It is ok to use a W amp on a W speaker, but you would probably be far from getting the most out of it. Just don't let the amp clip because you could easily cook the driver. More on this next time. Call me on if you need more help or send us an enquiry online. All our products are shipped from our central UK-based distribution centre for guaranteed fast delivery, every time.
Pause slideshow Play slideshow We'll plant 2x trees for every order placed in Q1 In this case two watt cabinets at 8 ohm each would be like a single cabinet at watts at 4 ohms. With the amp you listed doing watts bridged in a 4 ohm load, you are very close to ideal.
This amplifier would perform well with these cabinets. One thing this does account for is AC line sag. If you can afford to bump the amp to a watt amp at 4 ohms you will have another 1. This is often another reason for amplifiers clipping early. If you don't supply solid AC the amplifier can't put out its rated wattage. For PA subwoofers and mains it is best to get as much dynamic headroom as you can in the amplifiers.
It's a lot more fun to run a big rig easy than slamming a small rig to its limits. January 12, It can also be a little difficult — some instruments' best practices are well documented and some are not. Read More. December 29, November 24, International Sales. Frequently Asked Questions. Firmware Download. Become a Dealer. Sing to the Lord with the harp and the voice of the psalm. Knowing the power handling of a speaker is rather useless without considering other specs and details.
Eminence uses an industry standard method EIA A for establishing power ratings. A speaker is tested in free-air with a continuous noise signal with a 6dB crest factor. The music program rating is always twice the continuous rating. It is a higher rating because music has many peaks and dips and is not as abusive as a continuous signal. This is a good rating to select amplifier power for proper headroom in a pro audio application.
Eminence does not publish a peak rating, but we accept it as four times the continuous rating. Peak is higher because the shorter duration of a burst of sound is less abusive than a music signal or a continuous signal. Power testing is performed on all Eminence branded speakers offered on our website. It is at the discretion of our customer to test and rate their amp or cabinet, but rating the speaker may not be a concern for them.
The cabinet or amp containing the speaker will get the watt rating. The more important concerns of the cabinet or amp manufacturer are how well the speaker performs mechanically and sonically.
Clearly, the peaks require far more power than the average levels. In the calculator's Peak Headroom field, enter 6 dB for rock music that is compressed or limited, or enter 20 to 25 dB for uncompressed live music.
If you can live with some short-term clipping which may be inaudible, enter 10 to 15 dB. This is the distance from the loudspeaker to the farthest listener. If you are using several loudspeakers that extend into the audience, this distance is from the nearest loudspeaker. For example, if the audience is feet deep, and you have speakers at 0 feet and 50 feet, the listener distance is 50 feet. If you don't know this distance, you can make a rough estimate from the typical values below.
Be sure to enter the distance in meters m. Coffee house: 16 to 32 feet 4. Listed below are typical sound pressure levels SPLs for various types of music. The SPL meter was set to C-weighting, slow response. You might want your system to be at least 10 dB above the background noise level to achieve a good signal-to-noise ratio.
The calculations discussed here apply to anechoic or outdoor conditions. If the sound system is inside a venue, the room reverberation will increase the SPL typically by 6 dB. You can use this room gain as extra headroom.
Suppose you need to supply watts for peaks, and your speaker's continuous power handling is watts. A speaker's peak power handling is typically 4 times its continuous power handling. So the speaker can probably handle watts peak. That means you can use a watt amplifier to drive that speaker -- as long as you use that power for peaks, and do not drive the speaker continuously with watts.
In other words, don't turn up the amp so high that it clips. What if your sound system uses an active crossover and a separate power-amp channel for each driver? Apply the calculator to each driver type. Say you have a 3-way system. Determine the power separately for the subs, midrange drivers and high-frequency drivers. All three types of driver should produce the same SPL at the same distance.
Note that horn-loaded drivers tend to have much higher sensitivity than subwoofers, so the horns need less power to produce the same SPL as the subs.
Suppose your sound system has multiple loudspeakers that extend into the audience area. For example: an outdoor festival with speaker clusters on delays every feet, or a set of ceiling-mounted speakers.
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