We have a range of Direct Servo enabled amplifiers. These feature a servo board which has been designed specifically for the driver which will be used.
3 different versions- Standard amplifiers: for those who use bass management in their HT receivers
- PEQ amplifiers: includes one band of defeatable parametric EQ
- XLR amplifiers: balanced inputs and master control - multiple subs controlled from the settings on the master sub
Our A series amplifiers are class AB, and H series use class H. All amplifiers use toroidal transformers except A300 which use EI transformer. We no longer supply nonservo amplifiers as we are now exclusively servo subwoofer manufacturer. The information here is to provide an overview of the servo amplifiers used in our products.
All of our amplifiers have the same cut out dimensions so that they are interchangeable. The Servo version of these amplifiers are used in all of our finished subwoofers and custom installation kits. Here we list them for side-by-side comparison.
| Servo Model | A300 | A370-XLR2(up-coming) | A370-PEQ |
| Output Power (4ohms) | 300W RMS | 370W RMS | 370W RMS |
| Input Type | Speaker/RCA | RCA/Balanced | Speaker/RCA |
| Master control | NO | YES | NO |
| High Pass Filter Output | YES (RCA, both channels) | YES (XLR, one channel) | YES (RCA, both channels) |
| Parametric EQ | NO | YES | Defeatable one-band |
| Power amp inputs | MOSFETs | MOSFETs | MOSFETs |
| Setup for | HT receiver | w/ or wo/ HT receiver | w/ or wo/ HT receiver |
| Subwoofer LP roll-off | 12 dB | 12/24 dB selectable | 12/24 dB selectable |
| Power filter caps | 4x80V/6800uF | 4x100V/6800uF | 4x100V/6800uF |
| Warranty | 2yr | 2yr | 2yr |
| Control Layout |  |
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Click images to view full size
Download quick guides | A370PEQ | A370XLR | A300
High powered H Series
Please note: the layout of H series is identical to other models
Crossover note on all models
A300 amplifiers are designed for use with home theater (HT) receivers in default configuration. The users need to use the bass management on the receiver. The 12db/oct low pass filter on SE amplifiers is used as a fine tuning knob to adjust the overlap between the sub and the front speakers. For those who really need it for a non-HT setup, PEQ and XLR amplifiers have a 12db-24db/oct selectable low pass filter to use with or without an HT receiver. That switch is located with the other controls. The 24db/oct on them is implemented as 12db/oct adjustable via a knob plus a 12db/oct fixed at either 50hz or 80hz (two switch positions).
For international shipping, please check out order page. Currently these amplifiers are configured as servo only.
View Rythmik Audio Direct Servo enabled versions >
View GR Research DIrect Servo versions >