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<blockquote data-quote="Smaple" data-source="post: 8528202" data-attributes="member: 671292">Hi folks, new here.&nbsp; I have been recently bitten by the upgrade / modernization bug.&nbsp; I have been running a Sony CDX-C90 since 99 and would like to take the plunge into active.&nbsp; The first question I have is, would it be worth trying to track down the old XDP-4000 that Sony made for it, or go with a Helix DSP unit.&nbsp; What would the benefits be either way? Or should I just toss that deck and go with the Pioneer DEX-P99RS and skip the external DSP?The system as it sits right now:&nbsp; Sony CDX-C90, Sony MDX-62 (yeah, I still rock the MiniDisc), Helix A4 for Infinity mids and highs (which will be replaced with Morels at some point soon, and an MTX Thunder 2300x going to a pair of Boston Acoustics 12.5LF2&#039;s. 1/0 ga. power, big three and 220 amp alternator.In addition to the new components up front and possible DSP integration, I wanted to free up some trunk space by switching to just one sub.&nbsp; My initial thoughts are to run with Morel and keep the speakers all the same brand, but I am concerned with the fact I have not had the ability to audition the 12&quot; Morel Ultimo sub.&nbsp; Can I expect similar SQ or better?&nbsp; The Bostons are very nice to listen to and am nervous to change what isn&#039;t broken.TL;DR version - New deck with built in DSP, new Helix DSP or old Sony?&nbsp; One 12&quot; Morel Ultimo Sub to replace two Boston Pro 12.5LF2&#039;s?Ultimately, I would like to keep it very simple and reliable.Tips and advice greatly appreciated.</blockquote>

[QUOTE="Smaple, post: 8528202, member: 671292"] Hi folks, new here. I have been recently bitten by the upgrade / modernization bug. I have been running a Sony CDX-C90 since 99 and would like to take the plunge into active. The first question I have is, would it be worth trying to track down the old XDP-4000 that Sony made for it, or go with a Helix DSP unit. What would the benefits be either way? Or should I just toss that deck and go with the Pioneer DEX-P99RS and skip the external DSP? The system as it sits right now: Sony CDX-C90, Sony MDX-62 (yeah, I still rock the MiniDisc), Helix A4 for Infinity mids and highs (which will be replaced with Morels at some point soon, and an MTX Thunder 2300x going to a pair of Boston Acoustics 12.5LF2's. 1/0 ga. power, big three and 220 amp alternator. In addition to the new components up front and possible DSP integration, I wanted to free up some trunk space by switching to just one sub. My initial thoughts are to run with Morel and keep the speakers all the same brand, but I am concerned with the fact I have not had the ability to audition the 12" Morel Ultimo sub. Can I expect similar SQ or better? The Bostons are very nice to listen to and am nervous to change what isn't broken. TL;DR version - New deck with built in DSP, new Helix DSP or old Sony? One 12" Morel Ultimo Sub to replace two Boston Pro 12.5LF2's? Ultimately, I would like to keep it very simple and reliable. Tips and advice greatly appreciated. [/QUOTE]

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