loud scratches by sda 2B
german
Posts: 22
Listening music (SDA2-B--Accuphase 405) with Power level at one o`clock ,sound from the left Sda suddenly was overlayed with a very very loud scratching in the pulse of the high tone music-pulse. Did I reach the limit of the SDA?Or did I ruin a speaker.Now I`m not sure how much power I can give to the SDA.
Although I realized,that the SDA eats much of power.
Although I realized,that the SDA eats much of power.
Post edited by german on
Comments
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"one o'clock"
ding ding ding
Volume Knob Past 12 Oclock = Distortion...
Sounds like you need more powa or need to turn it down...either way- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit. -
no,no--the Accuphase E 405 doesn´t know,what distortion is,even not at highest power.Volume Knob Past 12 Oclock = Distortion... -
Originally posted by german
Did I reach the limit of the SDA?Or did I ruin a speaker.Now I`m not sure how much power I can give to the SDA.
Nope, you reached the limits of your integrated amp. The SDA 2Bs are rated compatible with amps up to 350 watts/channel. Doesn't the amp have clipping indicators on the meters? It's not a good idea to run it to red line. Keep the volume knob below 12 o'clock and tone controls to flat. Get another amp or different speakers if you want more impact. You can check to see if you've blown a tweeter by swapping them. If you have blown one, you should replace them both, preferably with the new silk replacements once they are in stock again. -
on the vu meter 0db is shown as 340 Watts at 4 ohm.one o`clock is going up to +3 db but only in the peaks.
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Originally posted by german
no,no--the Accuphase E 405 doesn´t know,what distortion is,even not at highest power.
Want to bet!?!
You drove the amp into clipping and fried either a tweeter or mid-driver. The golden rule, never turn it up past half way.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 -
german,
F1nut is right, you never want to push your volume control past 12:00 or you could over drive the amp and cause it to clip. I try to error on the conservative side and never push it past 11:00. Of course there are those nights when me and the boys are well into a second case of Sams and I may come close to 12:00, but 1:00 no, not even then.
As far as checking your tweeter. Take it out of the cabinet and run the speaker wire directly to the tweeter. If its messed up youll know for sure. Just keep the volume real low during the test.
Good Luck!
O -
Polk abuse! Polk abuse!
IME, if I give monitors or SDAs 200-300 WPC of clean power to play with, I have to push the volume to painful levels before I even come close to causing distortion/clipping problems. I've only done it once or twice in my life, just to see how far I could push things. I cannot imagine anyone listening at those kind of levels. It makes any source unmusical, and if you want to hold a rock concert, go buy some cheap PA spkeakers rather than exposing Polks to that kind of torture...
Looking at the specs for the Accuphase 405, it claims 170 wpc @ 8 ohms and 250 wpc @ 4 ohms. If you are turning the volume to 1:00, something is WAY wrong. Either those are not legit power ratings (like peak vs. continuous) or you are just expecting ridiculous amounts of volume. -
Originally posted by polksda
or you are just expecting ridiculous amounts of volume.
BINGO!Dodd - Battery Preamp
Monarchy Audio SE100 Delux - mono power amps
Sony DVP-NS999ES - SACD player
ADS 1230 - Polk SDA 2B
DIY Stereo Subwoofer towers w/(4) 12 drivers each
Crown K1 - Subwoofer amp
Outlaw ICBM - crossover
Beringher BFD - sub eq
Where is the remote? Where is the $%#$% remote!
"I've always been mad, I know I've been mad, like the most of us have...very hard to explain why you're mad, even if you're not mad..." -
@ polksdaI've only done it once or twice in my life
so you`ve done it one time more than me with the SDA`s.It only was a test,how far the SDAs can eat the absolutely clean power of the Accüphase.Normally clipping or speaker overload appears after an increase of distortion. In this case there was no severe distortion to be heard before these very loud scratches out of the left high speaker appeared. Also this speaker is definitely not blown.Also the Accuphase will not clipp at one o`clock.The maximum heat dissipation of the five push pull transistors per channel is 1.300 Watts. --Doesn´t matter what it was-naturally I´m not listening to music at these levels. With the SDA´s I`m used to listen with 50 -100 Watts peak.
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well I have literally watched those old tweeters melt under moderate/loud volumes...
Time to get the new ones no how, much better tweeters no how...- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit. -
Accuphase makes a good product, but at the volume level you had it at, it clipped. The loud scratching noise you heard proves it.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 -
Originally posted by german
It only was a test, how far the SDAs can eat the absolutely clean power of the Accüphase. Normally clipping or speaker overload appears after an increase of distortion. In this case there was no severe distortion to be heard before these very loud scratches out of the left high speaker appeared. Also this speaker is definitely not blown. Also the Accuphase will not clipp at one o`clock. The maximum heat dissipation of the five push pull transistors per channel is 1.300 Watts. --Doesn´t matter what it was-naturally I´m not listening to music at these levels. With the SDA´s I`m used to listen with 50 -100 Watts peak.
[bold emphasis added above]
At the risk of sounding like a smartass...
Mkay, so you are having a love affair with your amp. You clearly believe that you didn't clip it by pushing the volume too loud. Since you don't believe your amp could possibly clip, I suggest you find a set of speakers more suited to your orgasmic amplifier at the volume levels you seek... obviously the Polks aren't it. -
@polksdaMkay, so you are having a love affair with your amp
Oh yeah,I really love that great Amp.Like I love the SDA-Sound.
----And I sware,I will never again abuse your so beloved SDAs.
--I hope you`ll ever forgive my so bad and evil traitment of your so loved SDA .
