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#1
Posted to rec.audio.tech
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XLR into a Home Audio System
Hello everybody:
Hi, I'm looking for put a graphic equalizer between my CD player and the amp. Specifically, I haven't yet decided between the dbx 231(http://www.dbxpro.com/231.htm) or the dbx 1231 (http://www.dbxpro.com/1231.htm) As many of you shoul know such processors have only balanced XLR/TRS connectors, nevertheless their manual claim to be able to handle unbalanced connections. So far I understand that I can make my own balanced-to-unbalanced cables easily, and also, that it's better to use a transformer isolated connection in my case. Nevertheless, I'm most concern about the impedance and input signal compatibilities. As I understand impedance diferences between equipments may lead to signal degradation, noise and in the worst case to damage in the equipment. So I'm asking your kind help in order to find (or maybe build) the equipment that shall connect both systems perfectly. I want the signal to be perfect on, in order of preference, quality, impedance and voltage. What do I need for the job? Specifications of CD player and amplifier input signal a Sensivity: 150 mV Impedance: 50 kilohms amp: S/N (78' IHF): 82 dB (A, 150mV(Weighted network, input level)) Specs of the dbx 231 (and 1231) a Inputs Connectors: 1/4" TRS, female XLR (pin 2 hot) Type: Electronically balanced/unbalanced, RF filtered Impedance: Balanced 40kohm, unbalanced 20kohm Max Input Level: +21dBu balanced or unbalanced CMRR: 40dB, typically 55dB at 1kHz Outputs Connectors: 1/4" TRS, male XLR (pin 2 hot) Type: Impedance-balanced/unbalanced, RF filtered Impedance: Balanced 100ohm, unbalanced 50ohm Max Output Level: +21dBu balanced/unbalanced into 2kohm or greater +18dBm balanced/unbalanced (into 600?) Any comments are welcome Thanks JC |
#2
Posted to rec.audio.tech
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XLR into a Home Audio System
Julio Castro wrote:
Hello everybody: Hi, I'm looking for put a graphic equalizer between my CD player and the amp. Specifically, I haven't yet decided between the dbx 231(http://www.dbxpro.com/231.htm) or the dbx 1231 (http://www.dbxpro.com/1231.htm) As many of you shoul know such processors have only balanced XLR/TRS connectors, nevertheless their manual claim to be able to handle unbalanced connections. look real close at the rear view. also see specs below and not 1/4" inputs and outputs. So far I understand that I can make my own balanced-to-unbalanced cables easily, and also, that it's better to use a transformer isolated connection in my case. Nevertheless, I'm most concern about the impedance and input signal compatibilities. As I understand impedance diferences between equipments may lead to signal degradation, noise and in the worst case to damage in the equipment. So I'm asking your kind help in order to find (or maybe build) the equipment that shall connect both systems perfectly. I want the signal to be perfect on, in order of preference, quality, impedance and voltage. What do I need for the job? four 1/4" to RCA adaptors or 1/4" to RCA cables Specifications of CD player and amplifier input signal a Sensivity: 150 mV Impedance: 50 kilohms amp: S/N (78' IHF): 82 dB (A, 150mV(Weighted network, input level)) Specs of the dbx 231 (and 1231) a Inputs Connectors: 1/4" TRS, female XLR (pin 2 hot) Type: Electronically balanced/unbalanced, RF filtered Impedance: Balanced 40kohm, unbalanced 20kohm Max Input Level: +21dBu balanced or unbalanced CMRR: 40dB, typically 55dB at 1kHz Outputs Connectors: 1/4" TRS, male XLR (pin 2 hot) Type: Impedance-balanced/unbalanced, RF filtered Impedance: Balanced 100ohm, unbalanced 50ohm Max Output Level: +21dBu balanced/unbalanced into 2kohm or greater +18dBm balanced/unbalanced (into 600?) Any comments are welcome Thanks JC |
#3
Posted to rec.audio.tech
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XLR into a Home Audio System
Just make the simplest possible connections. Phono mono jack from
CD to eq, probably the same from eq to amp. Don't expect miracles. If there IS a fault in your system that requires eq, it is probably best addressed by speaker choice, speaker positioning and/or room treatment. Static eq can be useful for achieving higher gain before feedback in pa systems. But this is at the expense of fidelity. |
#4
Posted to rec.audio.tech
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XLR into a Home Audio System
Julio Castro wrote:
Hello everybody: Hi, I'm looking for put a graphic equalizer between my CD player and the amp. Specifically, I haven't yet decided between the dbx 231(http://www.dbxpro.com/231.htm) or the dbx 1231 (http://www.dbxpro.com/1231.htm) As many of you shoul know such processors have only balanced XLR/TRS connectors, nevertheless their manual claim to be able to handle unbalanced connections. What do I need for the job? First you need to rationalise why you feel a graphic EQ there at all. Then I would be inclined to find a unit with the same type of inoputs/outputs as the rest of your gear. geoff |
#5
Posted to rec.audio.tech
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XLR into a Home Audio System
"Julio Castro" wrote in message oups.com... Hello everybody: Hi, I'm looking for put a graphic equalizer between my CD player and the amp. Specifically, I haven't yet decided between the dbx 231(http://www.dbxpro.com/231.htm) or the dbx 1231 (http://www.dbxpro.com/1231.htm) As many of you shoul know such processors have only balanced XLR/TRS connectors, nevertheless their manual claim to be able to handle unbalanced connections. Then there is no problem. So far I understand that I can make my own balanced-to-unbalanced cables easily, and also, that it's better to use a transformer isolated connection in my case. Yes, and no. A high quality transformer would be expensive and unnecessary unless you plan to string the cables a very long distance, which would be why you might consider balanced lines in the first place. Lots of modern balanced equipment doesn't use transformers these days anyway. They use op-amps. Nevertheless, I'm most concern about the impedance and input signal compatibilities. As I understand impedance diferences between equipments may lead to signal degradation, noise and in the worst case to damage in the equipment. Impedance should not be a concern. These days, output impedance is usually low; input impedance is usually high - both for pro and consumer gear. Audio lines are not transmission lines requiring matched impedance. Pro signal levels are usually +4 or +8 dBm; consumer gear is sometimes -10 dBm. This is not a big enough difference to cause damage, but pro gear might overload the consumer gear. Similarly, the consumer gear might not have enough output to drive the pro gear without a booster amplifier. So I'm asking your kind help in order to find (or maybe build) the equipment that shall connect both systems perfectly. I want the signal to be perfect on, in order of preference, quality, impedance and voltage. What do I need for the job? http://www.rdlnet.com/product.php?page=43 http://www.rdlnet.com/product.php?page=45 http://www.tieline.com/Tieline_04/Pr...ons/AC200.html http://www.tieline.com/Tieline_04/Pr...ons/AC400.html Specifications of CD player and amplifier input signal a Sensivity: 150 mV Impedance: 50 kilohms amp: S/N (78' IHF): 82 dB (A, 150mV(Weighted network, input level)) Specs of the dbx 231 (and 1231) a Inputs Connectors: 1/4" TRS, female XLR (pin 2 hot) Type: Electronically balanced/unbalanced, RF filtered Impedance: Balanced 40kohm, unbalanced 20kohm Max Input Level: +21dBu balanced or unbalanced CMRR: 40dB, typically 55dB at 1kHz Outputs Connectors: 1/4" TRS, male XLR (pin 2 hot) Type: Impedance-balanced/unbalanced, RF filtered Impedance: Balanced 100ohm, unbalanced 50ohm Max Output Level: +21dBu balanced/unbalanced into 2kohm or greater +18dBm balanced/unbalanced (into 600?) Any comments are welcome Thanks JC |
#6
Posted to rec.audio.tech
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XLR into a Home Audio System
"Julio Castro" wrote in
message oups.com Hello everybody: Hi, I'm looking for put a graphic equalizer between my CD player and the amp. Specifically, I haven't yet decided between the dbx 231(http://www.dbxpro.com/231.htm) or the dbx 1231 (http://www.dbxpro.com/1231.htm) As many of you should know such processors have only balanced XLR/TRS connectors, nevertheless their manual claim to be able to handle unbalanced connections. Not universally true. For example, some Rane graphic eqs have both pro and RCA connectors. So far I understand that I can make my own balanced-to-unbalanced cables easily, Please see for the usual reference in this area: http://www.rane.com/note110.html and also, that it's better to use a transformer isolated connection in my case. In all liklihood - unecessary. Nevertheless, I'm most concern about the impedance and input signal compatibilities. As I understand impedance diferences between equipments may lead to signal degradation, noise Shouldn't be a problem, as signal levels out of a CD player are typically not all that dissimilar from pro audio conventions. Putting the eq in the tape loop of a home system could be a different situation. and in the worst case to damage in the equipment. No way! So I'm asking your kind help in order to find (or maybe build) the equipment that shall connect both systems perfectly. I want the signal to be perfect on, in order of preference, quality, impedance and voltage. What do I need for the job? Simple cables or adaptors. Specifications of CD player and amplifier input signal a Sensivity: 150 mV Impedance: 50 kilohms amp: S/N (78' IHF): 82 dB (A, 150mV(Weighted network, input level)) These are for just the integrated amp, right? Specs of the dbx 231 (and 1231) a Inputs Connectors: 1/4" TRS, female XLR (pin 2 hot) Type: Electronically balanced/unbalanced, RF filtered Impedance: Balanced 40kohm, unbalanced 20kohm Max Input Level: +21dBu balanced or unbalanced CMRR: 40dB, typically 55dB at 1kHz Outputs Connectors: 1/4" TRS, male XLR (pin 2 hot) Type: Impedance-balanced/unbalanced, RF filtered Impedance: Balanced 100ohm, unbalanced 50ohm Max Output Level: +21dBu balanced/unbalanced into 2kohm or greater +18dBm balanced/unbalanced (into 600?) |
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