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Tech Talk With Big Tony
Rated at 1,250 watts, the Kilomax Pro 18A and 15A models require an aluminum heat sink to help dissipate heat. As with all loudspeakers, there is a chance a Kilomax can eventually need reconing. In order to replace the cone in these models, you first have to remove this heat sink. Anthony Lucas, Eminence Speaker Tech Support, demonstrates how to remove the heat sink in this video.
One of our most frequently asked tech support questions goes something like this: “Hey I’ve got this old speaker and I’m pretty sure it’s an Eminence. Can you tell me what the power rating, impedance, and other specs are?” In this video, Eminence Speaker Tech Anthony “Big Tony” Lucas points out how to find the information on the speaker he will need in order to help you.
Eminence offers coaxial woofers in 8”, 10”, and 12”, called the Beta-8CX, Beta-10CX and Beta-12CX, respectively. These woofers have a threaded pole-piece so that a screw-on, 1” exit high frequency driver can be attached to form a coaxial set up. The woofer has a screen type dust cap, which allows the output of the high frequency driver to pass through the center. A small, 60 degree conical horn is attached to the top of the pole-piece beneath the dust cap. In my experience, it seems that our coaxial products are misunderstood and do not have enough exposure. In this article, I hope to raise awareness by sharing my own experiences and show how you can use them to create a great monitor or home hi-fi speaker.
Speaker power handling must be the most misunderstood specification in our industry. Knowing the power handling of a speaker is rather useless without considering other specs and details. It’s like knowing the “what” without the “when” or “where.”
Eminence uses an industry standard method (EIA 426A) for establishing power ratings. A speaker is tested in free-air with a continuous noise signal with a 6dB crest factor. This continuous average power rating (or “watts” rating) is basically a thermal limit. Eminence does not associate a watts rating with “RMS.” RMS pertains to voltage or current, but “RMS watts” is an erroneous term. 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.
Are sealed or ported enclosures better for bass guitar? What are the differences between them? In this article, I will compare the two most common types of bass guitar enclosures and try to highlight the benefits and shortcomings of each. It took me a while to decide what details to cover, and I soon realized it might require a book to cover the concepts of cabinet design. It would take a couple of articles this size just to introduce the terminology. For the DIY guys and players interested in obtaining more knowledge, there is a wealth of information available online to learn more about cabinet design. There is also plenty of software available online to help you with calculations. Whether you find information about car audio, home hi-fi, pro audio or bass guitar, the principles are basically the same. This article will be used for the details I feel will help bass players the most.
Speaker break-in is no myth and something significant really does happen. All speakers are built to meet certain specifications, and we work diligently through QC efforts during and after production to ensure that happens. Every component used in a speaker has tolerances, which can relate to small variances in initial performance. The mechanical properties of a speaker are slightly modified once a speaker is put into service, and the tone is affected by these changes. Speaker break-in is a natural process that is influenced by how much you use the speaker and how loud you play it. Think of a new pair of shoes. They are not most comfortable right out of the box. They feel best after you have worn them for a while, softened up, and formed to your feet. Much like your new pair of shoes, new speakers need time to “break in”, and will not sound best until they do.
You may need less power handling from your high frequency driver than you might expect! High frequency drivers will only see a small percentage of system power, if a proper crossover network is used. The woofer section sees the brunt of the power in a system, because lower frequencies are more abusive….
Here’s a question I get quite often: “How much amplifier do I need to properly power an Eminence pro audio woofer?”
This can be a rather ambiguous topic because there is really no “right” answer. You can damage speakers from over or under powering them.
When Eminence released the 12” Red Fang in 2004, we were concerned the industry was not ready to accept a higher power Alnico speaker. The Eminence Red Fang is a very detailed and efficient speaker, so it’s a great compliment for lower power applications. There are a lot of misconceptions about power ratings, and we did not want anyone to overlook it for their lower wattage applications.
Eminence is often asked to provide cabinet plans for our woofers. We do not provide drawings with specific cabinet dimensions and details, but we do offer cabinet recommendations in the form of specifications. The reason for doing it this way is because we do not know what size or shape cabinet you need or want to build. For example, if we specify a rectangular box of “A” width x “B” height x “C” depth, someone may not be able to fit the “B” height where the cabinet needs to be installed. Our approach allows the designer/builder the flexibility to build any shape. We provide multiple recommendations for all of our pro audio and bass woofers within their respective pdf files.
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