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SRM450

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 How tightly should the pole-mount screws be fastened onto a speaker stand?
The SRM450 includes a convenient pole-mount adapter within its chassis; eliminating the need for troublesome externally-mounted hardware. Included in this feature is a mounting screw which provides a convenient balance point for the speakers so they don't flop around atop their stands. These screws should be approximately finger-tight, as they are not designed to permanently affix the speaker to a stand (otherwise we would have included a tube of epoxy).

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 How many SRM450 loudspeakers can be chained together using the THRU jacks?
The number of SRM450 loudspeakers that can be chained together at a time is limited only by the output impedance of the mixer or equipment that is directly feeding them. To insure optimum signal transfer, the net input impedance of a group of SRM450 inputs (ZT) should be no less than 10 times the output impedance of the equipment acting as the signal source. The net input impedance of a group of SRM450's can be found by donning a propeller-laden cap, and using the following simple formula:

...where n = the number of SRM450's being chained together and ZT = The total input impedance in Ohms of the SRM450 chain.

For those of you with Mackie compact VLZ and VLZ PRO mixers, this means that you can chain up to sixteen SRM450's together without any problem; and if this isn't loud enough, then you should remove the earplugs before continuing.

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 What is the frequency response and power output of an SRM450 Powered Monitor?
The SRM450 loudspeaker has a total system frequency response of 45Hz to 20,000Hz. As proud SRM450 owners will attest, these boxes have tremendous response for their size and plenty of power to boot! The woofer is powered by a 300-watt FR Series amplifier for tons of low end, and the compression driver is backed up by yet another 100-watt FR Series amp for crisp, clear high-end response.

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 What is the proper method for flying or mounting the speaker?
Since the birth of the SRM450, our dedicated, over-caffeinated engineers here in the Mackie active loudspeaker design department have been working non-stop to make the SRM450 the most effective solution for just about any situation demanding a portable, powerful, self-contained sound system capable of delivering world-class acoustic performance for the discerning listener. But what about fixed installations, you say? In addition to making the SRM450 a portable system, our engineers have designed the speaker with integrated fly points to simplify its integration into a permanent installation. Due to the inherent dangers involved in hanging or mounting these or any speakers, we strongly recommend that a qualified professional be employed in any such installation.

The SRM450 accepts M-10 eyebolts, which have a 1.5 mm thread diameter and 20 mm length. You can obtain rigging kits from Allen Products (www.allenproducts.com).

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 What are the AC power requirements of the SRM450?
The SRM450 is designed to operate from a standard 120VAC outlet*. During normal operation, the SRM450 draws less than 1 amp, however under maximum SPL conditions, where the amplifiers in the SRM450 are clipping, the 120V model can draw as much as 2.5 amps (1.3 amps for the 230V model).

* Also available are 100V, 220V, and 230V models for our international customers.

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 Will the SRM450 function as a floor monitor?
Absolutely!! In fact, you will probably have a hard time finding a floor monitor that sounds as good as this! The asymmetrical trapezoidal design of the box lets you set the speaker on its side giving the perfect tilt for a floor monitor -- without tipping over and making a hassle.

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 Is it normal for the speaker to "pop" when it is switched on or off?
It is normal for the SRM450 to emit a slight "pop" when it is powered up or down. The pop is caused by electricity left inside the amplifier circuitry discharging to the speaker.

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 The speaker hums when I connect something to its input...
The presence of a 60Hz hum in the speaker only when a connection is made to another piece of equipment suggests the presence of a ground loop. Such a loop is caused by electrical interaction of the signal grounds on two pieces of equipment, and is not necessarily an indication of broken gear. If a balanced connection to the SRM450 is being used, the simplest way to correct this problem is to lift the signal ground on the end of the connecting cable closest to the signal source. NOTE: This is not to be confused with disconnecting the safety ground on the power plug - this should be avoided at all costs, as it can present a safety hazard. If an unbalanced connection is being made to the SRM450, a line coupler such as the Ebtech Hum Eliminator can be used to eliminate the ground loop.

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 There is a lot of hiss and noise when I connect the input of my SRM450 to my mixer/instrument/cat...
There are a number of factors that could contribute to excessive noise coming from an SRM450. Of these, one of the most common of these is the use of unbalanced lines are naturally more prone to RF and other induced noise, thus it is always better to use a balanced connection whenever possible. When troubleshooting a noisy system, the first thing that should be done is to isolate the signal source, and establish that the signal there is clear of noise. Once this has been established, equipment can be connected back into the signal chain and monitored until the source of the noise can be established.

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 The music coming through my SRM450 sounds fuzzy or distorted...
If the signal on the output of your SRM450 sounds distorted, the first step to take is to check the PEAK indicator LED on the back of the speaker. If this indicator lights frequently or constantly, you should turn down the LEVEL control on the back of the speaker or back off on the level of the signal source.
 

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