Setting up SDA speakers with Yamaha AX-700u integrated amp
vulcan
Posts: 91
I have a new amplifier i want to connect up my SDA speakers to. I recently serviced this Yamaha AX-700u integrated amp and want to test it. Not sure if this a common ground and wanted some advice. I did use a meter and have continuity between both the r/l black(-) speaker terminals to the ground connector on the back. Does this sound like a common ground amp? thanks in advance.
Polk Audio SDA 1C, Klipsch Legend KLF 20, Klipsch Chorus II
Comments
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It's common ground.
Nice integrated amp. I had both the AX500 and 900. Loved them both. -
I have a new amplifier i want to connect up my SDA speakers to. I recently serviced this Yamaha AX-700u integrated amp and want to test it. Not sure if this a common ground and wanted some advice. I did use a meter and have continuity between both the r/l black(-) speaker terminals to the ground connector on the back. Does this sound like a common ground amp? thanks in advance.
I know Ivan already answered your question, just wanted to tell you that to test for common ground you do so between the r/l black(-) speaker terminals only.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
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Not sure there's anything particularly "inflated" about the AX-700U power claim.
https://www.hifiengine.com/manual_library/yamaha/ax-700.shtml
https://www.canuckaudiomart.com/details/649371245-refurbished-1989-yamaha-ax700u-integrated-amplifier-135wpc-japn-price-includes-shipping/
Looks OK for its era.
That said, probably not a very viable choice for any traditional SDAs given common ground amplifiers and the relatively limited apparent current delivery capability.
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I looked it up a couple days ago. Couldn't find any independent testing reviews. I like that they give the dynamic power and headroom at both 8 and 4 ohms, BUT it always bugs the heck out of me when they *verbally* brag about its low impedance driving qualities in a non-quantitative manner but do not even RATE IT at 4 ohms, as far as a continuous RMS wattage rating.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
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As I sated I had two the AX500 and the AX900 both played above their rated wpc IMHO. In those days Yamaha under rated their gear, as for 4ohm I never tried it at 4ohm. I can state for a fact the AX900 and my Cerwin Vega D7's got me in hot water more than once
I opened my door to Johnny Law -
As I stated I had two the AX500 and the AX900 both played above their rated wpc IMHO. In those days Yamaha under rated their gear, as for 4ohm I never tried it at 4ohm. I can state for a fact the AX900 and my Cerwin Vega D7's got me in hot water more than once I opened my door to Johnny Law. As for SDA's I wouldn't try it on the big boys or something like the SDA2a. It's not going to be the best but if you have some of the SDA2b or SDA1c it would work if you don't try and drive them like race cars.
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If each pair is rated at 70 watts max and there's 2 pair pair channel....well, do the math.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
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Are you on medication?Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
This content has been removed.
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The nakamichi pa5 and pa7 are not common ground amps.
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The threshold stasis that these are based on are not common ground, maybe nakamichi tweaked the design.
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The threshold stasis that these are based on are not common ground, maybe nakamichi tweaked the design.
They did -
I did use a meter and have continuity between both the r/l black(-) speaker terminals to the ground connector on the back. Does this sound like a common ground amp?
"Continuity" is meaningless for determining compatibility with SDA speakers.It's common ground.
.000000001 ohm is "continuity". 20 ohms is "continuity"
20 ohms will not work with SDAs.
You need to determine the resistance in ohms, and "less than one ohm" would be compatible with SDAs. Lower is better.
Pretty-much all amplifiers will "play above their rated WPC". It's not difficult...if you're willing to also "play above the rated THD + noise"I had two the AX500 and the AX900 both played above their rated wpc
Not having an FTC rating for 4-ohm use (or, like newer Yammie amps, having FTC rating for 4 ohm use but only if the Strangulation Switch on the back panel is engaged) would make me VERY suspicious. Either there's not enough power supply, not enough heat sink, or not enough output devices--or some combination.
