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RMC™ Room Mode Correction

User Guide

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Summary of Contents for Room Mode Correction

Page 1: ...RMC Room Mode Correction User Guide...

Page 2: ...pensation 7 Calibrating Your System 8 13 I LSR6328P System 8 13 Taking Measurements 8 9 Analyze Your Measurements 10 11 Adjusting The RMC System 12 13 II LSR6328P Systems with LSR6312SP Subwoofer 14 1...

Page 3: ...be bass shy because you will tend to overcom pensate for what may sound like too much bass in the program Response peaks due to room modes can be accurately removed by introducing a carefully tailored...

Page 4: ...er has a press and hold switch to incease battery longevity Full scale on the meter corresponds approximately to a sound pressure level of 86 dB The meter s scale covers a range of 16 dB the same as t...

Page 5: ...nd the frequency scale at the bottom Below the chart are areas for you to enter your collected data Frequency Hz Level dB and Width The 9 Volt Battery should be installed in the Sound Level Meter prio...

Page 6: ...e 5 show options for both stereo and surround setups Boundary surfaces create reflections from the loudspeakers that will to some extent inter fere with the direct sound from the loudspeaker to the li...

Page 7: ...n Figure 5 C How Close Should The Loudspeakers Be To The Listener Ideally the loudspeakers should be far enough away from the primary listening position so that normal head movements don t interfere w...

Page 8: ...our System out CD Player LSR6328P Volume Control Figure 6 Input Trim Active 4 dBu Input Sensitivity 8 dBu Input Sensitivity VLF Protect Off HF Level 1 dB 2 kHz 20 kHz HF Level 1 dB 2 kHz 20 kHz 3 0 dB...

Page 9: ...the chart paper for each warble tone Before each tone plays an announcer names the frequency of the tone You will note that the warble tone sequence begins at the highest frequency of 126 Hz progressi...

Page 10: ...ng position forward just a bit This may alleviate the dip somewhat Otherwise no equalization is required Example C This is a very common pattern you will see in fairly live small to moderate size spac...

Page 11: ...Two LF peaks In general you should equalize the peak that has the greater area between the curve and baseline You may wish to engage the boundary compensation to lower the level below 150 Hz and then...

Page 12: ...o adjust pull the tab at the top of the width template As shown in Figure 10b the tem plate is placed over the peak in a plotted curve and adjusted so that the shape of the template matches that of th...

Page 13: ...e values entered at the bottom of your measurement chart See Figure 11 Making these entries requires carefully counting the clicks If you make a mistake or have lost count turn the control to the full...

Page 14: ...of the LSR6312SP power up the unit and make sure the Bypass is not active See Figure 12 Ensure the RMC system on the LSR6328P units are active After the system is connected and levels have been calib...

Page 15: ...328P on page 8 5 Play Track 3 to determine if there are any meter overloads If there are reduce the signal level from the CD player to ensure that there will be no overloads If you do reduce the CD pl...

Page 16: ...5 126 Frequency Hz Level dB Width Figure 15 Figure 16 Two Pronounced Peaks Sharp Dip Adjacent to a Peak Two pronounced peaks Figure 15 shows response with a large peak at about 31 Hz and a lesser one...

Page 17: ...ried out equalization at that frequency or fairly close to it you may find that the overall response peak that you reduced in the subwoofer s response may still be partially present The reason is that...

Page 18: ...Now play Track 4 and adjust the level at the subwoofer to achieve a reading of 7 dB on the sound level meter We suggest that you make this adjustment on the rear panel of the LSR6312SP by engaging Sw...

Page 19: ...using the LSR6312SP bass man agement system it is recommended a low pass filter be applied to the feed to the sub woofer so the sub does not produce the same bass frequency as the satellite speakers w...

Page 20: ...be used in the rear The front channels and subwoofer have been discussed earlier in this User Guide If you choose to use a pair of LSR6328Ps for the rear channels treat them as discussed in Section II...

Page 21: ...them off other wise the satellites will affect the readings you get when you perform RMC on the sub woofer 2 Perform RMC on the LSR6312SP subwoofer s Since the satellites will be turned off you will...

Page 22: ...FS Full Scale should produce 85 dB SPL from each individual satellite and 95 dB SPL from the subwoofer A 10 dB gain switch is provided on the LSR6312SP SUB DIRECT IN which can be used to conform to th...

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Page 24: ...e CA 91329 list of JBL Professional international distributors is provided at our website Shipping Address JBL Professional 8370 Balboa Blvd Dock D Northridge CA 91329 Customer Service Monday through...

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