SDA-2B's Miraculous Change
Tanveer Suleman
Posts: 7
Hi,
I'm new to Polk Club. I have just got SDA-2B's three days ago. I connected them to my Sansui Alpha 607 L Extra (110 RMS). I was getting the frequencies of 4K to 8K a bit higher than normal. That thing was disturbing the whole sound stage. I have some experience of sound engineering. I got a 2.2uf 50v myler capacitor in series with the positive wire of Tweeter. Believe you me the result was amazing. I have heard SDA-1Cs attached with Adcom's Pre-Power ( I Think it was 555 ) but the sound had not sufficient bass at all. But my SDA-2Bs were sounding superb after this amendment. I was planning to change the tweeters with SL-2000T (RD-0194) as I was unable to get the required HF from the old ones but I think I do not need to have them any more. I think I'm getting the richest sound out of them right now and there's non need to add any sub as most of the people say. After this change ther'e not a single harshness in tweeters that some people say that it becomes harsh at some times. I must say that in stereo sound there's no speaker matching the sound stage of SDAs (Placement matters a lot). Let's give it a try and experience what happens.
I'm new to Polk Club. I have just got SDA-2B's three days ago. I connected them to my Sansui Alpha 607 L Extra (110 RMS). I was getting the frequencies of 4K to 8K a bit higher than normal. That thing was disturbing the whole sound stage. I have some experience of sound engineering. I got a 2.2uf 50v myler capacitor in series with the positive wire of Tweeter. Believe you me the result was amazing. I have heard SDA-1Cs attached with Adcom's Pre-Power ( I Think it was 555 ) but the sound had not sufficient bass at all. But my SDA-2Bs were sounding superb after this amendment. I was planning to change the tweeters with SL-2000T (RD-0194) as I was unable to get the required HF from the old ones but I think I do not need to have them any more. I think I'm getting the richest sound out of them right now and there's non need to add any sub as most of the people say. After this change ther'e not a single harshness in tweeters that some people say that it becomes harsh at some times. I must say that in stereo sound there's no speaker matching the sound stage of SDAs (Placement matters a lot). Let's give it a try and experience what happens.
Post edited by Tanveer Suleman on
Comments
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Welcome!
Please edit your other post, just delete the content and type in EDIT. That way you'll only get responses in one thread.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 -
So, how did you come up with the value for the added cap? Why not just add a resistor in series to tone down the tweeter?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 -
Hi F1net
Normally the Caps used for HF range from 1uf to 4.7uf. Initally I added 1uf. It made the HF soft but pinching at frequency of 22Khz and above. Then I came up with 2.2uf and the result was amazing. I could also attach 3.3uf but it would decrease HF. Actually the shrillness was due to raised frequencies from 4KHz to 8KHz. A resistor would definitely decrease the impact of tweeter but there was also an issue of clarity of HF which could be obtained only by adding a cap in series. -
Thank you for your answer.
Something about, "pinching at frequency of 22Khz and above" struck me as odd as we can't hear that high. Were you using a scope for this? Also, you say the shrillness was in the 4kHz to 8kHz range. The SL2000 is known to have a 5dB spike at 13kHz, perhaps that is what you were really hearing. None the less, I'm glad you're happy with the results.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 -
Actually Sansui 607 L Extra have some loudy and bold response. If I got some ADCOM's Pre-Power attached with these speakers, I would not have amended the crossover. I was just to match the aplifier with these speakers. Pinching means the sound of "S" got prominent out of the whole spectrum which was unbearable and one could easily had an head-ache while listening this sound.
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Ah, we call it sibilance. Where are you located?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 -
I'm from Pakistan not from U.S. I'm not familiar with "sibilance".
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The "S" or "sibilance" hurts my ears too after a short time.
Your crossover may be able to use the SL3000 (RD-0198) tweeter. Check if your crossover looks like this: http://www.polkaudio.com/forums/showthread.php?t=40577 -
Yes my 2Bs have the same crossover. I had also used SL-3000 and noticed that the vocals were recessed. Then I preferred to have SL-2000 back in the cabinets because it needed major changes in the crossover to fit SL-3000. As in Pakistan, its quite difficult to have quality caps from market, so I did not try to amend the crossover.
Have you tried Oehlbach interconnects and speaker wire? How do you rate them?
