K&K Development 


PC platform: Windows 11 and Windows 10.

With a fast test time and high performance due to parallel processing the P900 is very cost-effective in a fully automated environment. A complete test sequence can with a single sweep be executed within 0.1 to 3 seconds comprising following parameters:
Frequency response, Sensitivity, Average, Polarity, Phase, SPL, Rub & Buzz, THD, Impedance, Resonance,
Loudness, Current distortion, EBP, Q, F (F-res. / Q), Re, BL (center of coil) and T/S parameters etc.  

Ambient noise check ensure reliable test results and if noise level to high automatic repeat the test.
A built-in multiplex function allows a single system to control two different test lines.

Test data and results are presented graphically on screen and can be stored together with a serial number locally, or through a network for statistics and post-processing.

Access to change of parameters is controlled by a Pass Word Manager.

A master compensation function make is possible to substitute a reference speaker or another test system. An output compressor enables the system to test microphones.

The software has a number of utilities as statistical analysis, export, import and copy of data as well as an optional match function. Statistical analysis includes calculation of various numbers of standard deviation and average curves to determine the test limits. The analysis is able to find a best matched unit against the average or another stored unit. The system has Ai-mode to recalculate and modifies tolerance limits in run-mode.

A log utility manager makes an automatic registration of every change in setup parameters. This together with a restore / fold back function makes this utility very powerful.

A hardware manager makes changes and calibration of installed hardware very easy.

P900  The P900 generates sufficient power with the internal power amplifier to energize all defects from air-gap problems, puffing sounds, loose particles, constrained voice coil, cabinet rattling, litze wire clatter, glue problems etc., which generally speaking are known as Rub & Buzz distortion.

The system consists of a 19" P900 cabinet with a 14 volt power amplifier. The power amplifier has a 120 VA core.
The system have 2 speakon connection for for internal power amplifier. This enable the system to test on 2 different test booths.
On the front 3 phantom powered XLR input for microphone or line, (input 1, 2  and 3), the phantom power is controlled by software.  
Futhermore 3 Lemo connection, (input 3, 4 and 5) used for B&K, Grass, ACO etc. microphones including microphone psu with 28V and 200V.
As an option the 3 XLR or the 3 Lemo inputs can be a BNC input CCP powered microphones. Constant current is 4 mA.
Max 6 XLR where 3 x XLR with phantom power or 3 Lemo or 3 xBNC plug are allowed as option. A mix is possible.
On rear a jack output for external power amplifier connection and a input for external impedance measurement if interbnal power amplifier is disabled. A 25 plole plug for digital in & outputs on TTL (3.3 volt level acepped) level used for external control (automated test lines) and a USB connection to PC.
The P900 need a least USB 2.0 high speed connection (480 Mhz). Sample rate 96 or 192 KHz.

The software is arranged in four modes, an operator mode, a technician mode, a global set-up mode, and a utility mode, which all are protected by passwords.

The operator mode is for day-to-day production testing of parameters aready set-up in the technician mode. This mode is specially designed for non skilled personnel or for fully automated operations.

In the technician mode all parameters as frequency range, test level, reference curves limits, Rub & Buzz and THD filters etc. are customized to the specific requirements for each individual test.

In the global set-up the graphical presentation, test control, paths for files, chain of tests, statistics etc. are defined in the global set-up the graphical presentation, test control, paths for files, chain of tests, statistics etc. are defined.

For post-processing and manipulation of stored data there are a number of Utility functions as Export and Import of data, Statistical analysis and graphical display of batch data etc. The statistical analysis including calculation of various numbers of standard deviation and average curves to determine the test limits. The analysis is able to find a best matched measured unit against the average or another unit.

P900 can do following test parameters: 

Frequency response against upper / lower limits Sensitivity against upper / lower limits with move option  Impedance against upper / lower limits 
Frequency response against 2. upper / 2. lower limits  Sensitivity test point 1  Phase
Frequency response against 3. upper / 3. lower limits  Sensitivity test point 2  Qms 
Average of Frequency  Sensitivity test point 3  Qts  
Average of Frequency in groups  Sensitivity test point 4  F (Fres./Q)  
Average1 of sensitivity point 1-5  Sensitivity test point 5  Re
Average2 of sensitivity point 1-5  Rub & Buzz channel B against upper / lower limits  Voice Coil offset, BL
Polarity  Rub & Buzz channel D against upper / lower limits  EBP  
Slope of frequency  THD  T/S parameters
Current Distortion Ambient Noise Control Resonance   
BL-test Hi-2 test 2. Resonance test  
R-23 Harmonic ratio test  => 92 different display / test / modify curves  => 27 different test


Basic specifications:

Analyzing channels:

4 primary, 7 secondary

Test points:          

10 - 500

Sweep frequency:

5 Hz – 30 KHz

Sweep time:         

0.1 – 32 sec.



Filter frequency range:

5 Hz – 45 KHz

Filter types:


Detector modes:

Lin, Log & Spl

A/D converter:

4 x 24 bit

D/A converter:

4 x 24 bit

Input level:

3.16 mV – 10 V

Input modules:


Input multiplex:

Input to Ch. A, B & D

Input types:

XLR, Lemo, CCP

Microphone PSU:

200, 28 & 48 Volt

Microphone CCP:

4 mA

I/O functions:

4 inputs, 8 outputs

I/O level

TTL, 5 – 3.3 volt accepted

Power Amplifier:

1x14 Volt rms, 120 VA

System multiplex:

System 1, System 2


A & B (multiplexed)

PC connection:


Backplane Jack output

Output for external PA

Sample rate:

96000 – 192000 Hz

Backplane Jack monitor

Output monitor option

Backplane Jack Input

Input for external R-sense