| π Speakers 12π [message #28304 is a reply to message #28299] |
Sun, 21 October 2007 13:56   |
 |
Wayne Parham
Messages: 18835
Registered: January 2001
|
Illuminati (33rd Degree) |
|
|
12 π basshorn sub
First, we measured impedance and found Zmin to be 2.8Ω. So 16.7v is required for 100 watts, 23.7v for 200 watts, 33.5v for 400 watts, 47.3v for 800 watts and 66.9v for 1600 watts.
12 π impedance
Next, we measured output at 28.3v. Since we measured 10 meters away, the values correspond to 2.83v/1M.
The blue line is SPL, and the violet line shows distortion. Since measurement was taken at 10 meters, add 20dB to find SPL at 1 meter. With 100 watts input, the 10 meter measurement works out the same as 1 watt input measured at a distance of 1 meter.
12 π response at 10 meters with 28.3v input (2.83v/1M)
From this, we perform an inverse FFT to obtain impulse and step response:
12 π Impulse Response
12 π Step Response[/img]
Measurement at 100 watts:
12 π response at 10 meters with 16.7v (100w) input (1W/1M)
Measurement at 200 watts:
12 π response at 10 meters with 23.7v (200w) input
Measurement at 400 watts:
12 π response at 10 meters with 33.5v (400w) input
Measurement at 800 watts:
12 π response at 10 meters with 47.3v (800w) input
Measurement at 1600 watts:
12 π response at 10 meters with 66.9v (1600w) input |
|
|
|
|
|
|
|
| Re: Fitzmaurice Titan 48 [message #28307 is a reply to message #28302] |
Wed, 24 October 2007 09:31 |
lelandcrooks
Messages: 12
Registered: May 2009
|
Chancellor |
|
|
Thought I might add a version definition also. The t48 can be configured with two chamber sizes. The model tested is the large chamber version, which improves response below 40hz. The smaller chamber improves response above 40 hz., up to a couple of db across the board, at the expense of response below 40hz.
|
|
|
|
Posting Rules
Members
Search
Help
Register
Login
Get a T-Shirt!
