Answered Harman kardon hk980 treble limiter

[S3s220390]

Hello everyone,
Just had a strange fact with my integrated amp , (Harman Kardon hk980 2x80w rated at 8ohms), powering a pair of taga harmony tower speakers rated on 180rms 6ohms.
I ran them a couple of hours over half the volume ,everything good so far ,loud and clear ,no distortion ,and suddenly the treble disappeared...I immediately turned the volume down almost to the half volume spectrum and the treble reappeared. I run the tone correction ,treble 5/10 and the bass 4/10 where /10 is the max spectrum.is it a common issue with amps or speakers?
Best regards

 

[JohnnyNapalm]

Hi running the amp at over half volume would certainly test the the limit of both amp and speaker. The fact that the treble returned when you turned it down would indicate that the tweeter cooled and began to work again. I don’t know if the speakers have a thermal protection device to save the tweeters? Unlikely to be the amp but when being driven at high output distortion can start to creep in. Guess what dies first? Yes, usually, the tweeter. It sounds like you had a close call. Hope this helps. Cheers.

 

[S3s220390]

Hi running the amp at over half volume would certainly test the the limit of both amp and speaker. The fact that the treble returned when you turned it down would indicate that the tweeter cooled and began to work again. I don’t know if the speakers have a thermal protection device to save the tweeters? Unlikely to be the amp but when being driven at high output distortion can start to creep in. Guess what dies first? Yes, usually, the tweeter. It sounds like you had a close call. Hope this helps. Cheers.

Hi , thanks for the reply!
It make sense indeed.i only know that the speakers have filters inside and have the possibility to bi-wire them.

 

[JohnnyNapalm]

True bi-amping would help but it always costs. Welcome to the pursuit of audio Nevada.! With an amp producing 80w at 8ohm running your speaker I would imagine you can achieve a fairly high spl. Have you noticed at high listening levels that the sound becomes a little more harsh or hard in sound?

 

[S3s220390]

True bi-amping would help but it always costs. Welcome to the pursuit of audio Nevada.! With an amp producing 80w at 8ohm running your speaker I would imagine you can achieve a fairly high spl. Have you noticed at high listening levels that the sound becomes a little more harsh or hard in sound?

If i go on max volume it will be a problem, distortion will occur.The amp and speakers are in the hi-fi entry level area and didn’t cost too much,around 1000$,pretty cheap for how they perform.Good crisp sound with plenty of detail and bass on mid and high volume.I rarely listen them at that level especially on that fairly amound of time mentioned in the beginning of the thread , but really didn’t noticed they have a hard time doing it. No distorsion or what so ever.The only thing i think i noticed is that ,after i turned down the volume from -5db the treble reappeared at -20db (+10db is the max volume) , the level of sound wasn’t as high, as turning the volume for the first time to -20db .Or maybe my hearing got used with the high level and didn’t perceive it correctly. Hope it makes sense