Hello,
Recently, I built a pair of Solstice MLTL speakers using Parts Express kit. Speakers did produce sound; however, it was boomy at some frequencies. In addition, I had an impression that bass is wear and generally speakers are not "sweet sounding" with some music such as guitar and jazz.
This is my first speaker built, so I asked a friend who is much more experienced in this craft for help. He said they should be tuned up but first, an impedance measurements should be done.
We did this today, both for assembled cabinets and drivers taken out of them. Input was a signal from a generator at 1V RMS or 3V RMS, a 1kOhm resistor was connected in series with the generator and a True RMS Triplett 9045 DMM was used to measure voltage at speaker or woofer terminals.
What we got for assembled cabinets is a pronounced peak at 70 Hz that gradually goes down with decreasing of the input frequency up to 40 Hz and then a second, smaller peak at 26 Hz. Results are attached as EXCEL files and are virtually identical for both speakers.
For individual woofers, Morel TiCW 638 Nd, results were different if a woofer was measured in a cabinet or removed from it. In the first case, we found resonant frequency at 50 Hz; for the driver alone, it was approximately 60 Hz. Measurement results are also attached.
Now the question is: how to tune up the Solstices to lower the 70 Hz peak which is most likely is the reason for "boominess" and increase output at 40 Hz. A friend of mine said it might be very difficult if not impossible since the resonance frequency of the Morel woofer alone is 60 Hz.
I would be willing to try any and all suggestions since in the current state speakers are just not working right.
Recently, I built a pair of Solstice MLTL speakers using Parts Express kit. Speakers did produce sound; however, it was boomy at some frequencies. In addition, I had an impression that bass is wear and generally speakers are not "sweet sounding" with some music such as guitar and jazz.
This is my first speaker built, so I asked a friend who is much more experienced in this craft for help. He said they should be tuned up but first, an impedance measurements should be done.
We did this today, both for assembled cabinets and drivers taken out of them. Input was a signal from a generator at 1V RMS or 3V RMS, a 1kOhm resistor was connected in series with the generator and a True RMS Triplett 9045 DMM was used to measure voltage at speaker or woofer terminals.
What we got for assembled cabinets is a pronounced peak at 70 Hz that gradually goes down with decreasing of the input frequency up to 40 Hz and then a second, smaller peak at 26 Hz. Results are attached as EXCEL files and are virtually identical for both speakers.
For individual woofers, Morel TiCW 638 Nd, results were different if a woofer was measured in a cabinet or removed from it. In the first case, we found resonant frequency at 50 Hz; for the driver alone, it was approximately 60 Hz. Measurement results are also attached.
Now the question is: how to tune up the Solstices to lower the 70 Hz peak which is most likely is the reason for "boominess" and increase output at 40 Hz. A friend of mine said it might be very difficult if not impossible since the resonance frequency of the Morel woofer alone is 60 Hz.
I would be willing to try any and all suggestions since in the current state speakers are just not working right.
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