Rythmik Audio F12G

The standard amplifier is A370PEQ (370WRMS PEQ) with LINE in and HPF output. It has no LFE in. The response curves with various extension frequency/damping combinations can be found in our EQ page

The sub comes with screw-in rubber feet. Spike feet are available as add-on for $25 with no exta shipping cost. Price includes shipping to 48 US continental states only. Shipping to other region or country should inquire us for actual cost. Due to tariff increase, we have reduced the mult-sub discount to 5%.

Our speaker level inputs are only compatible with power amplifiers having single ended outputs with black lead output labelled as “COM”, “GND”, or “Ground”. Wyre4sound power amplifiers and others with differential outputs are not compatible. These amps need an XLR type 3-wire (one positive, one negative, and one ground) for safe operation.

Using Y-splitter on input connection increases the subwoofer gain by 6db. High efficiency horn speakers (105db/Wm and above) may require custom modification for “gain matching” of the volume control knob (not to be mistaken as sub not keeping up with horn speakers) when this connection method is not option (eg, single sub acception both L and R inputs). To summarize, customers who need to consider higher gain are those with all these conditions: 1) has high efficiency horn speakers, 2) has no AVR or pre-processor, and 3) cannot use Y-splitter to connect to multiple inputs on a sub to increase gain by 6db. Please select “High gain” option in the order.

Efficiency of newer Klipsch horn speakers are over-rated by 6db and not an issue for gain matching. Please inquiry us when using our subs with horn speakers if you are not sure what to do.

The subwoofer for audiophiles
For audiophiles looking for uncompromising accuracy, our F12G subwoofer is the ultimate choice. It features our Direct Servo technology to ensure accuracy and definition. As an audiophile you appreciate that bass is the foundation of a satisfying music or home theatre experience. You also appreciate that there is more to a home theatre subwoofer than shaking the room, and that music can be far more satisfying with a subwoofer that can play deep.

What makes our subwoofers suitable for audiophiles? It’s not that they can plumb the depths with authority. There are already many subwoofers on the market which can do that. The difference is that they reproduce bass with a level of realism that is normally only associated with much more expensive high end full range loudspeakers.

What is the difference between F12 and F12G?

The main difference is the paper-based GR research driver.

Direct Servo Technology
You may have heard about other servo subwoofers which are generally well regarded for their accuracy. It is a well established technology, most often based around an accelerometer which measures cone movement. Our Direct Servo technology has significant advantages over other servo technologies. We use a sensing servo coil which acts like a microphone which compares the original signal to what the subwoofer is actually reproducing. The signal is then corrected instantly to compensate for any differences. Once you understand the concept, you may wonder like we do why anyone would make a subwoofer any other way.

All our subwoofers use our patented Direct Servo technology. The most significant benefit is that it provides high end performance at an affordable price. Conventional subwoofers require heavy drivers in order to achieve deep bass extension. Direct Servo allows the use of a lighter driver which is more efficient so that a very high powered amplifier is not necessary. At the same time, Direct Servo reduces detrimental memory effects which detracts from the realism of reproduction.

Some of the benefits of Direct Servo include:

Reduction of the effects of thermal compression are eliminated under normal operation
Higher efficiency allowing output which would normally require a more powerful amplifier
Deep bass extension can be achieved using a low mass driver with superior transient response
Mechanical and thermal memory effects are reduced, further improving transient response
The effective Q value is 0.3 resulting in much tighter and accurate bass than conventional designs
Dramatic reduction of the re-radiation of bass from inside the box
Many audiophiles aren’t aware of all of these issues, but we believe they are critical to the design of an accurate subwoofer. While it’s not necessary to understand them to enjoy accurate bass, for those who wish to understand how we do it, we have articles to describe our unique approach.

Weight: 34 kg
Color: Black Matte

The standard amplifier is A370PEQ (370WRMS PEQ) with LINE in and HPF output. It has no LFE in. The response curves with various extension frequency/damping combinations can be found in our EQ page

The sub comes with screw-in rubber feet. Spike feet are available as add-on for $25 with no exta shipping cost. Price includes shipping to 48 US continental states only. Shipping to other region or country should inquire us for actual cost. Due to tariff increase, we have reduced the mult-sub discount to 5%.

Our speaker level inputs are only compatible with power amplifiers having single ended outputs with black lead output labelled as “COM”, “GND”, or “Ground”. Wyre4sound power amplifiers and others with differential outputs are not compatible. These amps need an XLR type 3-wire (one positive, one negative, and one ground) for safe operation.

Using Y-splitter on input connection increases the subwoofer gain by 6db. High efficiency horn speakers (105db/Wm and above) may require custom modification for “gain matching” of the volume control knob (not to be mistaken as sub not keeping up with horn speakers) when this connection method is not option (eg, single sub acception both L and R inputs). To summarize, customers who need to consider higher gain are those with all these conditions: 1) has high efficiency horn speakers, 2) has no AVR or pre-processor, and 3) cannot use Y-splitter to connect to multiple inputs on a sub to increase gain by 6db. Please select “High gain” option in the order.

Efficiency of newer Klipsch horn speakers are over-rated by 6db and not an issue for gain matching. Please inquiry us when using our subs with horn speakers if you are not sure what to do.

The subwoofer for audiophiles
For audiophiles looking for uncompromising accuracy, our F12G subwoofer is the ultimate choice. It features our Direct Servo technology to ensure accuracy and definition. As an audiophile you appreciate that bass is the foundation of a satisfying music or home theatre experience. You also appreciate that there is more to a home theatre subwoofer than shaking the room, and that music can be far more satisfying with a subwoofer that can play deep.

What makes our subwoofers suitable for audiophiles? It’s not that they can plumb the depths with authority. There are already many subwoofers on the market which can do that. The difference is that they reproduce bass with a level of realism that is normally only associated with much more expensive high end full range loudspeakers.

What is the difference between F12 and F12G?

The main difference is the paper-based GR research driver.

Direct Servo Technology
You may have heard about other servo subwoofers which are generally well regarded for their accuracy. It is a well established technology, most often based around an accelerometer which measures cone movement. Our Direct Servo technology has significant advantages over other servo technologies. We use a sensing servo coil which acts like a microphone which compares the original signal to what the subwoofer is actually reproducing. The signal is then corrected instantly to compensate for any differences. Once you understand the concept, you may wonder like we do why anyone would make a subwoofer any other way.

All our subwoofers use our patented Direct Servo technology. The most significant benefit is that it provides high end performance at an affordable price. Conventional subwoofers require heavy drivers in order to achieve deep bass extension. Direct Servo allows the use of a lighter driver which is more efficient so that a very high powered amplifier is not necessary. At the same time, Direct Servo reduces detrimental memory effects which detracts from the realism of reproduction.

Some of the benefits of Direct Servo include:

Reduction of the effects of thermal compression are eliminated under normal operation
Higher efficiency allowing output which would normally require a more powerful amplifier
Deep bass extension can be achieved using a low mass driver with superior transient response
Mechanical and thermal memory effects are reduced, further improving transient response
The effective Q value is 0.3 resulting in much tighter and accurate bass than conventional designs
Dramatic reduction of the re-radiation of bass from inside the box
Many audiophiles aren’t aware of all of these issues, but we believe they are critical to the design of an accurate subwoofer. While it’s not necessary to understand them to enjoy accurate bass, for those who wish to understand how we do it, we have articles to describe our unique approach.

Weight: 34 kg
Color: Black Matte