Bic Acoustech PL-200 Data-Bass test results - Page 3 - AVS | Home Theater Discussions And Reviews
Baselworld is only a few weeks away. Getting the latest news is easy, Click Here for info on how to join the Watchuseek.com newsletter list. Follow our team for updates featuring event coverage, new product unveilings, watch industry news & more!


Forum Jump: 
 7Likes
Reply
 
Thread Tools
post #61 of 65 Old 04-17-2015, 07:41 PM
Senior Member
 
Dom Di Stroia's Avatar
 
Join Date: Mar 2013
Location: The Right Side of Left Behind
Posts: 231
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 112 Post(s)
Liked: 77
Quote:
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?

A/VR: 1 x Sony STR-DE598
L/R + C: 2 x BIC Venturi DV62si + 1 x BIC Venturi V52
Sub: 1 x BIC RtR RtR-12S
Surrounds: 2 x Klipsch Synergy B-20
Monitor: 1 x LG 24EA53V-PA.AUSNJVN (Panel: LG Display AH-IPS)
Display: 1 x Samsung UN-46EH6000FXZC CS01 (Panel: Chi Mei InnoLux S-MVA 46P1AF0D)
Dom Di Stroia is offline  
Sponsored Links
Advertisement
 
post #62 of 65 Old 04-18-2015, 07:21 AM
Advanced Member
 
nograveconcern's Avatar
 
Join Date: Aug 2012
Location: Atlanta GA
Posts: 717
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 57 Post(s)
Liked: 84
Quote:
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.

Quote:
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.
nograveconcern is offline  
post #63 of 65 Old 04-18-2015, 08:30 AM
AVS Special Member
 
Eyleron's Avatar
 
Join Date: Dec 2003
Location: Minot, ND
Posts: 2,395
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 210 Post(s)
Liked: 104
Quote:
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.

SEOS Fusion 10 Max, SVS PB10 and DIY SI18 subs, Denon X4000, Epson 8500 & 2.35:1 AT Screen
DIY Sound Group: Information and Tips
Eyleron is online now  
post #64 of 65 Old Today, 12:29 AM
Member
 
Showmak's Avatar
 
Join Date: Dec 2005
Posts: 87
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Is Bic Acoustech New Model Platinum Series PL-200 a huge upgrade to PL-200?

http://www.acousticsounddesign.com/c...pid=1555&sc=28

Last edited by Showmak; Today at 01:01 AM.
Showmak is offline  
post #65 of 65 Old Today, 03:41 AM
AVS Special Member
 
wwinkler's Avatar
 
Join Date: Jul 2009
Location: northern virginia
Posts: 1,370
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 24
After the PL-200 came out, it was almost a year before anyone did an objective test. Ricci did his test later (www.data-bass.com).

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.
wwinkler is online now  
Sponsored Links
Advertisement
 
Reply Subwoofers, Bass, and Transducers

Tags
Bic Pl 200 Acoustech Platinum Series Subwoofer



Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off