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We've introduced our HP series to satisfy the needs of customers with larger rooms and those who want greater bass impact. Our HP subs offer two advantages when compared to our other subs. The first is 2 dB higher output. At bass frequencies, every 6 to 10 dB increase sounds twice as loud so the 2 dB increase with our HP series will sound around one third louder. The second benefit is an increase in perceived authority and impact. When a subwoofer amplifier reaches its limits, clipping occurs. This tends to reduce the dynamics and authority of the sound. Our HP subs can play cleanly where our other subs are operating at their limits. The difference is felt as much as it is heard.
There are other "brute force" subs on the market, but what our HP series achieve is a combination of brute force and finesse. Now the articulate and dynamic bass that our other subs have become known for is available with greater punch.
Direct Servo Technology
All of our subwoofers use our patented Direct Servo technology, providing high end performance at an affordable price. It allows us to use lighter and more efficient drivers and still achieve deep bass without using excessive amounts of power. The servo reduces memory effects, counteracts thermal compression and various forms of driver non linearities. Unlike many other non-servo subs which exhibit two-mode bass: either with too much bass when volume is up or with too little or no bass when the volume is down, our higher resolution subwoofers allow customers to listen at lower level and yet able to hear details in the bass in a wide range of volume level. In other words, the bass is simply more natural instead of constantly drawing our attention that we have a subwoofer in the system.
You can read about Direct Servo in more detail in our technology section.
H600XLR3 Amplifier and DS1510 Driver
F15HP now uses our new high power H600XLR3 servo amplifier and DS1510 driver. DS1510 features anodized aluminum cone, a 3" voice coil, and 200 oz magnet. Its linear excursion range has increased to +/- 20mm (from +/-15mm of DS1502). The entire subwoofer is 12lbs heavier.
The quickguide of the H600XLR3 amplifier for sealed subs can be found here . H600XLR3 amps do not have high pass filter RCA output, nor speaker level inputs. The response curves with various extension frequency/damping combinations of both amplifiers can be found in our EQ page. The other amplifier options and their quickguide can be found here: H600PEQ3.
Features & Options
Product features include:
All our subwoofers feature our Direct Servo technology, which is our secret to achieving tight and accurate bass. The benefits are far more than simply achieving low distortion.
Learn more in our technology articles
15" black anodized aluminum high excursion driver
DS1510 Driver features include:
Compared to our standard range of drivers, our DS1510 has a 3" voice coil which has a high thermal power handling and features lower power compression. While designed primarily for their sound quality, these custom designed drivers are also stylish in appearance with a anodized aluminum cone and rubber surround. Unfortunately, it's not possible to judge the accuracy of a driver by observing its appearance. There are other drivers on the market which in fact look quite similar, and it's tempting to think that they are comparable. Many of them are inferior in performance due to a heavy moving mass, the absence of shorting rings, wider gaps around the voice coil and high inductance which limits the useable high frequency cut off point. Many aren't suitable for a crossover point higher than 50 Hz. This is very limiting when one considers the large number of home theatre speakers which perform better when relieved of bass duties.
Our enclosures are very solid and well braced to minimize any cabinet resonances or coloration. The baffle into which the driver is mounted is double thickness.
We also provide a range of finishes.
All of our subwoofers feature unique bass extension controls which are not normally provided on subwoofers. This enables the user to customize the output and extension to achieve the best compromise in any room. Most subwoofers neglect to provide bass extension control, and the result is that dynamic headroom is compromised.
|The bass extension controls enable the user to customize the frequency response of the low end. The controls customize a high pass filter, which attenuates frequencies below a given frequency. If set to 14 Hz, bass below this point will be filtered. The damping control determines the slope of roll-off and the amount of time domain ringing. High damping provides the least amount of time domain ringing and the most gradual roll-off curve. Low damping provides the steepest roll-off at the low end at the expense of added time domain ringing. The combination of 28hz and low damping is recommended for maximum SPL ouptut for all of our sealed subwoofers.|
To suit different setups, we provide a 12 db and 24 db/octave crossover. If you are using an AVR, then we recommend "AVR/12" (or EXT/12 in older amps). If you are still using stereo receiver or conventional pre/power amp setup, then we recommend the 80hz/24 db/octave setting. To understand more about how to correctly integrate your subwoofer, read our phase alignment article.
Further details on the various controls and settings included are available on our amplifier page
For professional use, a balanced input version is available. The outputs allow multiple subwoofers to be connected. Simply daisy chain the connections, running output from the first (master) subwoofer to the input of the next.
For home use, balanced connections are not normally required. However, for those using studio processors and EQ units with balanced outputs, this option may be more convenient. If connection to a source with RCA connectors as found on my home audio equipment, an adaptor may be used. In this case it should be noted that the connection can no longer be considered balanced.
Shown above is XLR2 option. Slave subwoofer units each have their own phase and PEQ adjustment, allowing for placement apart from each other. All other controls will use the same settings as the master sub. Therefore you can adjust the gain on the first and it will control the gain on all the others. The servo will still function normally, correcting any non linearities in each individual subwoofer. We also have XLR3 options with two XLR inputs and no XLR output.
For more information, including charts showing response with different settings, view our amplifier page
Our PEQ version comes with a few extra options which aren't provided on our standard amplifier. First, there is one band of parametric EQ with adjustable frequency, gain and bandwidth. This means you can not only control the boost or cut, but also the width of the filter.
Additional bass management options are also provided. A switch allows the user to select a 12 or 24 db/octave crossover slope setup option. Where the higher slope (24db/octave) is selected, the amplifier uses a variable 12db/octave filter in addition to a fixed 12db/octave filter. One can choose with a switch the corner frequency of the fixed filter as either 50 or 80 Hz, which will suit most situations. The variable filter can be used for fine tuning.
We use high quality high excursion drivers which make it possible to achieve high output in a relatively compact enclosure. Only with Direct Servo is it possible to achieve such deep bass extension, high output and very high damping simultaneously. The effective system Q is 0.3. A lower Q factor represents a higher level of damping, indicating control of the cone. A typical subwoofer has a Q of 0.707 and some achieve a Q as low as 0.5. The penalty is that the box is larger and the output is lower in order to achieve lower Q, but Direct Servo can achieve much lower Q without sacrificing output and making the box bigger.
When more output than one subwoofers can provide is desired, it may be tempting to look for a higher output option. Our subwoofers represent what we consider to be the output limit for an affordable and accurate subwoofer. It's possible to get higher output with one subwoofer, but not without significant compromise and additional cost. We suggest multiple subwoofers as a much better option. A side benefit is that this can also improve the integration with the acoustics of each particular room.
The bass extension controls allow the user to customize the deep bass extension and the rumble filter to control cone excursion. For high SPL, one can set a higher cut off. For music one may prefer a lower cut off. Changing the settings can also result in a better integration with the acoustic gain of the room.
|Driver||DS1510 15" high excursion with custom sensing coil|
|Driver materials||Black anodized aluminum with rubber surround|
|Cast aluminum basket|
|Aluminum flux de-modulation shorting rings|
|Amplifier||600 RMS class H patented servo controlled|
|Dimensions||19"(W) x 19 " (H )x 20 "(D) - (21-1/2" D with grille)|
|Shipping Weight||108 lbs|
|Frequency Response||14 - 200 Hz (0db/-2db) with LFE inputs|
|10 - 250Hz (+/-3db) with LFE inputs|
|14 - 90 Hz (-2 dB @ 14 Hz) with LINE IN inputs|
|Crossover slope||Selectable 12 or 24 dB / octave (PEQ and XLR versions)|
|Crossover range (Low pass)||25 - 100Hz|
|Rumble Filter (High pass )||20 Hz 18 dB / octave|
|Phase response||90 degrees phase shift at 20 Hz (measuring mic has 18 degrees shift)|
|Phase adjustment||0 - 180 degrees continuously variable|
|Bass damping factor settings||high (Q=0.5), med (Q=0.7), and low (Q=1.1)|
|Finishes||Available in black oak and black matte vinyl|
|Warranty||5 years warranty on driver and 3 years on electronics|
|45 day satisfaction guarantee|
A quick glance at our frequency response plot will reveal that our subwoofers do exactly what we claim. In the chart below, with bass extension controls set to 14 Hz, the response is 3 db down at 14 Hz. The response is flat and extended.
Fig 1.0 - F15HP Frequency response chart - LINE-IN 14hz high damping
The frequency response with LFE input is shown in Figure 1.1.
Fig 1.1 - F15HP Frequency response chart - LFE-IN 14hz high damping
Looking at the frequency response you will notice that this is not a one note boom box designed to impress with exaggerated bass. Unlike conventional subwoofers, the frequency response remains flat at all output levels until the output limits have been reached.
With many subwoofers, it is difficult to get a correct and seamless integration with the main speakers because the amplifier settings are often very different to the measured response. You may set the crossover point to 80 Hz, but the actual crossover point may be anywhere between 60 and 100 Hz!
With our subwoofers the upper and lower -3 dB points are a very close match to the settings selected. If you set bass extension to 14 Hz, that is exactly what you will get. All this is possible because Direct Servo ensures a stable and flat response.
Another aspect of getting a correct integration is phase alignment. We have written a guide on how to achieve a phase aligned subwoofer. More
These are some of the finest subwoofers ever manufactured and the difference in sound quality between these subwoofers and the typical big-box ported subwoofer is surprising. You will hear the difference the very first time you listen and as so many have said, you will never go back to a non-servo subwoofer.