8S2 - Speaker KRK - Free user manual and instructions

USER MANUAL 8S2 KRK

IMPORTANT: Before starting up the subwoofer, be sure all connections are made, all fader and controls should be set at their minimum levels, and all other equipment should be powered prior to powering up your KRK subwoofer. If you are connecting the subwoofer outputs to your monitors, turn monitor power on after the subwoofer. KRK subwoofers include a built-in crossover and amplifier so you only need the appropriate cables to connect one into your existing system. First, you’ll need to connect a pair of cables from the stereo outputs of your audio source to the left and right RCA, XLR or ¼” TRS input jacks on the subwoofer. Next, hook the corresponding output jacks on the subwoofer to the inputs of your studio monitors. NOTE: If you are using the RCA inputs but either the XLR or TRS outputs you may need to adjust the INPUT SENSITIVITY to HIGH if you are not getting sufficient audio signal. If you chose to use an external crossover with your KRK subwoofer, run your audio signal to the crossover inputs. Next, connect the low frequency output to the KRK subwoofer and the high and/or mid frequency output to your studio monitors. You will need to adjust levels on both your subwoofer and studio monitors to make sure the levels match.

Subwoofer Hook Up with Active Monitors If you are using active (powered) monitors, use an XLR or ¼” cable to connect the output of the subwoofer directly to the input of the monitor. The output marked "Left" should go to your left monitor, and the output marked "Right" should go to your right monitor.

Subwoofer Hook Up with Passive Monitors If you are using passive (non-powered) monitors, use an XLR or ¼” cable to connect the output of the subwoofer directly to the input of the monitor’s external power amplifier, and then connect the power amplifier speaker output to the monitors. NOTE: DO NOT connect the speaker output of the monitor’s external amplifier to the input of the subwoofer. This will cause permanent damage.

8S/10S/12SSYSTEMCONTROLS

Before installing and connecting your KRK studio subwoofer, please read the description for each System Control so you are familiar with their use.

[3]INPUTSENSITIVITY TheINPUTSENSITIVITYcontrolonyourKRK8s/10s/12sstudiosubwooferhastwooptions:NOMINALandHIGH.These settingsaredesignedtocompensateforthedifferencesinaudiosourcesthatcanbeconnectedtoan8s/10s/12sstudio subwoofer.TheNOMINALsettingworkswellwithmoststudiorecordingapplicationswhiletheHIGHsettingisusefulfor connectingtoconsumerelectronicslikeastereoreceiver.

The Basics of Subwoofer Placement It is widely accepted that frequencies below 100Hz are generally omnidirectional, which is to say it is almost impossible to detect where they are originating from in any given space. What is less commonly known is that the geometry of objects within a room can greatly affect how the subwoofer will react. Here are some suggestions of things to keep in mind for proper subwoofer placement. ‐ Keep the subwoofer as near as is practical to the satellite speakers. This will reduce possible interference from time alignment issues. ‐ Keep the subwoofer away from corners and walls if possible. While the effects of proximity to solid surfaces can be overcome, it is often best to avoid those situations completely if possible. ‐ One of the easiest ways to determine the ideal placement of a subwoofer is to start with the subwoofer in the main listening position and move around the room. Where the bass sounds smoothest, or even loudest, is usually a good spot to start with placing the subwoofer. ‐ Once you have the subwoofer in a place where it makes sense, sit in the main listening position and listen for the bass response. Move the subwoofer around by about a foot at a time until you find the place where the low end sounds the smoothest.

Subwoofer volume and phase alignment The next step is to configure the subwoofer volume and phase settings for your system. Here are some step-by-step instructions for how to do this. ‐ Start with your subwoofer crossover on its lowest setting ‐ Next, route a band-limited pink noise tone through the system including the satellite speakers. 500Hz-1kHz will allow you to set the volume of the satellites without exciting the subwoofer. Using an SPL meter (or iPhone app), set the overall volume so that the level is something comfortable, around 85dB should suffice. ‐ Run another band-limited pink noise tone of 35Hz-70Hz through the system and set the volume on the sub to where it’s hitting 85dB on the meter as well. ‐ Set the low pass crossover to the highest setting. Run a band-limited pink noise tone from 60Hz-120Hz and from the listening position, determine if 0 or 180 on the phase switch is loudest. Leave the switch in the loudest position. ‐ To further check your sub is in-phase, run a 70Hz test tone through the system. Flip the phase switch to either 180 or 0, whatever the opposite of what it was in the previous step, and adjust the variable phase until the bass level is quietest. Then flip the phase switch back to 0. ‐ Finally, listen to some music you are familiar with and set the crossover level to a place where you only hear low end and no mid frequencies coming from the sub. A commonly accepted practice is to double the lowest frequency that the satellite speakers are rated for and use that as the crossover frequency.

If there is no power, check to see if... Check to see if the power cord is plugged into both the IEC socket on the rear panel of the active speaker and into the AC mains. Verify that the AC mains are active by using an approved AC tester or simply connect a lamp with working light bulb. In some cases, the AC mains may be controlled by a light switch or power strip suppressor that may not be in the ‘on’ position. Verify that the power switch on the active speaker is in the ‘on’ position. Check to see if the power light is illuminated. The power light can often to be found on the front panel of the monitors and the rear panel of the subwoofers. If the power light is not illuminated, turn the power switch OFF and check the A/C mains fuse(s). The fuse is located directly below the power receptacle. Please see the user guide that came with your monitor for more information. NEVER USE A LARGER AMPERAGE FUSE THAN IS SPECIFIED! After the fuse has been checked and replaced, turn the power switch back on. The power light should illuminate. Check to see if a fuse change was needed. If you power the monitor back up and the fuse blows again, the monitor needs to be returned to the dealer or distributor where you purchased it or to KRK for servicing. If you can’t hear certain sounds... Repeat steps in the previous troubleshooting section above before continuing to the next steps. Check to see if all other audio devices using the same AC outlet are still operating. Check to see if the audio source cable is plugged into both the source output and the monitor input. Check to see if the Volume knob is turned up fully clockwise. Check to see if the signal source (E.g. mixing console, work station, CD player, etc.) is turned up to a level that can properly send a signal to the monitors. Check to see if the audio source is in mono or stereo, or information in the mix may also be panned differently which will result in differing cancellation. Audio heard in stereo and not heard in mono may be a result of phase cancellation due to long delays between left and right channels or polarity inversion. Avoid polarity inversion by using matching cables and use one type of input connection only. Do not use an XLR/TRS balanced input on one monitor and an RCA unbalanced input on the second monitor. Check to see if one of the monitors is working. Exchange the audio input cable from the non-working monitor to the working unit. This will determine whether it's really the monitor, a faulty cable, or some other glitch in the audio chain. If the monitor is still not responding, it should be returned to the dealer where you purchased it or to KRK for servicing. If the subwoofer suddenly stops working... Turn the subwoofer level down or off. Repeat steps in the troubleshooting sections above before continuing to the next steps. Carefully check to see if the amplifier's back plate is hot! If the monitor has been running at highest power output for an extended period of time, it could be that the unit has become overheated and the protection circuitry has shut the system down momentarily. The monitor provides maximum circuitry protection against AC power surges, amplifier overdrive, and overheating of the amplifiers. Turn the monitor off then wait 30 minutes to allow the back plate to cool down. Turn the power switch back on. Increase the volume to check for normal operation. If the monitor is still not responding, it should be returned to the dealer where you purchased it or to KRK for servicing.The sound quality changes... Repeat steps in the previous troubleshooting section above before continuing to the next steps. It is possible that the change in sound quality is due to changes in the room or listening position. Low frequencies (bass response) can be increased or reduced by changes such as furniture and/or large equipment placement. Try moving the speakers or listening area a different position or return the room back to where the sound quality was acceptable. A reduction in bass frequencies may be a result of polarity inversion between the left and right channels or long delays between the left and right channels. Information in the mix may also be panned differently which will result in differing cancellation. Check the audio source and verify if one channel is polarity flipped or long delays are being used. Avoid polarity inversion by using matching cables and use one type of input connection only. Do not use an XLR/TRS balanced input on one monitor and an RCA unbalanced input on the second monitor. Disconnect the signal cable at the input of the monitor and adjust the volume control to the minimum setting. With power on, place your ear close to each driver (tweeter/woofer) and listen for noise (i.e., a slight hiss or hum) while slowing increasing the volume from the minimum setting. It is important that the volume is slowly adjusted from minimum setting to avoid any spike in sound levels while the ear is close to the driver (tweeter & woofer). If there's absolutely no sound whatever, it could be that the driver is at fault. It's also possible that the problem lies somewhere in the electronics. Play some non-distorted source material at a low volume. Carefully cover the woofer (to block the sound) without touching the diaphragm. Is the woofer producing a clean sound? If there is not a clear tonal quality or any sound at all then the woofer probably needs to be replaced. Verify the source signal level has not changed or source has changed. This can be tested by connecting the source headphone outputs to a set of headphones and verifying the sound is not loud or distorted. If the sound is poor at the source (preamp stage) than it is not the active speakers. Once you have a better idea of what may be at fault then contact our service department. They will help you determine the best solution to correct your issue. The subwoofer hisses, hums or makes other loud noises... Make sure that the power cord is plugged snugly into the IEC socket on the rear of the monitor. Check the connections between the signal source and the monitor. Make sure all connections are secure and that the cable is not damaged or wired incorrectly. If you are using an unbalanced output to balanced cable conversion, make sure it is correct. The shield is connected to the unbalanced ground of the source and pins 1 and 3 of the XLR (or the sleeve and ring on the ¼” TRS jack). All audio equipment should use the same ground point. Check all other devices using the same AC output in the building like light dimmers, neon signs, TV screens, and computer monitors. These devices should not be using the same circuit. Verify that the signal cables are not routed near AC power lines or other EMI sources (including wall power adapters and computers). Excessive hiss may be a result of an incorrect gain setting before the speaker connection. Verify the source signal is not noisy before connecting the monitors. This can be tested by connecting the signal source headphone outputs to a set of headphones.WARRANTY

GibsonProAudioWarranty IfatanytimeyourGibsonProAudioproduct(whichincludesStanton,KRK,orCerwinVega!brands)malfunctionsasaresultoffaulty materials or workmanship, Gibson Pro Audio or one of Gibson Pro Audio’s Authorized Service Centers in the US will repair the defect(s)orreplacethemerchandise,asitdeemsappropriateatitssolediscretion. WarrantyPeriod(fromdateofPurchaseaslistedontheBillofSale):

Stanton One(1)yearforallStantonproducts.

KRK Three(3)yearsfromallstudiomonitors. One(1)yearallheadphones,computeraudiodevices,includingroomcorrectiondevices.

WarrantyServiceoutsidetheUnitedStates: To initiate a warranty repair, please contact the Authorized Gibson Pro Audio distributor from whom you purchased your merchandiseandfollowthedistributor’sreturn/warrantypolicy.