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Post by aceinc on Dec 15, 2022 7:55:45 GMT -5
I have a pair of XPA-1s, and I want to put a high pass filter on the input so that I can send everything but the "sub" signal through the XPA-1s. To design the high pass filter I need the input impedance. In reading the specs (online) it appears the input impedance is 47 K. I am unclear if this is for the unbalanced or balanced connections. Someone suggested that if the impedance is 47 K for the unbalanced connection the balanced would be 94 K. Based on this I should use design based on 47 K per "differential leg" of the XLR connector. My knowledge of electronics is limited, so I would appreciate help in providing the correct information so I can design this properly. If antone has done this, help in the design is welcome as well. Here is a link to the page which shows how to design the filter I want, I am looking to have a 3db point of about 70 hz. www.troelsgravesen.dk/High-Pass-Filter.htm |
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Post by bitsandbytes on Dec 15, 2022 10:57:23 GMT -5
According to my Emotiva XPA owner's manual (first generation), on page 31, the XPA-1 gen 1 has the following input impedances: Unbalanced - 20kohms Balanced - 18kohms Note: It is the XPA-3 gen 1 which has an unbalanced input impedance of 47kohms (balanced 33kohms). Hopes this helps. Good luck with your project. Walt  |
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KeithL
Administrator 
Posts: 9,958
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Post by KeithL on Dec 15, 2022 14:53:30 GMT -5
Just FYI..... These guys have both single inline filters and stereo crossover modules... www.hlabs.com/products/crossovers/This is their stereo model... which can be configured to a wide variety of frequencies with jumpers... www.hlabs.com/products/crossovers/index_files/Page384.htmTheirs are all unbalanced... but you can find balanced equivalents of the single-channel version... Try places like http://www.bhphotovideo.com and Musician's Friend .... I have a pair of XPA-1s, and I want to put a high pass filter on the input so that I can send everything but the "sub" signal through the XPA-1s. To design the high pass filter I need the input impedance. In reading the specs (online) it appears the input impedance is 47 K. I am unclear if this is for the unbalanced or balanced connections. Someone suggested that if the impedance is 47 K for the unbalanced connection the balanced would be 94 K. Based on this I should use design based on 47 K per "differential leg" of the XLR connector. My knowledge of electronics is limited, so I would appreciate help in providing the correct information so I can design this properly. If antone has done this, help in the design is welcome as well. Here is a link to the page which shows how to design the filter I want, I am looking to have a 3db point of about 70 hz. www.troelsgravesen.dk/High-Pass-Filter.htm |
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Post by aceinc on Dec 15, 2022 19:25:34 GMT -5
Thanks I will check them out. |
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Post by aceinc on Dec 15, 2022 19:26:05 GMT -5
According to my Emotiva XPA owner's manual (first generation), on page 31, the XPA-1 gen 1 has the following input impedances: Unbalanced - 20kohms Balanced - 18kohms Note: It is the XPA-3 gen 1 which has an unbalanced input impedance of 47kohms (balanced 33kohms). Hopes this helps. Good luck with your project. Walt Hmm, I will need to go to my attic, find my box for the XPA-1s which should have the manuals in and check it. When I posted this I also sent an email to Emotiva, and Lonnie responded saying the unbalanced were 47 Kohms each. I wonder if he was quoting the gen 3 specs, or if the original manual is incorrect? |
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Post by AudioHTIT on Dec 15, 2022 20:50:15 GMT -5
According to my Emotiva XPA owner's manual (first generation), on page 31, the XPA-1 gen 1 has the following input impedances: Unbalanced - 20kohms Balanced - 18kohms Note: It is the XPA-3 gen 1 which has an unbalanced input impedance of 47kohms (balanced 33kohms). Hopes this helps. Good luck with your project. Walt Hmm, I will need to go to my attic, find my box for the XPA-1s which should have the manuals in and check it. When I posted this I also sent an email to Emotiva, and Lonnie responded saying the unbalanced were 47 Kohms each. I wonder if he was quoting the gen 3 specs, or if the original manual is incorrect? Not sure which Gen you have, here’s an XPA-1 manual, I believe it’s the original, or Gen 1 www.manualsdir.com/manuals/80358/emotiva-xpa-1.htmlAnd here’s an XPA-1 Gen 2 www.manualslib.com/manual/752776/Emotiva-Xpa-1-Gen-2.html |
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