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Junior Varsity
Bang for the Buck subs: JBL SRX828P?
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<blockquote data-quote="Tim McCulloch" data-source="post: 205031" data-attributes="member: 67"><p>I finally have had access to an 828SP so I wanted to see what all the fuss about drive levels is about.</p><p></p><p><strong>THERE IS NOT ANY ADDITIONAL OUTPUT AVAILABLE BEYOND THE RATED LEVEL.</strong> This means that anything you do with the input compressor's output level control doesn't give your "more", you just get to either the input clip, output clip, or hard limiting with less input level.</p><p></p><p>After some poking around in the DSP via Audio Architect I can tell you this: the pass band output level is already set at +6dB. Anything you see in Audio Architect without having the speaker connected to the computer and powered up is simply a place holder value and does not reflect what JBL has put inside the box...</p><p></p><p>I had part of our DB Technologies T-4 out in the shop so it became the top box side... and what I found was that with a PAIR of T4, I needed to dial back the T4 input sensitivity by about -4dB to make them match at my ears. I suppose I could have turned up the 828SP pass band output to +10, but I didn't see any reason to do so. Since we use "subs on aux" about 97% of the time it's a nonissue for us.... but with the T4 dialed back, both parts of the system went into limit pretty much simultaneously with the program material I was using (Peter Gabriel's In Your Eyes, one of the live versions) and it was "yell at the guy an arms length away" SPL. Nice and technical, eh?</p><p></p><p>So now that I've had my hands and computer on an 828SP I'm trying to figure out what all the fuss was about. I wonder if JBL raised the default pass band level after the first batch of production? There were a lot comments from folks that bought the 828SP and just dropped it in where they'd used other powered boxes and found the output level lower. Rather than spin a couple knobs on the top boxes they decided they MUST get inside the 828SP's DSP.... I've not used the other products that were paired with the 828SP by users here or over at PSW, but this confirms my previous suspicions - it's a simple drive level issue (hit it a little harder, you'll be okay).</p><p></p><p>That all said, the 828SP goes deep and seems smooth. I need to do a side by side with the SRX728 and some different power amps (XTI 6002 and I-Tech HD 12000). The 728 seem a little one-note aroud 58Hz to me and I think it's a cabinet resonance because it's impossible to EQ out.</p></blockquote><p></p>
[QUOTE="Tim McCulloch, post: 205031, member: 67"] I finally have had access to an 828SP so I wanted to see what all the fuss about drive levels is about. [B]THERE IS NOT ANY ADDITIONAL OUTPUT AVAILABLE BEYOND THE RATED LEVEL.[/B] This means that anything you do with the input compressor's output level control doesn't give your "more", you just get to either the input clip, output clip, or hard limiting with less input level. After some poking around in the DSP via Audio Architect I can tell you this: the pass band output level is already set at +6dB. Anything you see in Audio Architect without having the speaker connected to the computer and powered up is simply a place holder value and does not reflect what JBL has put inside the box... I had part of our DB Technologies T-4 out in the shop so it became the top box side... and what I found was that with a PAIR of T4, I needed to dial back the T4 input sensitivity by about -4dB to make them match at my ears. I suppose I could have turned up the 828SP pass band output to +10, but I didn't see any reason to do so. Since we use "subs on aux" about 97% of the time it's a nonissue for us.... but with the T4 dialed back, both parts of the system went into limit pretty much simultaneously with the program material I was using (Peter Gabriel's In Your Eyes, one of the live versions) and it was "yell at the guy an arms length away" SPL. Nice and technical, eh? So now that I've had my hands and computer on an 828SP I'm trying to figure out what all the fuss was about. I wonder if JBL raised the default pass band level after the first batch of production? There were a lot comments from folks that bought the 828SP and just dropped it in where they'd used other powered boxes and found the output level lower. Rather than spin a couple knobs on the top boxes they decided they MUST get inside the 828SP's DSP.... I've not used the other products that were paired with the 828SP by users here or over at PSW, but this confirms my previous suspicions - it's a simple drive level issue (hit it a little harder, you'll be okay). That all said, the 828SP goes deep and seems smooth. I need to do a side by side with the SRX728 and some different power amps (XTI 6002 and I-Tech HD 12000). The 728 seem a little one-note aroud 58Hz to me and I think it's a cabinet resonance because it's impossible to EQ out. [/QUOTE]
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