grapefruit into the vent and push the ball upwards, into the woofer cavity. Do this in both speakers, and if one handful is not sufficient to reduce the overall bass level, continue to place Dacron balls upwards into the woofer cavity.

B). If the frequency range between 20-30Hz sounds too powerful in your particular room, simply place a large handful of the Dacron in each vent tube; this will lower the efficiency of the vent tuning. If the bass is still too loud, place another handful in each vent.

If the low frequency range has come into proper balance, stop there. If you change locations, you can always remove the balls of Dacron by reaching into the vent.

BASS RESPONSE TUNING FOR TUBE AMPLIFIERS:

Since tube amplifiers have “air and liquidity” in the mid and treble ranges, many audiophiles use them. However, the saturation, back EMF, and transient response delays caused by the output transformers may cause sluggish bass response which can be heard when using any speaker that has response below 30Hz. The deep bass can be tightened considerably by the addition of several handfuls of Dacron in each vent which is then pushed into the enclosure. It is possible to tighten the VR-4SR Mk2's bass response to a degree not heard with other speaker systems, so don’t be afraid to experiment!

Try using solid core wire on the woofer modules when using tube amplifiers if you are trying to tighten up the bass, since stranded wire will emphasize the bass fullness you are trying to equalize. However, using silver cables will also tighten the bass.

The best possible bass response is obtained from high current solid state amplifiers, making bi- amping the ideal choice for the critical audiophile who wishes to have the best sound in every part of the frequency range. See the section above regarding bi-amping.

LACK OF APPARENT BASS:

In some rooms, especially those with “soft” walls such as wallboard over studs, open floor plans, and rooms with poor dimensional ratios, it is possible to “lose” bass response. Also, when sitting in a “null,” it is possible to perceive, incorrectly, that there is a lack of bass power in the speaker system itself. In these cases, it will be necessary to move either the speaker position or the listening position in order to optimize the response. By playing a recording with a repeating bass line, try walking around the room until you find the places where there is apparent bass. It will be necessary, in some cases, to reposition the speakers in order to allow the room to boost the bass by using the natural “gain” of the boundary reflections. Simply move the speakers closer to the rear wall or side wall in small increments until the bass sounds right.

ANCILLARY EQUIPMENT

The VR-4SR Mk2 is far more transparent than any other competing design, including electrostatics. (If you don’t believe this, put any electrostatic next to the VR-4SR Mk2 and use a transparent switching device such as a copper knife switch to directly compare the sound of the VR to the electrostatic. Make sure that you use the same channel, since the electronics may have a large difference in sound between the channels, and the same brand of cable. It may be necessary to use a

13

Page 12 Page 14
Page 13
Image 13
Von Schweikert Audio VR-4SR MK2 manual Bass Response Tuning for Tube Amplifiers, Lack of Apparent Bass, Ancillary Equipment
Page 12 Page 14

VR-4SR MK2 specifications

Von Schweikert Audio is known for pushing the envelope in high-fidelity audio design, and the VR-4SR MK2 stands as a testament to this ambition. This floor-standing speaker model blends cutting-edge technology with exceptional craftsmanship, making it a standout choice for audiophiles seeking rich, immersive sound.

The VR-4SR MK2 is engineered with a multi-driver configuration, featuring a dedicated ribbon tweeter and dual 7-inch woofers. This combination is designed to provide an expansive soundstage while maintaining precise imaging. The ribbon tweeter is a hallmark of Von Schweikert's design philosophy, allowing for extended high-frequency response and a level of detail that many speakers struggle to achieve. It delivers clear and airy treble, ensuring that high notes resonate without harshness, making it perfect for both classical and contemporary music.

One of the key technologies utilized in the VR-4SR MK2 is the company's proprietary RCM (Resonant Chassis Management) system. This technology minimizes the resonance that can color sound reproduction, resulting in a cleaner and more accurate audio signal. The cabinet is also engineered to reduce standing waves, contributing to a tighter bass response and enhancing overall clarity.

In terms of build quality, the VR-4SR MK2 features a beautifully crafted enclosure that is visually appealing and functionally effective. With a sleek design available in various finishes, it can complement modern and traditional décors alike. Its robust construction not only enhances the aesthetic but also ensures durability over time.

The speaker’s sensitivity rating of 89 dB makes it relatively easy to drive, meaning it can be paired with a wide range of amplifiers without compromising performance. Whether you're using a high-powered amplifier or a more modestly powered unit, the VR-4SR MK2 maintains consistent performance across different playback levels.

Moreover, flexibility is a crucial aspect of the VR-4SR MK2. Its rear-firing ports allow for tailoring the bass response to fit different room acoustics, making it adaptable in various setups. This helps users achieve optimal sound reproduction regardless of their listening environment.

In conclusion, the Von Schweikert Audio VR-4SR MK2 encapsulates the perfect blend of innovative technology and meticulous craftsmanship. With its dynamic range, impressive imaging, and aesthetic appeal, it remains a worthy contender in the realm of high-end audio speakers, promising a captivating listening experience for music enthusiasts.
Top Page Image Contents