Polk 7A Crossover Re-Build
Cfidave
Posts: 5
Just acquired a nice pair of Polk 7A's, with Peerless tweeters. They didn't sound as expected, so I took a look at the crossovers. One crossover had both resistors falling apart, and way out of spec. The other had the 34uf cap disconnected from a broken lead and one resistor falling apart, Re-built with Sonicaps for the tweeter & Solens for low frequencies, Mills resistors. They sound very, very nice. Imaging and clarity is only second to my Rogers LS7's. Bass is solid and soundstage is bigger then the Rogers. Also have original large Advents, which the Polks blow away. Powered with a re-built Dynaco ST70 tube amp, Perreaux pre amp. Great little speaker, crossover upgrade is well worth the time and expense. Pics attached:
Amps: Dynaco ST 70 (rebuilt), Hafler DH-200, Preamps: Perreaux SX1, Akitica PR 101, CD Players: Onkyo RDS 511, Teac RW 900 MKII, Sony SACD S9000ES, Turntable: Pioneer PL630, Sony 5520 Speakers: Ohm Walsh 4's, Large Advents, Rogers LS7's, POLK Monitor 7A's.
Comments
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Nice job and welcome to the forum.Speakers: Polk SDA-SRS xovers rebuilt by David, RDO194's, Dynamat, BH5, glued magnets, new cloth, custom aluminum terminal plates with Cardas posts and Speakon interconnect
Speaker Cables, Jumpers & Interconnect: DIY Douglas Connection
Power Amp: Sunfire Architect's Choice Series II
Preamp: Adcom GFP-750
SACD/CD: Oppo BDP-95
Tuner: Sansui TU-717
TT: Technics SL-MA1
Phono Pre: Emotiva XPS-1
Music Server: Mac Mini w/JRiver - iPad w/JRemote
DAC: Eastern Electric MiniMax Plus
Other Polks: SDA: 1A, 1C, 2B, CRS+ / Monitor: 10A, 5jr, 4 / RT5 -
Thanks much, you guys are a great source of informationAmps: Dynaco ST 70 (rebuilt), Hafler DH-200, Preamps: Perreaux SX1, Akitica PR 101, CD Players: Onkyo RDS 511, Teac RW 900 MKII, Sony SACD S9000ES, Turntable: Pioneer PL630, Sony 5520 Speakers: Ohm Walsh 4's, Large Advents, Rogers LS7's, POLK Monitor 7A's.
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Welcome to club polk. Let us know how the sound changes after 200-300 hours of burn in. Enjoy your new toys.
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Grreat job. I have to get around to doing mine...
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Nice job on some fantastic speakers!
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how did you secure the caps to the crossover board. i am getting ready to recap my 10's. this will be my first go around and need all the help i can get
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how did you secure the caps to the crossover board. i am getting ready to recap my 10's. this will be my first go around and need all the help i can get
3M VHB Tape. You can buy a small roll at any good hardware store, or Home Depot/Lowes.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/
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