Recent content by Tony Teng

I tried to cover the openings of HR with different weave fabric or different openings. I found cover the top two opening or low two opening have significant difference as plot. For me it looks like a trade off , while peak at 30hz was smooth, by 40-50Hz get worse. Which curve perform better?

Finally I finished 2 helmholtz resonators and put them in my audio room. I try several different location to find the best result. And I rear wall seems the best place so far. I make a comparison with and without HR as plot. the peak at 30HZ slightly go down. I will try to put some sponge...

The mode at 30Hz exist no matter what position I move. My plan is to make a helmholtz resonator to absorb the mode. But, how about the null at 40~50 Hz ?

Regarding the tweeters problem, I start to reposition my speakers and analysis by REW. While moving forward & backward, the measurement is as plot 1( 110CM,130CM,150CM,170Cm & 190CM mean distance from speaker face to the rear wall) While moving left & right, the measurement is as plot 2(...

Hi John: I don't know where to read the SPL during my test. Attached is the parameters I set for the measurement (most of them are default). I always ckeck level before measurement.

I made a comparison test of Gold 50 today. The plot is similar to 20180831(gold 50). I really worry about my speakers were damaged during testing.

Today I try to reposition my gold 300 speakers. At the first 15 time measurements, 30 Hz is still a mode. But later,something strange happen. The low frequency below 50Hz were gone! ( comparison as attached) Did I burn my bass?

By the way. I borrowed a pair of Monitor Audio Gold 50 bookshelf speakers(with same tweeter as gold 300) and plot as attached.

The speaker was installed 30th April 2018. The high frequency was not crystal and the bass was not powerful from the first beginning. I thought that may because of new speaker without fully run-in. But after 1 month, the sound is still wrong. So, I told the dealer came to with Omnimac and test...

The engineer of monitor audio dealer came today and find both tweeters of speakers was out of order. They are confuse why both broken at the same time. They will send new tweeters from UK to replace it.

I am using 2 channel system, not 5.1 or 7.1 So, monopole or dipole may not be the issue. regarding single wiring, I try three difference wiring( as attached pdf). Still make no different.

Hi John: I use REW generator 5K,10,15,20K HZ and play with my Macbook. meanwhile I record with RTA and the plot are as attached. The peak at individual frequency have similar dB( see attached). Then I copy each frequency wav files to my pocket SSD and play them by Cambridge 851N network player +...

Do I need to install my minisdp 2*4HD to help REW measrement?

When I play 30~39Hz test tone and walk around my room. I did hear serious ringing here and there. I will try re-position my speakers first after my business trip to Japan. I will keep you guys update my test. Thank you.

It make no difference while switch output to left channel. my ears still don't hear any sound at the last 1/3 of sweap