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Junior Varsity
JBL SRX718 & 722 System tunings?
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<blockquote data-quote="Rich Frembes" data-source="post: 40944" data-attributes="member: 432"><p>Re: JBL SRX718 & 722 System tunings?</p><p></p><p></p><p></p><p>I-Tech and dbx 260 filters match pretty closely at the low levels of boost JBL prescribes (yes, I've measured both). The 722 in passive mode requires no PEQ, only a high pass filter to cross into the sub. Here are the settings you should use in the I-Techs:</p><p></p><p><strong>SRX718</strong></p><p>High pass: 30.4 Hz, BW 18 dB/octave</p><p>Low pass: 88.4 Hz, L-R 48 dB/octave</p><p>PEQ1: 41.7 Hz, +1.5 dB, Q 5.016</p><p>PEQ2: 68.2 Hz, +2.0 dB, Q 5.016</p><p>Delay: 0.0 ms</p><p>Gain: 0.0 dB</p><p></p><p><strong>SRX722</strong></p><p>High pass: 74.3 Hz, L-R 48 dB/octave</p><p>Low pass: Out</p><p>PEQ: None</p><p>Delay: 0.0 ms</p><p>Gain: -6.5 dB</p><p></p><p>The relative gain between the SRX718 and SRX722 may need to be adjusted to account for the two-sub-to-one-top ratio and for the 0.8 dB difference in voltage gain between the I-Tech 4k and 6k (when they are set to their default 1.4 V input sensitivity). I would anticipate increasing the gain of SRX722 by 2 to 4 dB.</p><p></p><p>There are no limiter parameters in the dbx 260 file. Even if there were the behavior of 260 and I-Tech limiters is almost certainly different. Your best bet is to see if someone at JBL can help out.</p></blockquote><p></p>
[QUOTE="Rich Frembes, post: 40944, member: 432"] Re: JBL SRX718 & 722 System tunings? I-Tech and dbx 260 filters match pretty closely at the low levels of boost JBL prescribes (yes, I've measured both). The 722 in passive mode requires no PEQ, only a high pass filter to cross into the sub. Here are the settings you should use in the I-Techs: [B]SRX718[/B] High pass: 30.4 Hz, BW 18 dB/octave Low pass: 88.4 Hz, L-R 48 dB/octave PEQ1: 41.7 Hz, +1.5 dB, Q 5.016 PEQ2: 68.2 Hz, +2.0 dB, Q 5.016 Delay: 0.0 ms Gain: 0.0 dB [B]SRX722[/B] High pass: 74.3 Hz, L-R 48 dB/octave Low pass: Out PEQ: None Delay: 0.0 ms Gain: -6.5 dB The relative gain between the SRX718 and SRX722 may need to be adjusted to account for the two-sub-to-one-top ratio and for the 0.8 dB difference in voltage gain between the I-Tech 4k and 6k (when they are set to their default 1.4 V input sensitivity). I would anticipate increasing the gain of SRX722 by 2 to 4 dB. There are no limiter parameters in the dbx 260 file. Even if there were the behavior of 260 and I-Tech limiters is almost certainly different. Your best bet is to see if someone at JBL can help out. [/QUOTE]
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