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Author Topic: Highest Output Powered Single 18" sub....  (Read 3585 times)

Richens Lance

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Highest Output Powered Single 18" sub....
« on: February 11, 2018, 07:01:10 pm »

Now on the surface this is going to seem like another repetitive, possibly juvenile subject. However, hopefully it will not end up that way.
With the summer season looming I am in need of replacing my "smaller system". I plan to buy a pair of single 18' powered subs and a pair of single 15" plus horn tops, also powered.
I want to purchase a system with the highest output possible. Being a "JBL guy", my first choice would be SRX 818 sp's topped with 815's. I need a top boxes like these as they will also get used as standalone's on many occasions.
I am looking at JBL, EV, QSC, and RCF. Here's the thing. The SRX800sp is only "rated" at 1000 watts, yet has basically the same SPL rating as the others. Suggestions and advice here would be appreciated. I will probably go with the "tops" from whichever sub manufacturer I go with.


Here are the spec's on subs:


JBL SRX818SP Subwoofer Specifications
•System Type: Self powered 18", subwoofer system
•Maximum SPL Output: 135dB
•Frequency Range (-10dB): 35hz - 120khz
•Frequency Response (- 3dB): 29hz - 150khz
•System Power Rating: 1000W Peak , 750W Continuous
•Input Impedance: 40k balanced, 20k unbalanced
•Line Input Gain: 21 dB
•Consumer Input Gain: 33 dB
•Max Input Level: Line: 20dBu, Consumer: 8dBu
•Connectors: Neutrik 1/4 - XLR input; Neutrik XLR Output
•LED Indicators: Power LED (Green), Network Link (Green), Network Data (Yellow)
•Cooling: On-Demand variable speed fan
•AC Power Input: 100V - 240V 50/60Hz
•AC Power Consumption (120V): 2.2A (1/8th Power), 5.6A (1/3rd Power)
•LF Driver: 2279F
•Crossover Frequency: 80hz
•Enclosure Material: 18mm plywood
•Suspension/Mounting: M20 Threaded Pole Mount
•Handles: 4
•Finish: Obsidian Duraflex finish
•Grille: Powder coated, Obsidian, 14-gauge perforated steel with acoustically transparent black cloth backing
•Dimensions (L x W x H): 26.89 x 26.92 x 22.62" (683 x 684 x 575mm)
•Weight: 87.0 lbs (39.5kg)
•Shipping Weight: 103 lbs (46.8kg)
•Accessories: Power Cable, Quickstart Guide

QSC KW181 Loudspeaker Powered PA Subwoofer Specifications
•Configuration: 18 inches subwoofer
•Transducer:18 inches cone transducer
•Frequency Response (-6 dB): 43 Hz - 97 kHz
•Frequency Range (-10 dB): 39 Hz - 145 Hz
•Maximum SPL (1 meter): 132 dB peak
•Power Output: 1000 W Class D continuous
•Input Impedance (ohms): XLR / ¼": 38k balanced / 19k unbalanced
•Controls:  ◦Power
◦Gain
◦LF Mode (Normal/DEEP)
◦Polarity (Normal/Reverse)
◦Front LED (On/Off/Limit)

•Indicators: Power, Signal, Standby, Limit
•Connectors: Dual balanced female XLR/¼" line level input, Dual Balanced male XLR full range line level out, Remote gain control, Locking IEC power connector
•Cooling: On demand, 50 mm variable speed fan
•Amplifier Protection: Thermal limiting, output overcurrent, overtemperature muting, GuardRail
•Transducer Protection: Thermal limiting, excursion limiting
•AC Power Input: Universal power supply 100 - 240 VAC, 50 - 60 Hz
•AC Power Consumption (1/8 Power): ◦100 VAC, 2.3 A
◦120 VAC, 2.01 A
◦230 VAC, 1.13 A

•Material: 15 mm painted birch plywood
•Finish: Black textured paint
•Grille: Black powder coated 16 gauge steel
•Dimensions (HxWxD): 20.1 x 23.4 x 29.9 inches with casters (510 mm x 595 mm x 761 mm with casters)
•Weight (Net): 83 pounds (37.6 kg)

Electro Voice ETX-18P Powered PA Speaker Specifications
 •Frequency Response: 33 Hz – 150 Hz
•Frequency Range: 28 Hz – 180 Hz
•Maximum SPL: 135 dB peak
•Power Rating: 1800 W
•LF Transducer: DVX3180A 18 inch
•Low Pass Frequency: Adjustable: 80Hz, 100Hz, 120Hz, 150Hz
•Connectors: (2) XLR/TRS combo jack and (2) XLR link output
•Enclosure: 18-mm, 13-ply birch plywood with EVCoat
•Grille: 16AWG steel with powdercoat
•Dimensions (HxWxD): 22 x 27 x 36 inches (550x675x910mm)
•Weight: 114.2 lb (51.8 kg)

RCF SUB 8003AS 18" 2200 Watt Powered Subwoofer Specifications
 •ACOUSTICAL SPECIFICATIONS:
◦Frequency Response -3 dB: 35 Hz ÷ 120 Hz
◦Max SPL: 133 dB
◦Woofer: 18 inch, 4 inch voice coil

•INPUT/OUTPUT SECTION
◦Input connectors: Stereo XLR
◦Output connectors: Stereo XLR
◦Input sensitivity: -2 dBu / + 4 dBu

•PROCESSOR SECTION:
◦Crossover frequencies: Selectable Hz
◦Protections: thermal, rms
◦Limiter: dynamic limiter
◦Controls: Gain,EQ, phase, xover, delay, cardioid

•AMPLIFIER SPECIFICATIONS:
◦Total power: 2200 W PEAK
◦Low frequencies: 2000 W PEAK
◦Total power: 1100 W RMS
◦Low frequencies: 1100 W RMS
◦Cooling: Convection
◦Connections: Powercon in-out

•CABINET:
◦Cabinet Material: Baltic birch plywood
◦Handles: 2 side
◦Pole Mount/Cap: Yes
◦Grille: Steel
◦Color: Black

•Dimensions (HxWxD): 27.32 x 20.59 x 27.56 inches
•Weight: 95.90 lbs


JBL VRX918SP 18 Inch High Powered Subwoofer Specifications
•Power Rating   1500 Watts Peak LF: Dual-Bridged Technology™, Class D
•Frequency Range   31 Hz – 220 Hz
•Dimensions (H x W x D)   508 mm x 597 mm x 749 mm (20.0 in x 23.5 in x 29.5 in)
•Frequency Response   34 Hz – 220 Hz
•Maximum Peak Output   126 dB SPL at 1m
•Bandpass Nominal Impedance LF: 2 x 2 ohms
•LF Driver   1 x JBL 2268FF 457 mm (18 in) dual voice coil, Differential Drive® woofer with neodymium-magnet
•Audio Input Connector   XLR with loop through
•User Controls:
Input Attenuator (0-16 dB) ◦Selectable 80 Hz or 120 Hz Low Pass
◦80 Hz High-Pass enable/disable for XLR loop thru.
•Signal Processing   DSP based, resident in Input Module
•System Management   DSP based limiters for mechanical and thermal protection
•AC Power Operating Range   90-132 VAC or 216-264 VAC, 50/60Hz
•AC Line Voltage   User selectable: 120V/240V (-15%, +10%)
•AC Input Connector   Neutrik PowerCon (NAC 3MPA)
•AC Loop Through Connector   Neutrik PowerCon (NAC 3MPB)
•AC Current Requirements   6A per system at 120V, 3A per system at 240V
•Enclosure   18 mm birch plywood.
•Suspension / Mounting   Optional VRX-AF line-array frame kit or 10 mm forged eyebolts
•Finish   Black DuraFlex™ finish
•Grille   Powder coated, black, 16-gauge perforated steel with acoustically transparent foam
•Net Weight   38.5 kg (85 lb)

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Richens Lance

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Re: Highest Output Powered Single 18" sub....
« Reply #1 on: February 11, 2018, 07:02:55 pm »

BTW, I'm not a newbie. Apparently my old username has been removed due to inactivity or something else....
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Mike Goodreau

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Re: Highest Output Powered Single 18" sub....
« Reply #2 on: February 11, 2018, 07:18:23 pm »




Sent from my iPhone using Tapatalk
I find manufacturer power specs to be a joke.


Sent from my iPhone using Tapatalk
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Mac Kerr

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Re: Highest Output Powered Single 18" sub....
« Reply #3 on: February 11, 2018, 07:18:56 pm »

BTW, I'm not a newbie. Apparently my old username has been removed due to inactivity or something else....

As has been said many times on these forums, "watts" doesn't matter, what matters is rated SPL output.

Mac

What was your previous user name? We don't remove members unless they are only here to break the rules.
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Richens Lance

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Re: Highest Output Powered Single 18" sub....
« Reply #4 on: February 11, 2018, 07:20:39 pm »

It was Lance Richens, and yes, I am looking at the SPL.
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David Sturzenbecher

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Re: Highest Output Powered Single 18" sub....
« Reply #5 on: February 11, 2018, 07:30:20 pm »

It was Lance Richens, and yes, I am looking at the SPL.

Why are you limiting yourself to those manufactures?  Other manufactures make single 18"s that might go louder then those from the acceptable manufactures list.
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Richens Lance

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Re: Highest Output Powered Single 18" sub....
« Reply #6 on: February 11, 2018, 07:31:40 pm »

Why are you limiting yourself to those manufactures?  Other manufactures make single 18"s that might go louder then those from the acceptable manufactures list.

Definitely open to suggestion on this.....
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David Sturzenbecher

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Re: Highest Output Powered Single 18" sub....
« Reply #7 on: February 11, 2018, 07:36:03 pm »

Definitely open to suggestion on this.....

A tapped horn has advantages due to physics where max SPL is concerned. A JTR Orbit Shifter and Danley TH118s both satisfy your "single 18" requirement, and pack some serious SPL.
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Richens Lance

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Re: Highest Output Powered Single 18" sub....
« Reply #8 on: February 11, 2018, 07:48:35 pm »

A tapped horn has advantages due to physics where max SPL is concerned. A JTR Orbit Shifter and Danley TH118s both satisfy your "single 18" requirement, and pack some serious SPL.


Those both look like great boxes. However I need to stay in the 85-120 lb range and a much smaller box size for this setup. I have 4 SRX 728's powered by Itech 8000's when I need to go big.
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Luke Geis

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Re: Highest Output Powered Single 18" sub....
« Reply #9 on: February 11, 2018, 07:50:01 pm »

I will start by saying that not all units here are in the same class of speaker. That may be obvious. However the specs will tell you what you desire to know, even if the marketers and manufacturers don't want you to know it.

Typically you do not get LOUD & LOW in the same sentence. So the loudest sub in this particular group is also likely the not the one that gets the lowest. So what are your goals? If it is simply loud, then get the one with the loudest spec. The next question is at what frequency is that spec derived from?

I own the SRX-818's and I can say with authority that they are not kidding around. They are a serious sub that sound much as the specs suggest and despite the lower wattage, have plenty of oomph. The VRX is no slouch either. Its spec is measured in whole space, so you can expect another 6db in potential output for a half space calculation. This brings it up to 132db, but in my experience it has a bit more under the hood than the specs suggest. A pair of them are very much a formidable beast and 4 of them definitely tell the world whats up for appropriate gigs / venues.

The QSC is also very loud, but I am not a fan of it. There is just a sound characteristic to it that I do not like. It is not exactly a one note wonder, but it pretty much is. I just don't care for this model. It will put out some thump though.

The specs to the RCF show that it should be in theory be a one note wonder. The real world opinion of them is a little different. I have not used one. RCF is in the business of making real gear and I would expect that the specs are true enough to be relied upon. It is likely not the loudest, but it will sound good and perform as expected.

So lets hone in on your needs. I am in the camp / belief that 3db is not a deal breaker, nor even a real factor to consider when looking at two units that have slightly different design goals. If one is designed to go lower, you can expect that it will have less output. Wattage is NOT a true consideration at all I believe. The specs of the SRX based on wattage and output mean that the speaker should have a sensitivity of 104db @ 1 watt 1 meter. This is not an impossible or unlikely spec. Many speakers have sensitivities like that. While not common in MI grade gear, the SRX line isn't exactly MI grade. So can you rely on the peak specs presented? In short, no.

That is the short term output that can be skewed by the scale at which they test them. Some may have actually been measured at 1M, while others at 2 meters and then scaled back to what a 1 meter output should be ( +6db of the 2 meter reading ), but that doesn't tell the whole story. While it may have actually read XXXdb, it may have done so at 1 frequency. If you average the output across all frequencies, it may be several db lower in true output across the board. So we go back again to what do you need and where and what do the specs say?

The truth is that all the above mentioned speakers will perform relatively well in respect to one another. My bet would be that the one that has the loudest spec, will be the loudest ( at the frequencies that make that level of output ). So if all the speakers in this line up are within 10hz of each other in either direction and within 3db of each other in peak output, they may as well be the same unless you are looking for something specific. What is that? All the speakers you have presented are within 3db of each other BTW. Given that 3db is not the end all be all, you can almost flip a coin. I went with the SRX-818 because it was the only one that had user configurable DSP and my experience with the new SRX line has shown that it is a very serious line, is affordable and was not fluffing the numbers much if at all.
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