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  #1  
Old 04-24-2017, 02:54 PM
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BlueSky BlueSky is offline
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Default F212 Transformer Hum - Problem solved.

Ever since getting my F212, I've been plagued with audible 60 Hz. hum coming from the F212's internal toroidal power transformer. The hum was elusive and would come and go without warning. Sometimes the hum was persistent for many minutes at a time. At other times, it was cyclical and would come and go with a periodicity of a three or four seconds between peaks and valleys. I reached out to several people who said it could be dimmers installed on the lighting or that it could be D.C. riding on the A.C. line. Disconnecting the dimmers didn't help and selectively powering down various circuits at the breaker panel didn't help. I also ran separate 10 AWG feeds from the breaker panel to the sub. I even tried both sides of the A.C. line to no avail. Heck, I even invested in a toroidal isolation transformer only to find the isolation transformer itself hummed quiet loudly.

At my wits end, I decided to invest in a little $100 device known as the Emotiva CMX-2 AC Line Restoration and Common Mode Filter. I also investigated a PS audio device that I found info on only to find that it was no longer being manufactured. The CMX-2 arrived several days ago and appeared to be a well-built and solid unit. To my utter surprise the problem has been resolved! The F212 is dead quiet even with my ear pressed against the cabinet of the sub! I can highly recommend this little gadget if you suspect you may be fighting D.C. riding on your A.C. line.
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  #2  
Old 04-24-2017, 03:34 PM
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Joe.......This is good news. Thanks for letting everyone know about the Emotive CMX-2 AC Line Restoration and Common Mode Filter. Retail $119 isn't bad if it solves issues like yours.









>Precision DC offset eliminator.

>High-quality common mode and differential mode L-C noise filtering.

>Continuous line-status monitoring - provides continuous real-time indicators that show the status of Hot, Neutral, and Ground lines.

>Power Direct Connect™ mounting system, which connects the outlets directly to the circuit board.

>Premium high-quality components and a heavy-duty double sided FR4 circuit board with high current paths on both sides.

>Two commercial grade AC outlets.

>Detachable IEC high current, 14 gauge, 2 meter power cord included.

>High reliability resettable magnetic circuit breaker.

>Constructed from machined aluminum.

>Can be mounted vertically or horizontally.
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STUDIO - McIntosh C1000C/P, MC2301 (2), MR88, Aurender N10, Esoteric K-01X, Shunyata Sigma spdif digital cable, Sonos Connect, PurePower 2000, Stillpoints, Furutech Flux 50, Michell Gyro SE, Michell HR Power Supply, SME 309, Ortofon Cadenza Black, Wireworld, Sonus faber Amati Anniversario
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Last edited by jdandy; 04-24-2017 at 03:39 PM.
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  #3  
Old 04-24-2017, 05:02 PM
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djwhog djwhog is offline
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Joe thanks, my 212 has some hum too, I have tried ground lifts and even a Furman outlet strip higher end unit and even all of that into my PS Audio conditioner, WW silver cable no help

I will order one of this asap and keep you and the thread posted.

PS Thanks so much, this will be a game changer.

My 212 even seems to add some noise when I use my MX150 but not when I am in pure 2ch mode on my C500 rig. For some reason my MX 150 even though on the same circuit as the C500 and both these even on a diff breaker and a diff PS Audio conditioner have given me fits. Sounds like your issues in similarity.

I did run another dedicated 120 circuit and another 20 amp breaker, got rid of light dimmers etc went all LED nothing and I mean nothing has helped.

When the audio system is off I power of the power to the 212 to keep it out of the loop and then even pull the power cord uggg....

Again Thanks Joe

WOW I sure hope this helps!

Can you tell me where to order at? Amazon 2-4 weeks I want it yesterday!
__________________
Dave's Cave main Basement system
C500C C500T preamp and a MX150 control center, (3)McIntosh 601 mono block amps, (1)7270 McIntosh amp driving rears in 7.1 (1)Halo A23 amp for side surround, & (1)452 McIntosh amp for main towers part of a bi-amp setup with 601's, Esoteric K-03 JL F212 sub all glued together with mostly all WireWorld & Moon Audio Black Dragon cables.

Headphone Rig
Audeze LCD-X Sennheiser hd 800 & Sennheiser hd 700 cans, Woo Audio WA-6SE with Sophia Princess & matched pair of 6GL7/6EM tubes Black Dragon Cable upgrades on the HD700s!

Streaming Dac Gear
includes K03, high-end custom built Toshiba core i7 16 gigs Wireworld Platinum USB cable, Ipad mini & Itouch driving media center 20 for full remote control anywhere on property and even via web to have music on when I get home Also can remote control MX150 via web too.

Analog Rig
VPI Classic II running with a Dynavector 20X2-H MC Phono Cartridge

Also
For living room and outside rear deck is connected to MX150 with (1)Parasound 5250 amp. Oppo 205 , Sony ES777, (1)PPP, and a DirectStream P15 Power Plant

Speaker system
Builder of custom very high end Dynaudio's 2 Main towers, 1 super tweeter Dynaudio built system above each tower, 4 surrounds all Dynaudio Esoteric drivers 6.5 mids, esoteric dome tweeters, 2 rear surrounds, and a custom 5 speaker 2 7" drivers, 2 3" domes, and a d21 tweeter in the center channel to compliment my 2 300lb custom subs and a JL F212

Misc Build Features
AC Power Electrical overview is 4 20 amp 120 circuits all 10-3 wiring extra shielding with walls custom modded with cross bracing 2x6s over a 14" thick concrete with R19 and weather barrier
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  #4  
Old 04-24-2017, 05:15 PM
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djwhog djwhog is offline
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Order update, OK I ordered direct from manufacture, nothing else has helped so hope this does not sure if it will be here this week or next?

But with the new Oppo 205 on the way Wed I use it running the MX150 so I really want this hum gone.

All my other items not to hi-jack this thread helped maybe 10-20 percent each, but hum is still bad enough it is annoying and I love the F212 so i sure hope like help this does the trick. For $119 I think it is cheap investment relative to everything I have into the system, yet alone the F212.
__________________
Dave's Cave main Basement system
C500C C500T preamp and a MX150 control center, (3)McIntosh 601 mono block amps, (1)7270 McIntosh amp driving rears in 7.1 (1)Halo A23 amp for side surround, & (1)452 McIntosh amp for main towers part of a bi-amp setup with 601's, Esoteric K-03 JL F212 sub all glued together with mostly all WireWorld & Moon Audio Black Dragon cables.

Headphone Rig
Audeze LCD-X Sennheiser hd 800 & Sennheiser hd 700 cans, Woo Audio WA-6SE with Sophia Princess & matched pair of 6GL7/6EM tubes Black Dragon Cable upgrades on the HD700s!

Streaming Dac Gear
includes K03, high-end custom built Toshiba core i7 16 gigs Wireworld Platinum USB cable, Ipad mini & Itouch driving media center 20 for full remote control anywhere on property and even via web to have music on when I get home Also can remote control MX150 via web too.

Analog Rig
VPI Classic II running with a Dynavector 20X2-H MC Phono Cartridge

Also
For living room and outside rear deck is connected to MX150 with (1)Parasound 5250 amp. Oppo 205 , Sony ES777, (1)PPP, and a DirectStream P15 Power Plant

Speaker system
Builder of custom very high end Dynaudio's 2 Main towers, 1 super tweeter Dynaudio built system above each tower, 4 surrounds all Dynaudio Esoteric drivers 6.5 mids, esoteric dome tweeters, 2 rear surrounds, and a custom 5 speaker 2 7" drivers, 2 3" domes, and a d21 tweeter in the center channel to compliment my 2 300lb custom subs and a JL F212

Misc Build Features
AC Power Electrical overview is 4 20 amp 120 circuits all 10-3 wiring extra shielding with walls custom modded with cross bracing 2x6s over a 14" thick concrete with R19 and weather barrier
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  #5  
Old 04-24-2017, 05:27 PM
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Masterlu Masterlu is online now
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Quote:
Originally Posted by djwhog View Post
Joe thanks, my 212 has some hum too, I have tried ground lifts and even a Furman outlet strip higher end unit and even all of that into my PS Audio conditioner, WW silver cable no help

I will order one of this asap and keep you and the thread posted.

PS Thanks so much, this will be a game changer.

My 212 even seems to add some noise when I use my MX150 but not when I am in pure 2ch mode on my C500 rig. For some reason my MX 150 even though on the same circuit as the C500 and both these even on a diff breaker and a diff PS Audio conditioner have given me fits. Sounds like your issues in similarity.

I did run another dedicated 120 circuit and another 20 amp breaker, got rid of light dimmers etc went all LED nothing and I mean nothing has helped.

When the audio system is off I power of the power to the 212 to keep it out of the loop and then even pull the power cord uggg....

Again Thanks Joe

WOW I sure hope this helps!

Can you tell me where to order at? Amazon 2-4 weeks I want it yesterday!
I stock them!
__________________
Ivan
FLORIDA
MX136, MC1.2KW(10) MC2KW(2), MCD1100, MS750(2) MVP881, C1000C/P/T, MPC1500, HT-2 SUBS(2) HT3F(2) WS350(2) XRT2K, XCS2K, XR27(2) XCS350(2) JL GOTHAM v2 SUBS(2) LUMAGEN RADIANCE SCALER, SONY VPH-G90U PROJECTOR, STEWART 120" MOTORIZED SCREEN, CINEMA-TECH SEATING, WIREWORLD PLATINUM CABLES
Reference System: ACCUPHASE A250 AMPS, C3850 PRE-AMP, DP950 CD/SACD TRANSPORT, DC950 DIGITAL PROCESSOR, DG-58 DIGITAL EQUALIZER, T1200 FM STEREO TUNER, PS1230 POWER SUPPLY, HRS-SXR CUSTOM RACK w/ M3X SHELVES, TAD REFERENCE ONE MK2 LOUDSPEAKERS, WIREWORLD PLATINUM CABLES
CAPE COD

MX150, MC501(2) MC1.2KW(10) MC2301(2) MR88, MVP881, MCD1100, MDA1000, C1000C/P/T, MPC1500, ESOTERIC K-01X 30th ANNIVERSARY (BLACK) SACD/CD PLAYER, G02-X CLOCK, HT3F(2) XRT2K, XCS2K, XR27(2) JL GOTHAM SUBS(2) JL FATHOM F113v2 SUBS(4) SOUND ANCHOR STANDS(2) KALEIDESCAPE STRATO & TERRA SERVERS, LUMAGEN RADIANCE SCALER, SONY VPH-G90U PROJECTOR, STEWART 120" SCREEN, SONUS FABER STRADIVARI, SILENZIO, FORTRESS SEATING, WIREWORLD PLATINUM CABLES
Analog Rig: CLEARAUDIO INNOVATION WOOD, UNIVERSAL ARM w/ Da VINCI' CART, 2nd UNIVERSAL ARM w/ GOLDFINGER STATEMENT CART, HRS-MXR REFERENCE RACK-GLOSS BLACK w/ M3X SHELVES, AESTHETIX RHEA SIG PHONO-PRE, WIREWORLD PLATINUM CABLES
Reference System: BURMESTER 911MK3 AMP(3), 088 PRE-AMP, 089 CD PLAYER, 100 PHONO PRE-AMP, 948 POWER CONDITIONER, AVID ACUTUS REFERENCE SP TT, GRAHAM PHANTOM II SUPREME ARM, BENZ MICRO LP-S CART, GRANDIOSO P1/D1 STACK, G01X RUBIDIUM MASTER CLOCK, N05 NETWORK PLAYER, SILENZIO, HRS-SXR CUSTOM RACK w/ M3X SHELVES, SONUS FABER AIDA SPEAKERS, JL FATHOM F113v2 SUBS(2) SOUND ANCHOR STANDS(2) WIREWORLD PLATINUM CABLES

Library System: GRANDIOSO M1 MONOBLOCK AMPS, C1 LINESTAGE PRE-AMP, K1 CD/SACD PLAYER, G1 MASTER RUBIDIUM CLOCK, E02 PHONO-PRE, SILENZIO, AERIAL ACOUSTICS 20T V2, AERIAL SW12 SUBS(2), CANTON REF K1’s, VPI HRX TT w/ SDS POWER SUPPLY, ORTOFON CADENZA BLACK CART, KLAUDIO RCM, SHUNYATA DENALI 6000/S v2, WIREWORLD PLATINUM CABLES
Bryston/Esoteric System: ESOTERIC C02-X PRE-AMP, P-02X TRANSPORT, D02-X DAC, G02-X CLOCK, BRYSTON 28B3 CUBED MONOBLOCK AMPS, SHUNYATA DENALI 6000/S v2(2) AMR-DP777-SE DAC, SILENZIO, TAD REFERENCE ONE MK2 LOUDSPEAKERS, QUADRASPIRE RACK, WIREWORLD PLATINUM CABLES
Accuphase/Canton System: ACCUPHASE E650 INTEGRATED, DP560 CD/SACD PLAYER, T1200 FM STEREO TUNER, PS530 POWER SUPPLY, CANTON REF K3’s, CANTON REF K5’s, SILENZIO, HRS MXR REFERENCE MAHOGHANY RACK w/ M3X2 SHELVES, WIREWORLD GOLD CABLES
Bryston Active System: BP26 PRE-AMP, MPS2 POWER SUPPLY, BAX-1 CROSSOVER, BDA-3 DAC, BDP-3 PLAYER, BCD-3 CD PLAYER, BIT15(2), MODEL T ACTIVE SPEAKERS, 21B3 CUBED AMPS, SILENZIO, TARGET RACK, WIREWORLD SILVER CABLES

Accuphase E-800 inbound...
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  #6  
Old 04-24-2017, 05:37 PM
Garytn Garytn is offline
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That's a great find and great that it has worked. I'm considering a JL sub. Is this hum a common issue?
__________________
Amplification:
Audio Research GS150
Audio Research GSPre
Speakers:
Wilson Sasha 1
Digital Sources:
Ayre QX-5 Music Hub/ DAC
Ayre CX-7-E mp CD player
SGC sonicTransporter
Turntable:
Brinkmann Bardo
12” Brinkmann arm w/ Lyra Delos
Cables:
Cardas Clear
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  #7  
Old 04-24-2017, 05:39 PM
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Masterlu Masterlu is online now
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Quote:
Originally Posted by Garytn View Post
That's a great find and great that it has worked. I'm considering a JL sub. Is this hum a common issue?
Not at all; I have about 10 pairs of subs, zero hum.
__________________
Ivan
FLORIDA
MX136, MC1.2KW(10) MC2KW(2), MCD1100, MS750(2) MVP881, C1000C/P/T, MPC1500, HT-2 SUBS(2) HT3F(2) WS350(2) XRT2K, XCS2K, XR27(2) XCS350(2) JL GOTHAM v2 SUBS(2) LUMAGEN RADIANCE SCALER, SONY VPH-G90U PROJECTOR, STEWART 120" MOTORIZED SCREEN, CINEMA-TECH SEATING, WIREWORLD PLATINUM CABLES
Reference System: ACCUPHASE A250 AMPS, C3850 PRE-AMP, DP950 CD/SACD TRANSPORT, DC950 DIGITAL PROCESSOR, DG-58 DIGITAL EQUALIZER, T1200 FM STEREO TUNER, PS1230 POWER SUPPLY, HRS-SXR CUSTOM RACK w/ M3X SHELVES, TAD REFERENCE ONE MK2 LOUDSPEAKERS, WIREWORLD PLATINUM CABLES
CAPE COD

MX150, MC501(2) MC1.2KW(10) MC2301(2) MR88, MVP881, MCD1100, MDA1000, C1000C/P/T, MPC1500, ESOTERIC K-01X 30th ANNIVERSARY (BLACK) SACD/CD PLAYER, G02-X CLOCK, HT3F(2) XRT2K, XCS2K, XR27(2) JL GOTHAM SUBS(2) JL FATHOM F113v2 SUBS(4) SOUND ANCHOR STANDS(2) KALEIDESCAPE STRATO & TERRA SERVERS, LUMAGEN RADIANCE SCALER, SONY VPH-G90U PROJECTOR, STEWART 120" SCREEN, SONUS FABER STRADIVARI, SILENZIO, FORTRESS SEATING, WIREWORLD PLATINUM CABLES
Analog Rig: CLEARAUDIO INNOVATION WOOD, UNIVERSAL ARM w/ Da VINCI' CART, 2nd UNIVERSAL ARM w/ GOLDFINGER STATEMENT CART, HRS-MXR REFERENCE RACK-GLOSS BLACK w/ M3X SHELVES, AESTHETIX RHEA SIG PHONO-PRE, WIREWORLD PLATINUM CABLES
Reference System: BURMESTER 911MK3 AMP(3), 088 PRE-AMP, 089 CD PLAYER, 100 PHONO PRE-AMP, 948 POWER CONDITIONER, AVID ACUTUS REFERENCE SP TT, GRAHAM PHANTOM II SUPREME ARM, BENZ MICRO LP-S CART, GRANDIOSO P1/D1 STACK, G01X RUBIDIUM MASTER CLOCK, N05 NETWORK PLAYER, SILENZIO, HRS-SXR CUSTOM RACK w/ M3X SHELVES, SONUS FABER AIDA SPEAKERS, JL FATHOM F113v2 SUBS(2) SOUND ANCHOR STANDS(2) WIREWORLD PLATINUM CABLES

Library System: GRANDIOSO M1 MONOBLOCK AMPS, C1 LINESTAGE PRE-AMP, K1 CD/SACD PLAYER, G1 MASTER RUBIDIUM CLOCK, E02 PHONO-PRE, SILENZIO, AERIAL ACOUSTICS 20T V2, AERIAL SW12 SUBS(2), CANTON REF K1’s, VPI HRX TT w/ SDS POWER SUPPLY, ORTOFON CADENZA BLACK CART, KLAUDIO RCM, SHUNYATA DENALI 6000/S v2, WIREWORLD PLATINUM CABLES
Bryston/Esoteric System: ESOTERIC C02-X PRE-AMP, P-02X TRANSPORT, D02-X DAC, G02-X CLOCK, BRYSTON 28B3 CUBED MONOBLOCK AMPS, SHUNYATA DENALI 6000/S v2(2) AMR-DP777-SE DAC, SILENZIO, TAD REFERENCE ONE MK2 LOUDSPEAKERS, QUADRASPIRE RACK, WIREWORLD PLATINUM CABLES
Accuphase/Canton System: ACCUPHASE E650 INTEGRATED, DP560 CD/SACD PLAYER, T1200 FM STEREO TUNER, PS530 POWER SUPPLY, CANTON REF K3’s, CANTON REF K5’s, SILENZIO, HRS MXR REFERENCE MAHOGHANY RACK w/ M3X2 SHELVES, WIREWORLD GOLD CABLES
Bryston Active System: BP26 PRE-AMP, MPS2 POWER SUPPLY, BAX-1 CROSSOVER, BDA-3 DAC, BDP-3 PLAYER, BCD-3 CD PLAYER, BIT15(2), MODEL T ACTIVE SPEAKERS, 21B3 CUBED AMPS, SILENZIO, TARGET RACK, WIREWORLD SILVER CABLES

Accuphase E-800 inbound...
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  #8  
Old 04-24-2017, 05:50 PM
Garytn Garytn is offline
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Join Date: Nov 2016
Location: Knoxville TN
Posts: 206
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Good! Thanks.
__________________
Amplification:
Audio Research GS150
Audio Research GSPre
Speakers:
Wilson Sasha 1
Digital Sources:
Ayre QX-5 Music Hub/ DAC
Ayre CX-7-E mp CD player
SGC sonicTransporter
Turntable:
Brinkmann Bardo
12” Brinkmann arm w/ Lyra Delos
Cables:
Cardas Clear
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  #9  
Old 04-24-2017, 06:51 PM
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djwhog djwhog is offline
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Join Date: Mar 2011
Posts: 6,955
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Ivan wish I knew this I would have ordered direct from you Sorry... I ordered from company direct
__________________
Dave's Cave main Basement system
C500C C500T preamp and a MX150 control center, (3)McIntosh 601 mono block amps, (1)7270 McIntosh amp driving rears in 7.1 (1)Halo A23 amp for side surround, & (1)452 McIntosh amp for main towers part of a bi-amp setup with 601's, Esoteric K-03 JL F212 sub all glued together with mostly all WireWorld & Moon Audio Black Dragon cables.

Headphone Rig
Audeze LCD-X Sennheiser hd 800 & Sennheiser hd 700 cans, Woo Audio WA-6SE with Sophia Princess & matched pair of 6GL7/6EM tubes Black Dragon Cable upgrades on the HD700s!

Streaming Dac Gear
includes K03, high-end custom built Toshiba core i7 16 gigs Wireworld Platinum USB cable, Ipad mini & Itouch driving media center 20 for full remote control anywhere on property and even via web to have music on when I get home Also can remote control MX150 via web too.

Analog Rig
VPI Classic II running with a Dynavector 20X2-H MC Phono Cartridge

Also
For living room and outside rear deck is connected to MX150 with (1)Parasound 5250 amp. Oppo 205 , Sony ES777, (1)PPP, and a DirectStream P15 Power Plant

Speaker system
Builder of custom very high end Dynaudio's 2 Main towers, 1 super tweeter Dynaudio built system above each tower, 4 surrounds all Dynaudio Esoteric drivers 6.5 mids, esoteric dome tweeters, 2 rear surrounds, and a custom 5 speaker 2 7" drivers, 2 3" domes, and a d21 tweeter in the center channel to compliment my 2 300lb custom subs and a JL F212

Misc Build Features
AC Power Electrical overview is 4 20 amp 120 circuits all 10-3 wiring extra shielding with walls custom modded with cross bracing 2x6s over a 14" thick concrete with R19 and weather barrier
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  #10  
Old 05-17-2017, 04:45 PM
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Mike-48 Mike-48 is offline
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I had the same problem several years ago. Either the Emotiva wasn't available yet or I just didn't know about it. Audio by Van Alstine sells the "HumDinger," which removes DC from the line, and it did the trick at $125 per sub (a little more now, I think).
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Desktop system: JRiver Media Center, Classé CP-800, Marsh A400S, Harbeth P3ESR, B&W ASW610 (sub)
Main system: Synology NAS, Auralic Aries G1, Anthem STR DAC-preamp, Bryston 4B3, Janszen Valentina, 2xJL F112; acoustics by ASC, GIK, RPG, & Vicoustic
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