I just picked up a nice SX-850 on ebay. I am going to take it to the cottage this weekend and hook it up to a pair of Yamaha NS-555 6ohm speakers. I plan to bi-wire using both A and B channels for just the two speakers. The back of the receiver says 8ohm A & B, 4ohm A, B. Is this setup going to be ok? I don't want to burn up this work of art.
SX-850 with 6ohm speakers.
- Thread starter tdalzell
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OverLoad
High On Solder Fumes
Well he wants to bi-wire the speakers. Have you seen the push button terminals on those Pioneers? It might be a little difficult trying to accomodate bi-wires with a reasonable guage
Each speaker has four posts, two for the woofers and two for the other drivers. I take the jumpers off the speakers (that allows for traditional wiring) and I run two sets of wires to each speaker, A & B right to the right speaker and A & B left to the left speaker. Then I run the two speakers with both A & B button pushed in. The benefits of bi-wiring are very debateable (just google it). I already have two sets of wires running to each speaker so I am going to try bi-wire and regular to see if I notice any difference with the "new" receiver.
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OverLoad
High On Solder Fumes
You need bi-wire/bi-amp speakers which means the high pass and low pass nodes of the speaker crossovers can be seperated. One pair of speaker wires hookup from the amp (this case receiver) channel routed to the low pass speaker terminals and another pair to the low pass. Of course the same goes for the other channel and speaker.OK, I have an SX-850, Bi-Wiring? Whats that? I am using one set of speakers on A.:scratch2:
Thanks,
John.
Lets not turn this into a whole bi-wire thing. The OP had a basic question and it's been answered.
Vinylcalle
Active Member
Well I would say it depends. The nominal impedance of the speakers you say is 6 ohms. If you separate them tweeter/midrange and bass or how they made it you need to know the new impedance loads. If we guess that its 6 ohms for the upper one and 6 ohms for the lower your amplifier will drive a load of 3 ohms if done as you are thinking.
Perhaps the sx-850 will handle that but i doubt it in the long run. And the advantage of getting more power is perhaps now longer true at such demanding loads.
Anybody is free to correct me.
Perhaps the sx-850 will handle that but i doubt it in the long run. And the advantage of getting more power is perhaps now longer true at such demanding loads.
Anybody is free to correct me.
OverLoad
High On Solder Fumes
Vinylcalle, you are completely incorrect. Think about it for a moment; the OP is BI-WIRING the speakers. How does the fact the LF and HF nodes of the speaker's crossovers being seperated but still connected to the same amplifier output change anything? HINT: It doesn't
Wouldn't that effectively add inductance to the crossover network? Separating the band pass filters then placing an additional X feet of wire (Lenz's Law says that is an inductor) will skew the choke point, thus the crossover design. Additionally, traditional parallel wire speaker cable will also add some capacitance at any considerable lead length, so factor that into your project. I suppose if you simultaneously alter the capacitance and other chokes in the crossover it would not have a detrimental effect. Conversely, you likely won't have gained a thing. You might as well stick magnets on your fuel line thinking you will get 10MPG more. It could just sound really mushy in between the intended crossover points.
Why not take is a step further and build the crossovers into the amp, preferably upstream of the final outputs? That way you could optimize the design of each amp and power supply for its intended output frequency range. I hope your speakers are that good. I hope your ears are that good, too.
Fortunately, it probably won't do any damage to the amp nor the drivers, so it's only copper and time that you stand to lose.
Incidentally, for every foot of speaker lead you install you need to calculate 4X that length as the inductance added to the crossover circuit since it separates the elements of the band passes by that much wire (i.e., inductance and a little capacitance).
I know from practice that even a 4kHz signal at reasonable power and amplitude will create inductance in even a balanced line and it can get bad enough to produce reflected energy in as little as 50' of cable to the point where additional output impedance matching or filters are required.
Frankly, a well designed crossover an larger gauge leads will likely yield superior results.
Why not take is a step further and build the crossovers into the amp, preferably upstream of the final outputs? That way you could optimize the design of each amp and power supply for its intended output frequency range. I hope your speakers are that good. I hope your ears are that good, too.
Fortunately, it probably won't do any damage to the amp nor the drivers, so it's only copper and time that you stand to lose.
Incidentally, for every foot of speaker lead you install you need to calculate 4X that length as the inductance added to the crossover circuit since it separates the elements of the band passes by that much wire (i.e., inductance and a little capacitance).
I know from practice that even a 4kHz signal at reasonable power and amplitude will create inductance in even a balanced line and it can get bad enough to produce reflected energy in as little as 50' of cable to the point where additional output impedance matching or filters are required.
Frankly, a well designed crossover an larger gauge leads will likely yield superior results.
OverLoad
High On Solder Fumes
I think the OP had a simple concern regarding the load and speaker impedance when he bi-wires his speakers.
Instead of a single length of speaker wire from the receiver output to the parallel connected HF and LF nodes, he will have the nodes seperated with each having it's own length of wire. Following some basic rules of wire gauge versus length etc. within reason, I don't think the resistance, capacitance and inductance of the speaker wires will have much effect relative to the speakers or amp (unless he plans on running them in a football stadium or something).
This is starting to get silly IMHO and now treading in the territory of a cable/wire debate. Let's throw in skin effect while we are at it
Stick a fork in it!
Instead of a single length of speaker wire from the receiver output to the parallel connected HF and LF nodes, he will have the nodes seperated with each having it's own length of wire. Following some basic rules of wire gauge versus length etc. within reason, I don't think the resistance, capacitance and inductance of the speaker wires will have much effect relative to the speakers or amp (unless he plans on running them in a football stadium or something).
This is starting to get silly IMHO and now treading in the territory of a cable/wire debate. Let's throw in skin effect while we are at it
Stick a fork in it!
Vinylcalle
Active Member
Vinylcalle, you are completely incorrect. Think about it for a moment; the OP is BI-WIRING the speakers. How does the fact the LF and HF nodes of the speaker's crossovers being seperated but still connected to the same amplifier output change anything? HINT: It doesn't
Hmm. You´re right. I didn´t see the whole picture so to speak.
Well question answered than. Just do it!