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  1. #1

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    Default new crossover needed

    I have a pair of Boston Acoustics CR7's that have fried crossovers. I got new tweeters from BA and the woofers are still good but I need new crossovers to get them to work. I want to do this on the cheap if possible. It was about a 3" by 4" crossover board that connected to the binding posts on the back, the 6.5" driver and the tweeter.

    I have no Idea where to find a pair of these that have the same crossover point 2800Hz and are plug and play because I don't know how to solder or do any electronics work.
    HT Setup: Onkyo 706; Lsi9's; Csi A6; Fxi3's eD A2-300

    2 CH: Squeezebox Touch; Dared SL-2000a; Lsi9's; Carver M1.5T; Velodyne DLS-3750R; Music Hall DAC 25.2

  2. #2

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    I can build you a custom XO if you send me the bad one.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  3. #3

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    did you try to get them from BA? There are a few of us who could rebuild them for you if need be, or even walk you through it.
    Speakers:SDA2a, sub:Atlantic Technologies 172 PBM
    Pre:B&K PRO-10MC(2ch)
    Amps:Parasound HCA 1000a
    SourcesOppo DV-970HD, Xbox360, Kenwood KT-5300
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    Life's short, Listen to SDA's
    Life is short live Sui Juris
    Where did SOPA go?

  4. #4

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    Default

    I will post pictures of these tonight or tomorrow so hopefully someone can diagnose what is wrong and how to go about fixing it. The problem is the same on both boards. There is a white rectangular block that got very hot, melted through the board and broke in half. Could it be a simple as replacing that one piece on the crossover and it will work again? When I had them hooked up both tweeters didn't work but the bass drivers worked just fine. I would love to get these working soon, I think they are pretty good speakers.
    HT Setup: Onkyo 706; Lsi9's; Csi A6; Fxi3's eD A2-300

    2 CH: Squeezebox Touch; Dared SL-2000a; Lsi9's; Carver M1.5T; Velodyne DLS-3750R; Music Hall DAC 25.2

  5. #5

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    IF you don't go for the repair option, I think that "Marvin" guy on eBay sells Some of those xovers. Your's should have a part # to compare. Just search for Polk speakers, they sually have MANY sets up for sale. As I seem to remember, they sell Polk Speakers sets with Boston Xovers, on some of the sets.

    Regarding last post, that "white block thingy" is a resister, which should be replaceable, if it didn't take anything else out when it went. The wiring diagram should show you what value you need, or you can get BA customer service to tell you, or just pull out the other one.

  6. #6

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    I have a pair of Boston Acoustics CR7's that have fried crossovers. I got new tweeters from BA and the woofers are still good but I need new crossovers to get them to work. I want to do this on the cheap if possible. It was about a 3" by 4" crossover board that connected to the binding posts on the back, the 6.5" driver and the tweeter.

    I have no Idea where to find a pair of these that have the same crossover point 2800Hz and are plug and play because I don't know how to solder or do any electronics work.

  7. #7

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    ^^reported
    HT Rig
    Receiver- Onkyo TX-SR806
    Mains- Polk Audio Monitor 70
    Center- Polk Audio CS2
    Surrounds- Polk Audio TSi 500's :D
    Sub- Polk Audio PSW125
    Retired- Polk Audio Monitor 40's
    T.V.- 60" Sony SXRD KDS-60A2000 LCoS
    Blu-Ray- 80 GB PS3


    2 CH rig (in progress)
    Polk Audio Monitor 10A's

    It's not that I'm insensitive, I just don't care.. :D

  8. #8

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    I found this on ebay. It looks like it would be perfect for my speakers. The only difference is that the crossover is set at 2700 Hz where the original one was 2800 Hz. I don't think that it will be an issue because they are so close.

    Looking at the picture provided. It has 4 leads coming off of it, 2 go to the tweeter and 2 go to the 6.5" midrange. Do the inputs from the binding posts go to the bottom of the board where it has IN+ and IN-? If so what would I use to wire them from the binding posts?

    Crossovers from ebay

    http://cgi.ebay.com/Boston-Acoustics...item4cec677660
    HT Setup: Onkyo 706; Lsi9's; Csi A6; Fxi3's eD A2-300

    2 CH: Squeezebox Touch; Dared SL-2000a; Lsi9's; Carver M1.5T; Velodyne DLS-3750R; Music Hall DAC 25.2

  9. #9

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    The cross-over you are showing should work just fine ,It not that hard to hook it up ,it should come with a diagram.But them speakers are just rated at a 100watts and your amps put out that much ,probally more then the 100watts rated.You would probally be better served to get a newer pair of speakers that can handle more power.Newegg.com has the Klipsch Synergy B-3 for $199 a pair and the polk Audio has some good prices on thier monitor series speakers and they sound good for the price ,they sound better IMO then speakers costing 2 to 5 times as much.If you are looking for book shelf speaker then the Monitor 40's for $129 a pair is hard to beat and they handle up to 125 watts a piece,or the Klipsch Synergy B-3 for $199 a pair and they are rated at 85watts and 380watts peak.The polk will have better bass and to me they are just cleaner sounding,the Klipsch Synergy B-3 sound good but to me they are over bright and the bass is not as low .IMO.
    Last edited by john E; 12-21-2009 at 11:42 PM.
    ONKYO TX-SR607
    PolkAudio Speakers
    Front-Monitor 70's
    Center-CS2
    Sur-round-Monitor 40's
    Sur-round Back-Monitor 60's
    Subwoofer-PSW-505
    Back fill in Bass PSW-10
    LG 50"Black 1080P Plasma HDTV (50PS60)
    LG Blu-Ray Disc BD390

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