A friend just gave me (gratis) a pair of SDA1's :-)
Threshold400A
Posts: 2
Newbie here. A friend (original owner) just gave me (gratis) a pair of SDA1's :-) They have the vertical tweeters. They are oiled walnut tops and bottoms and black cloth on the front and sides. I have not yet hooked them up to my Threshold 400A so want to ask about the so-called 'frozen' magnet issue. How can I determine whether these units suffer from any 'frozen' magnet issues. I do not want to try to drive the speakers if any of the magnets are damaged and if doing so will damage the woofers or systems. Also, if I need to purchase any new woofer drivers what is the contact point at Polk (Tel #?) Thanks !
Best Answer
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Push on your mid-woofer cones gently and see if they push in and come back.
If they do that, you're good till you glue them down later.
Do you have the connecting cable ?
Your Threshold Amp. . I don't know if it's common ground or not. Others will chime in to let you know about that issue.Most people just listen to music and watch movies. I EXPERIENCE them.
Answers
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Thanks, Tony. I do have the blade/pin cable
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Maybe it's discussed deep down in this link. I got tired of looking at a lot of reviews and comments after a while. Don't hook that amp up until you get the common ground issue answered.
https://forum.audiogon.com/discussions/review-threshold-400a-amplifierMost people just listen to music and watch movies. I EXPERIENCE them. -
Maybe it's discussed deep down in this link. I got tired of looking at a lot of reviews and comments after a while. Don't hook that amp up until you get the common ground issue answered.
https://forum.audiogon.com/discussions/review-threshold-400a-amplifier
If the drivers are good/not frozen and the amps common ground issue hasn't been answered don't hook up the interconnect/SDA cable. You can safely use a non-common ground amplifier as long as that cable isn't connected. The speakers will just lack the SDA effect."Make a man a fire and he'll be warm for a day. Light
a man on fire and he'll be warm for the rest of his life." -
Nice friend!! Congrats!VA HT HK AVR20II, Sony S9000ES CD/DVD/SACD, Polk Audio RC80i / Polk Audio CSi3, 60" Panasonic Plasma, Nordost / Signal Cable A2 / Wireworld / Pangea / Magic Power
VA 2 Channel Focal Electra 926 speakers, Pass Labs X150.5 Amp, Eastern Electric MiniMax Preamp (Tutay mods), Eastern Electric Minimax CDP (Scott Nixon mods), Music Hall mmf 5.1 Turntable, Parks Audio Budgie Phono Pre , Audioengine B1 streamer, MIT S3 IC's / MIT Shotgun S3 Speaker Cables / PS Audio power cables
Noggin Schiit Valhalla, Pangea, Phillips Fidelio X1, Polk UF8000
Polk SDA1c modded
Polk CRS+ 4.1TL modded (need veneer)
Polk SDA2BTL (fully modded)
A/L 1000VA Dreadnought Canare 4s11 SDA cable
SACD Marantz DV8300
Sony S9000ES CD/DVD/SACD
Yamaha YP-D6
Soundcraftsmen PCR800
Audible Illusions L1 Preamp
Vincent MFA based Cocci Tube Preamp
Pho-700 Phono Pre
Signal Cable Silver Resolution IC's -
Of interest:
http://www.diyaudio.com/forums/solid-state/284607-threshold-400a-bias-issue.html
Of more interest (see post 10): Nelson Pass himself says the 400A *is* a common ground amp:
http://www.diyaudio.com/forums/pass-labs/285958-threshold-400a-bias-issue-yes.htmlJay
SDA 2BTL * Musical Fidelity A5cr amp * Oppo BDP-93 * Modded Adcom GDA-600 DAC * Rythmik F8 (x2)
Micro Seiki DQ-50 * Hagerman Cornet 2 Phono * A hodgepodge of cabling * Belkin PF60
Preamp rotation: Krell KSL (SCompRacer recapped) * Manley Shrimp * PS Audio 5.0 -
@agfrost, Great Links! That was some great reading on a Threshold 400a amp and some insight by the man, NELSON PASS, himself.
Common Ground amp, for sure.Most people just listen to music and watch movies. I EXPERIENCE them.
