Shelby Cobra
'72 Triumph TR-6
__________________
'88 Polk SDA SRS 1.2, with upgraded XO caps and Erse SDA inductors
'86 Polk SDA CRS+
'84 Polk Monitor 10A (Peerless tweeters)
'05 HSU VTF-3 Sub (Original OEM)
'20 HSU VTF-3 Sub (three more, 100% cloned)
'93 Carver TFM-35
'88 Carver M-1.0t
'88 Adcom GFT-555
'88 Adcom GFP-555
'88 Adcom GFA-555 (upgraded/restored)
'88 Adcom GFA-555 (a second one upgraded/restored)
'05 Onkyo DV-555 media
'89 Fosgate 360 Digital Space Matrix
'89 Fosgate 360 Digital Space Matrix, internal surround amp bridged to drive only a center channel
'91 Kenwood Basic M1D Amp
'89 Pioneer Laser Disc media
'89 Sony SuperBeta HiFi media
One PGA2310 based custom built remote volume control
Four Polk T-15's
Four Polk TSi-200's
Four Polk TSi-100's
Two Polk CS-10's -
Would the Big Guys be Sherlock Holmes-like "Deductors", then? Just kidding guys! I couldn't resist because the lingo is so Techie and I'm a bit sleep-deprived.
cnhCurrently orbiting Bowie's Blackstar.!
Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
[sig. changed on a monthly basis as I rotate in and out of my stash] -
For what it's worth: ERSE is offering to CUSTOM UNWIND inductors to achieve the specific inductance you want. Bear in mind that my 1Bs use a 9.6mH inductor where the newer units use a ~16-something mH inductor.
From two e-mails I received from them:If you order 2 ESQ55-16-10000 we can dewind them to exactly 9.6mH for a $10 each fee.Can you send us the inductors ? We can offer you an EXACT DCR reading. Handle held meter will not offer a TRUE DCR Reading.
Generally the lower DCR between the amp and actual driver the better. This offers a lower Q not just low DCR. So not only will you get more efficiency but better control. The amplifier will couple better to the driver giving better performance. In a nut shell with series inductors try to get rid of DCR wherever possible.
We offer the dewinding to all customers ok to post. Just need to integrate the de winding option into our site.
Best regards,
The ERSE Audio Sales Team
email: sales@erseaudio.com
website : www.erseaudio.com
Placing my order soon. I think I will NOT take them up on the custom de-winding so I can tune by ear, but others might disagree.Remove about 5 turns to get 9.6mH.
