Removing infrasonic filters from Rane AC23 Crossover

Hi,
I have a Rane AC23 active stereo crossover, that I bought a while ago and now want to use it for a current fullrange build.
There are just two things about it, that I don't like:
The first thing is that the delay circuits are for the low- and mid-outputs. I'd rather like to have delay circuits for the high- and mid-outputs, but i think that can't be changed easily, so I have to live with it.

The second thing, I think, can be changed: I'd like to remove the two fixed infra(sub)-sonic filters (3rd order butterworth filters @ 20hz), because I don't need them for my subs and they just rob me of precious low end extension. ;)

Unfortunately I'm a noob at crossover-building/modifying and I can only guess which parts to remove.

Could someone be so kind to tell me which parts on the board are the infrasonic filters so I can unsolder it without destroying my crossover?

Here are some pics:
https://lh3.googleusercontent.com/7...bfEr2qHgIG0wzTHExnbC_yJDhQemenI=w1224-h943-no

GWLRrTYiP2o5G10bMMqgGOOhDhctgkSI_OzLazX0He0rsbbwwaSF9StFhH7sbld8fa2qb9dz_RLiylSfyV8y9fis2WVst3uPaSjfU9ff2BU8owTAPlNs9FVXLIc4Bphgv63fHAMPw0-LjzLa-C4BDDGDZUGQfKBQQouzDeys4tG5PuqlEmsFGDVoqykZikBtH92L9ueeybskJv4q3xRfBXfUBiv2UFyJh23rGgBmkaO3oSXnumD-dSV5d5idW3f3NQXd2sJ5Z1ppQ8dXdfDDm4foHtDYxo114elbKypSmRMNmqjI-7eWifrBhivAYBX4YUMh7xmDkvjpeBBswKOowYsPpBuA2B0VygfiveyO0NAaezyLaQVI4VV3wAosdONzwB08N2pmpTWj3idL3TPgAkzWv8kzFWeHoSSEdjyuZYrajVbcFMNmONZoH_zvrG-08h-pR8MTgNj9oALnYmhAYWjS10i7kYU-QY43KZfy7DJW2_zqulYhmSa3XY62lngtpC_HWuZK7K2xBqYg2Mo8mdDRSImpTomrWQp_X1kOcnH6CoApV4hOp2c9u4RgGpgEHVkWeXTWEx75Nbce5K7187Mw3GW2N29yr_lMNm03J62R7UA3Z4doXqd6JeA3xVICte_ICmgYJfmOcr85Qhe6Bit4w3H8CfgjOAC0aNWKaS_LtFgyOL8YLcA=w2494-h944-no


TjuPsbnJrOaLXMwPnYGqBVqsVI1oXUp5uzXxAsSJJJrjLZdTQUDfQE2CCEsc4ombiJ_Pjqie9PsbAPEGeZo0BON6NNitlZQHtv-_HMSQPqg2Au4WCjG3bjdmQ9cFdrwFMxSfm1JFU2FHY9ZYNa1ZvrcW6rsOgCMOHlJgNlooZekpzHAAR9zeK_JIp6H5frYV_Day0LOJq3aZ4dQ9j_t27uzwiG-yCOriikIsKlsslMrRZTclt3-cMJ-8yxPYe6-Y5T9oRAVtbpEOyLVLvOmdrjJHGRY2A_1Pue19iTME6HqkY0pIA6TPSnZH4VmM-u5Xd-OCV-2X7cfYV-5mmwTb0iA1oJd7WVUB0m8rLCthR3K23cQnWWoj-upEOLCcywebKXWaUN-DCKobPSHil3fd-uTUtY664BA_xi5Rz_vh7HCbULr0xVW_SHKZfJ0_bo5Vx28YkEU6EBdbEmERYpCQEmwhhn-2c1fZ3Wy-hl2vYDqvGn2vK6S85iQtVhKuRRKdYwClcLWI3YrSB-8PMFbidjmVXh_4tPerx5GCCnjEzjQ7pqPwy-wENaWHmdQlbBDHTW-0pXaINBDfl8r1s_1Df7GoLyG_QvXv_Xn-71z6GnXOwAZlcV7vrAHr5oSeWerac6M58AxR62j0S9NIKSep__3_vLWwlESc5c7y0sX3FBjNfGwxqWgP6TTXOXsJ5UqxISgs22Qy_cY3A6uyGuqq_Y3IW4DxGjNx7qtg2eCJSVjRSuTP=w1258-h943-no


jivBzb6eejczPyH0rcWBQGstRe75VV9FwNMn4XUEgwUoqlszewRKqpNJw9iuifAjsseWHL65OHsHq8kEHPyrUncyYvXL6vchNfq-yKUO2_tUV1Z2QpHdV7dJOpno_NoAaJvCtKrp9ZLX9LPWQG6eUZBlG9u8TPHQfWaBILcCowvYUvP5ePlN2NVjYmH1y6Nw_Xl2Cl44gCtLV4D3_tQmWSEO70xIVFxc-_aL3Vuf90P8K8pEaQpUWwRbcHLc5yKSEaWfXgRvoqJm23j8N_V9UyBaE6exC_JZUwnS4DCd68bg2oXzWl_hzIoe3mmqVQ1x3907eMC6pX-Z7-V9eV_QKoDAGFbRKUG2WpSZQyc_vFqDDOx1xCLPhInluolb5AwGCQphZevRTyNSxE_JP-1xmY-KwyCXaBIZefVfzVXREEY1YAsFWxxO_SuwfKHovhBx1sAcssOKLImEDIINbYBh-J3-5e25Tp_An9t-O6G-M6ZcTZ7tZMh9dYW51SSp7kCe_F4DwMcwBrnQ_G3npNNXtrM5FDkeMX_MDsma8BEvvEey-9SDGREexc3lte84u8NFHNqQGnwY-gF0ctRR9sy8tqRQPzKxOJ2126pCez-5j8SU6c_FoRXJd6ogc1AntIFfffqQ-qah4s1Mxoxms7V6qtjnyYnsSpWuiSIfNi_7F1WfCfC75G9wzO9RVgEJxHQ1afhpXtljfEQITTl5M08X_Vx1ILOGjkYgzBOkJUGksz4P4LJK=w1258-h943-no
 
Isn't this a shematic? (For some reason this picture is just a link in my first post)
[IMGDEAD]https://lh3.googleusercontent.com/v8yRJgMIpI7D6fnhrmEpwWQRSLQn4CPpDsKJYGGmLacMscZaqiUBLNlvL8UjJmVYhL3eK7TwIB5zcUuka0a1txTGjzpzQE-bOfVTeSs9oQV5i0_0T7L0kLSprBjDY_Hup9795ne0fp8uwvHEhnaXBaYJLZyauxBKuoGSIcWW6wskpbPhptXp4KPHqfztLFRBYLD2e7wtpeULgSR4tIuglAFY_MvGCaqHaUBDXN1bwP9HF-aVW7emWl4y0WXweiIUc5hb5IGn2B2cZkXZ6bgFIAApyvHrmPk1SpgwANXEWMyip58oSwjqsnV8_U9F3y14zqLhiHoJTFW5xGSQ18_64JfSn6BmZ1M-sz8SVPyeEMM61U50ys34yZeIyRImduV8nWgnMkhpLJw9dClYRP5IQCzzwtQBAijsbl1j2ylkUFgadN2Tw3WSh3B2umZ2bUewKSjhX9kZbZgAe1f7Xb8cT4xRCjBuugFuCOGf1YJQj4ZJg2W9FZrzrbi98hkOig457a1odK0opAgD1As06Z-tTryxG5U3CFz7X-l4lMDtBO0Oa-ac2jYcIK_CJlU0H4ix60MFv8QdkUWx6_idyIEXskGmdP-viYso9WyuPRGeI8W4fKiWNHLn9wgButirnJitzhXgzVJpiYv8qrxCDvlGJ5O6dxTDP_IWDkIe2FrAm1NFgFR5ReGIoP4=w1224-h943-no[/IMGDEAD]
 
Last edited:

eriksquires

Member
2013-05-10 4:11 pm
I'd like to point out a couple of things.


This sort of project is worthwhile only as a learning exercise. Maybe you are better off learning to make your own from scratch? Op amp filters can be a lot of fun. I bet that after 2-3 weekends of breadboarding an NE5532 based crossover you'd learn what you needed. :)





Next, you can do all you want in a miniDSP type of crossover.