Yorkville Sound Introduction, Configuration, Input Level Switch, 2. LS801P Level Control

Introduction

The LS801P is a premium quality integrated subwoofer and power amplifier. Created as an easy-to-setup addition to any P.A., the LS801P will extend the bass of a typical sound system with the least amount of complication. The LS801P has been intended to operate primarily with line level signals (with the option to accept Speaker Level signals).

Configuration

The LS801P may be used in several different configurations. The basic system is a single LS801P used for each full range enclosure or multiple LS801Ps along with individual full range enclosures. The LS801P accepts, and combines, the signals from separate line level (e.g. Left and Right) sources. Using the Mono Blend XLR input combines the second line level signal properly to drive the internal speakers and does not affect the stereo separation of the full range enclosures. When used in a setup where only one signal is provided to a speaker, such as a mono system or stereo with more than one LS801P, you can use any of the Link jacks.

1. Input Level Switch

The Input Level switch is provided to switch the Input Level between line level and speaker level. This switch should be set to speaker level when the LS801P is fed from the output of an amplifier or ‘powered’ mixer. Do not plug in two Speaker Level sources to one LS801P. The line level position is for use when the LS801P is fed a signal directly from a processor, electronic crossover or the output of an ‘unpowered’ mixer. When using the line level mode, the use of balanced (Tip, Ring, Sleeve) and/or XLR cables will reduce the unit’s sensitivity to hum and buzz.

2. LS801P Level Control

The LS801P Level control adjusts the amount of bass added to the sound system by the LS801P. This adjusts for the relative sensitivity of the companion full range speakers and the desired system frequency response. This control should be set by listening while operating at a medium level and then not changed. It is not possible to set this control properly at high levels since the limiter is determining the output level.

A setting of 0 dB on the LS801P Level control is the correct starting point when setting up a sound system. From there, adjustments can be made for the best sound. The 0 dB mark refers to the setting that will give full power when the line input is used and the input signal is at a level of +4 dBV.

3. Shape Control

The Shape control enables tweaking of the most effective sub frequency, 50 Hz. You can boost or cut the equalization of the enclosure (50Hz) by a range of 6 dB (+ 3dB / -3dB).

Note: In High SPL situations a louder volume can be achieved by not using the Shape control in its full clockwise position.

4. HF Rolloff Frequency Control

The HF Rolloff Frequency control varies the frequency at which the LS801P rolls off the high frequencies. This provides part of a crossover function. This crossover function also combines with the natural low frequency rolloff inherent of the full range enclosure (when the LS801P is not used with an élite processor). An elite processor may be used to provide the LF rolloff of the full range loudspeaker. Ideally the LS801P would then be wired ahead of this processor. In this case the LS801P HF rolloff should match the LF crossover point of the elite processor. The elite processor should be set in the mode intended for use with a subwoofer. An elite processor may be used ahead of the LS801P in which case the LS801P HF rolloff should be set to maximum.

5. LINK Jacks

The Link jacks are set up to make it easy to hook up your LS801P to any audio system with a minimum of hassles. SInce all of the Link

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