Bic Acoustech PL-200 Data-Bass test results - Page 3 - AVS Forum | Home Theater Discussions And Reviews
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Old 04-17-2015, 07:41 PM
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Originally Posted by nograveconcern View Post
No. The driver unloads in this alignment under tune causing distortion.

Look at this pic. At the 45 hz distortion increases only slightly from 95 db to the 110 db line. Below 45 hz (which is approximately the enclosures tune) distortion spikes out of control as SPL increases and frequency decreases (this is evidence of the driver unloading).

At low SPL (95 db line) you have acceptable THD (10%) to ~28 Hz. At high SPL (110 db) it hit's 10% THD at ~39 Hz.

This is constant. You can't change this frequency to THD relationship with EQ. All you can do is use a highpass to reduce signal at and below 40Hz to keep THD in check.
Just to clarify:

Would ~45 Hz be the resonant frequency of the driver, and ~40 Hz the tune of the enclosure?
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Old 04-18-2015, 07:21 AM
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Originally Posted by Dom Di Stroia View Post
Just to clarify:

Would ~45 Hz be the resonant frequency of the driver, and ~40 Hz the tune of the enclosure?
Not quite. ~45 Hz is where distortion is best controlled. Distortion is mostly caused by driver excursion, so we can infer that the frequency the box is tuned to (fb) is ~45 since that is the point where the driver moves the least causing the port to resonate instead.

We don't know the resonant frequency of the driver, and it really doesn't matter. What's important is that the box is tuned about 20Hz higher than we would like.

If you look at the data bass frequency chart you will see a aprox 15db/octave slope to about 25hz. That means that in room you may have a more even response to 25hz due to room gain, but keep in mind that below 38hz distortion becomes audible due to the high fb.

Originally Posted by Ricci View Post
The PL-200 was measured in the standard 2 meter ground plane configuration used for all Data-Bass subwoofer tests.
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Old 04-18-2015, 08:30 AM
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Originally Posted by Dom Di Stroia View Post
I think that 95 dB at 1 metre falls within the moderate-to-high range of output.
Small vs Large signals often refer to the input voltage (small eg from Bluray player or preamp) vs the output voltage from amp to speaker (Large).

In this context, small signals would be those that don't induce power/excursion related distortion. The driver or subwoofer would show a linear response at .5w, 1w, 10w. Distortion isn't appreciably changing.

Large signals are where the rubber meets the road, if your application is SPL-limited. 100w, 200w, 1000w, etc. This tells you, how hard can I push this thing?

So a Frequency Response graph showing great extension to 28Hz can be misleading.
Like, "Look how I can lift this ruler with speed, control, acceleration. I made a graph, even. So, you should extrapolate that if we give me a broadsword, I will swing it the same control and speed. And a 200lb dumbbell, too!"

In reality, we know it's BS and only Hulk could swing a dumbbell like it was a little ruler.

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Old 05-19-2015, 12:29 AM
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Is Bic Acoustech New Model Platinum Series PL-200 a huge upgrade to PL-200?

Last edited by Showmak; 05-19-2015 at 01:01 AM.
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Old 05-19-2015, 03:41 AM
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After the PL-200 came out, it was almost a year before anyone did an objective test. Ricci did his test later (

The new amp will be (somewhat?) more powerful but I would not expect a substantial improvement on the previous PL-200 that is also very highly regarded in this forum.
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