SC8
Description
Źródło: www.codaaudio.com
SENSOR CONTROLLED SUBWOOFER WITH VERSATILE PATTERN CONTROL
FEATURES:
- 4 x Coda Audio 18” extreme high output subwoofer
- Velocity sensors for feedback loop control
- Extended frequency range down to 25 Hz
- Ultra low distortion
- Fast transient response, the upper and the ultra low frequency are time aligned
- Cardio, Hypercardio or Omni directional mode
- Optional rigging hardware for flown or ground-stacked arrays
- Reduced truck space for reduced labor and transport costs
SC8 KEY TECHNOLOGIES:
- The advanced design aligns several new technologies for outstanding performance.
- Feedback loop control – ultra low distortion, very extended and controlled response
- Versatile pattern control – Cardio or Omni mode in one cabinet
- Long excursion drivers with integrated velocity sensor
The Feedback loop controlled subwoofer has clear advantages over conventional amplifier / subwoofer solutions when it comes to sonic performance, output and size.
The SC8 subwoofer
Description: Sensor controlled subwoofer with versatile directional characteristic (Cardio or Omni) incorporating four 18” long excursion woofers.
The SC8 subwoofer provides perfectly flat response down to 25 Hz and very high output and low distortion.
What is Velocity Feedback Loop Comparator?
The new designed 18” driver includes a built in “velocity sensor” that measure precisely the movement of the voice coil.
The “velocity sensor” sends information to the Comparator about velocity, excursion and speed of the voice coil (using XLR cable).
The comparator compares the original input signal to the movement measurement from the “velocity sensor” and adjusts the amplifier driving voltage and/or current so that the diaphragm moves the way it should move. This compensates in real time for the non linearity of the speaker/cabinet.
MAIN ADVANTAGES OF THE ACTIVE FEEDBACK LOOP COMPARATOR:
Total Harmonic Distortion is reduced significantly
THD drops 80 - 90% at low frequency (about 20dB less distortion at 20Hz compared to the same driver without velocity sensor).
Extended Frequency response
Using this technology the frequency response of the speaker can be modified without equalizer. The comparator is adjusted to compensate not only the loudspeaker nonlinearities, but its frequency response as well. The flat frequency response goes down to 25 Hz (-3 dB). No high pass filters or equalizers are required.
Reduced group delay
This is a big issue that is most often overlooked in conventional designs. The feedback comparator technology offer great advantages in the time domain. In fact the upper bass and the very low frequency are time aligned which means they are reproduced at the same time resulting in extremely accurate and musical bass reproduction.
Reduced truck space
The sealed enclosure ensures best output to size ratio reducing up to 50% the cabinet volume.
Therefore the SC8 - 4 x 18” cabinet has similar size as a conventional double 18” subwoofer. (For example the 18” drivers in the SC8 are working in 93 liter each while a port loaded cabinet needs 150 to 180 liter net volume and the port adds additional around 30 liter more for each driver).
TRANSDUCERS
The SC8 is equipped with four extremely long excursion 18” neodymium ultra low distortion woofers with integrated velocity sensor that measure, compare and control cone movements. The neodymium motor delivers extreme high magnetic flux for increased efficiency. The 4” voice coil is 50 mm high, ensuring ultra linear excursion of 40 mm / pp at consistent magnetic force. State of the art carbon-fiber cone ensure maximum stiffness and low moving mass. Three aluminum shorting rings reduce inter-modulation distortion; minimize induction variation while reducing thermal compression. This design reduces dramatically the distortion of a typical subwoofer at longer excursion levels, and improves the overall sound quality and performance characteristics of the cabinet. The sensor is in fact an additional voice coil connected to the loudspeakers voice coil in a high precision, magnetically shielded system.
ELECTRONICS AND CABLING
C2 - 19” Comparator
The C2 Comparator is the active electronic loop control unit for the SC8 subwoofer. The unit includes two balanced audio inputs and two outputs as well as two sensor control loops connected to a 5-pol Neutrik XLR input. The Comparator’s electronic circuit loop measures the voice coil excursion of the SC8 subwoofer and corrects the signal, significantly decreasing distortion. The unit is set for flat frequency response down to 25 Hz (-3 dB).
Speaker connection
The SC8 subwoofer includes double 4-pol Neurik Speakon inputs and one 5-pol Neutrik XLR for the two sensor control outputs.
The cabinet should be connected to the C2 Comparator and a stereo amplifier (2 x 3000 W @ 8 Ohm) using a hybrid cable (two loudspeaker cable + two symmetric control signals in one cable)
DIRECTIVITY
The SC8 can be configured for different polar patterns:
Cardio / Hypercardio or Omni directional when the cabinet is rotated at 90°.
Cardioid Mode
Omni directional Mode
RIGGING HARDWARE
The SC8 and can be ordered with or without flying hardware. The SC8F (SC8 including flying hardware) is compatible to AIRLINE LA12 Frame for easy flying or ground stacking in various combinations.
APPLICATION
Primarily designed for integration into AIRLINE LA12 line arrays, the SC8 is also suited for variety of applications in touring and installations where high precision, deep bass with directivity control is needed.