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Author Topic: Which Sub to go with RCF HDM 45-A? SRX828sp, SUB 8004-AS, or 8006-AS?  (Read 1637 times)

James Liddle

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I have been getting more requests to run sound for outdoor events and outdoor restaurant gigs and as a result I am looking to upgrade from my current RCF 312A mains to the RCF HDM 45-A. The problem is I am at a loss as to what sub would pair well with these. My budget is around $5K for subs (including covers and casters for whatever I buy) and I am currently considering two of the RCF Sub 8004-AS but am concerned they might not be enough to keep up with the HDM 45As. I can also get two SRX828sp for a little less and even three would only be slightly more than two 8004.

So for the past few days I am thinking "well if you need more than two 8004 you might as well just buy the three srx828, or even step up to two 8006". I am kind of stressing about it. Part of me is wondering if I need a reality check, do I really need six 18 inch subs to match two main speakers? It has been suggested to me that the RCF subs sound better than the JBL and I am already buying RCF mains so I would kind of like to stay with the RCF family, but if two 8004s are going to be horribly inadequate than I need help deciding which direction to go. I would appreciate any input on this, or even other suggestions for subs. Thanks!
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Rick Powell

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Three subs would be an odd deployment, but outdoors you usually need a little more to make the same oomph as indoors. I don't have personal experience with the 8004s but they are not regarded as a particularly loud box. Two JTR Orbit Shifters (a 139dB-capable folded horn box that goes sub 40Hz) and a suitable power amp would be within your budget and would outperform a pair of 828s. I'd try to get some opinions on the 8006 from real users, a matched-brand system designed to work with each other is a plus, but I see that they list for almost your budget for one. Maybe a used pair?
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Luis_Marquez

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If you are set on rcf and have not picked up the HDMs , Id suggest you post in the marketplace as WTB HDM-45 and 8006 for pricing. There are several dealers here that could get you better prices than online. Also some members here can direct you to production companies that are turning over inventory. ex. Rcf 8004s

As Rick said, JTR Orbit shifters are serious subs. I have no experience with them but I do have a pair of JTR c212pros. Very nice, compact subs. Their are two pairs of Orbit shifter for sale in the marketplace(April) plus a little extra for a nice amp within your budget.
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Geert Friedhof

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One 8004 isn't enough.
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Bob Faulkner

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The SRX828sp would be way undersized for the RCF HDM cabinet.  Looking at the specs, the 8004 would work, but the 8006 would be "the" choice out of the ones you listed.
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James Liddle

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Thanks for the insight everyone. I am working with a dealer who posts in these forums who has been very helpful. Checking out the Orbit Shifters now, does anyone know if the price on the website includes shipping? I am tempted to stretch my budget and get two of the active ones so my entire system would remain active.
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Chris Grimshaw

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Part of me is wondering if I need a reality check, do I really need six 18 inch subs to match two main speakers?subs. Thanks!

The answer here is this: it depends.


For a singer strumming an acoustic guitar, you don't need any 18"s.

For EDM with sine waves all night, you'll need more subs than you brought. Unless the venue has literally fallen apart, those guys will find the red lights on anything.

To give you an idea, for the EDM nights at an 800-cap indoor venue I used to work at, we found the 3x 2x18"s a side Nexo Alpha system to be slightly lacking in low end output, and added another 4x 2x18"s and a few more of the 15" folded horns that cover the "kick" section.

Someone always wants more bass.

IMO, for a 15" main speaker a side, a decent 2x18" a side is a good place to start. If your events start heading towards those that need more bass, that's the time to start looking for more subs.

Chris
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John Schalk

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JTR also sells a double 18" sub in both powered and unpowered versions.  You can read a thread on the Captivator 218PRO in the subwoofer forum.  When pricing the RCF subs, don't forget to include caster kits and covers.  As a reference point, someone is asking $2k each for used 8004 subs with casters and covers on FB near me.  The 8004 is an older design from RCF, so I'd think you'd really want to consider the 9004 unless it's totally out of your price range.

How many you need is really dependent on the style of music you will be working with and how loud you need the system to get.  But, as a general guide, a 15" + 4" voice coil top box requires at least a double 18" sub under it to keep up for loud, live rock music.  The main reasons for going with single 18" subs are flexibility and portability.  But, they only make sense if you're going to be doing enough events, weddings maybe?, where you just need full sound, but not loud and full.  Pretty much everyone's double 18" powered sub is a better value than buying a pair of their single 18" subs (from the same line.)  One forum user here came up with a nice compromise; she has two SRX818sp and one SRX828sp subs giving her the flexibility to bring as much sub as the gig requires.
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Tim Hite

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I've been steering people this direction for a while now. A pair of single 18's and then add double 18's as needed. Give you a lot of flexibility for smaller gigs. You can always rent more double 18's for bigger shows.

That being said, I'd be looking at the RCF SUB 9004/9006 over the 800x boxes. The 9000 stuff is really stellar in comparison.

As someone else said, get in touch with me or one of the many other RCF dealers on this forum to get your pricing.

One forum user here came up with a nice compromise; she has two SRX818sp and one SRX828sp subs giving her the flexibility to bring as much sub as the gig requires.
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Roland Clarke

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Bearing in mind its a restaurant, any of the options would be enough.  Its down to your price.  The orbit shifters are serious speakers but cut off around 37hz.  The JBLs wont do that, but are a great double 18 for the money.  The RCF are of course a perfect match, but are more money.  Its about the economics and the return on the investment, if and when you you come to sell.
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