Polk SDA AMP COMPATIBILITY
beru
Posts: 20
Hello all. Newbie here.
question: i am looking at a pair of Polk SDA . I have two Sony TA-55ES amps.
Will they be able to power the Polks? What SDA `s would you recommend to get? listen to a lot of blues, classic and some old rockanroll.
Thank you. Regards.
question: i am looking at a pair of Polk SDA . I have two Sony TA-55ES amps.
Will they be able to power the Polks? What SDA `s would you recommend to get? listen to a lot of blues, classic and some old rockanroll.
Thank you. Regards.
Post edited by [Deleted User] on
Answers
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SDR? You mean SDA?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/ -
Sorry meant SDA
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Do you know what model SDA's they are? Pictures may help identify them.
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speakers I am looking at are SDA 1.2 TL , USED.
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The Sony will drive it, but don't expect to shake the walls. Low to moderate levels only. 150 watts @ 4 ohms. Bi-Amping would help using both, but again, nothing earth shaking.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/ -
I have two amps and they each will power a speaker
It says on the manual up to three hundred watts in mono
Thoughts? -
300 watts @ 8 ohms bridged, not going to work with SDAs.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/ -
So what amps do you suggest! I am not a rich guy and I like vintage hear?
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speakers I am looking at are SDA 1.2 TL
It will if he uses an isolation transformer such as a Dreadnought.westmassguy wrote: »300 watts @ 8 ohms bridged, not going to work with SDAs.
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Since I am a newbie , could someone explain what is a Dreadnought, what does it do and why do I need it?
Thank you -
Also what is so special about those speakers? That they need special gear?
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Because of the interconnect cable that allows the SDA drivers to work they need a common ground amplifier. You can't use monoblocks or bridged amps without dreadnought.afterburnt wrote: »They didn't speak a word of English, they were from South Carolina.
Village Idiot of Club Polk -
2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures
Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
Gear on standby: Melody 101 tube pre, Unison Research Simply Italy Integrated
Gone to new homes: (Matt Polk's)Threshold Stasis SA12e monoblocks, Pass XA30.5 amp, Usher MD2 speakers, Dynaudio C4 platinum speakers, Modwright LS100 (voltz), Simaudio 780D DAC
erat interfectorem cesar et **** dictatorem dicere a -
what is the principle then behind the interconnect cable?
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or what /why do those speakers need an interconnect? just learning a lot and loving that!
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The difference in sound between the left and right channels gets played on the opposite channel dimensional drivers, the interconnect cable is how this works. It works to prevent interaural crosstalk. There used to be a white paper but the link apparently no longer works. There are a lot of threads though, with some searching.
http://forum.polkaudio.com/discussion/19142/what-is-sda
http://forum.polkaudio.com/discussion/48162/how-does-sda-workafterburnt wrote: »They didn't speak a word of English, they were from South Carolina.
Village Idiot of Club Polk -
"S"tereo "D"imensional "A"rray is what made Polk famous
http://www.polksda.com/
http://vr3mods.com/uploads/SDA_Handbook_2011_Rev2.pdf
2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures
Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
Gear on standby: Melody 101 tube pre, Unison Research Simply Italy Integrated
Gone to new homes: (Matt Polk's)Threshold Stasis SA12e monoblocks, Pass XA30.5 amp, Usher MD2 speakers, Dynaudio C4 platinum speakers, Modwright LS100 (voltz), Simaudio 780D DAC
erat interfectorem cesar et **** dictatorem dicere a -
Nightfall
cool picture by the way!
So if I get an interconnect, then I need a very powerful amp to drive these.
Would a Yamaha m-80 work: 250 Watts per channel? -
If you get one? They are selling the 1.2TL's without the interconnect cable?afterburnt wrote: »They didn't speak a word of English, they were from South Carolina.
Village Idiot of Club Polk -
yes it is at a pawn shop. they are in ok shape. I can redo/fix the box/have a wood shop in my garage, and upgrade the crossover and such. But no interconnect.
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I have a yamaha M-80 being worked on at the Legendary Amps store. .
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You can make an interconnect cable. Listening to SDA's without the interconnect cable is like cereal without milk.
Are any of the midwoofers frozen or scratchy? No tweeters blown? How much are they asking?afterburnt wrote: »They didn't speak a word of English, they were from South Carolina.
Village Idiot of Club Polk -
two tweeters blown, all other speakers seem fine. they want 300 as is. Cabinets are in need of TC.
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That's a smoking deal if two tweeters and some woodwork is all that is really wrong with them. Might even offer $250, it is a pawnshop after all. To replace all the tweeters will be $400, which still puts you well under their value.afterburnt wrote: »They didn't speak a word of English, they were from South Carolina.
Village Idiot of Club Polk -
Yes
So the Yamaha would be good to power these? -
I have a Yammy M-80 powering the smaller SDA1C's, but I see no reason why it couldn't drive the big 1.2TL's. Rated @ 290Watts into 6ohms/330 into a 4ohm load. I had Skip go through my M80 as well. He does great work!2.3TL's - Living Room
CRS+'s (4.1 TL's) - Office
SDA1C's - Famdamly Rm
SDA1C's - Master Bedroom -
The Dreadnaught isn't the issue, the rating of the amplifier is. The 1.2TLs are 6 ohm nominal, and drop below 4 ohms or less at certain frequencies. I could be wrong, but I've never seen a bridged amp with a 4 ohm rating. In fact they usually have a warning about using the amp in bridged mode with speakers rated less than 8 ohms.speakers I am looking at are SDA 1.2 TL
It will if he uses an isolation transformer such as a Dreadnought.westmassguy wrote: »300 watts @ 8 ohms bridged, not going to work with SDAs.
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/ -
Depends on the amp, volume level. room size, etc. You are partially correct. Many stereo amps when bridged are not tolerant of loads greater than 8 ohms (numerically lower impedance)westmassguy wrote: »
The Dreadnaught isn't the issue, the rating of the amplifier is. The 1.2TLs are 6 ohm nominal, and drop below 4 ohms or less at certain frequencies. I could be wrong, but I've never seen a bridged amp with a 4 ohm rating. In fact they usually have a warning about using the amp in bridged mode with speakers rated less than 8 ohms.speakers I am looking at are SDA 1.2 TL
It will if he uses an isolation transformer such as a Dreadnought.westmassguy wrote: »300 watts @ 8 ohms bridged, not going to work with SDAs.
Other bridged amps will drive a four- or lower-ohm load with ease.
Adcom GFA-555 and '555 II will drive a 4-ohm load when bridged. I think Adcom suggests using the "Fan Kit" for 4-ohm bridged operation.
Aragon Palladium is a factory-bridged amp that will put nearly 1000 watts into a 2-ohm load. The current-production equivalent, the Iridium, will also drive a 4 ohm load (perhaps less.)
Spread-Spectrum Technologies "Ampzilla 2000" is a factory-bridged amp rated for 8 and 4 ohm use, that is "stable below 1 ohm".
What the Sony TA-55ES amps will deliver into a nominal 6-ohm load I can't say. The owner's manual may have that info. -
I downloaded the owners manual. It has 12, 8, 6, and 4 ohm rating for 2 channel, but only an 8 ohm rating for bridged operation. They do list "Dynamic Power" for 8, 6 and 4 ohms while bridged, but not continuous. Since the 1.2s are already @ 6 ohms to start, I would not operate them with the Sony'sHome 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/ -
My two cents, just get the speakers you can find an amp anytime, it's a deal!POLK SDA 2.3 TLS BOUGHT NEW IN 1990, Gimpod/Sonic Caps/Mills RDO-198
POLK CSI-A6 POLK MONITOR 70'S ONKYO TX NR-808 SONY CDP-333ES
PIONEER PL-510A SONY BDP S5100
POLK SDA 1C BOUGHT USED 2011,Gimpod/Sonic Caps/Mills RDO-194
ONKYO HT RC-360 SONY BDP S590 TECHNICS SL BD-1
