Eminence Omega Pro 18A - 18" Replacement PA Speaker
Eminence Omega speakers are built for all high power bass applications.
Omega Pro Series drivers are by far Eminence’s most widely used high power drivers. All Omega Pro Series drivers feature huge 109oz magnets in massive cast frames and high power 4 inch voice coils. Omega Pro’s are designed to be both extremely accurate and handle tremendous amounts of power. This is an 18 inch, 8 ohm driver that handles 1600 watts music program and provides 25Hz-2kHz frequency response.
Materials of Construction
- Kapton coil former for increased rigidity and thermal protection
- Polyamide-imide coated two-layer, 27ga., copper voice
coil for improved power-handling and durability
- Ferrite Magnet
- Vented core for increased power-handling
- Die-cast aluminum basket for rigidity
- Paper cone
- Cloth cone edge
- Solid composition paper dust cap
The Value of Eminence
Eminence wants to make sure their customers know exactly what they are getting when they buy a speaker. Therefore, Eminence provides two different ratings to describe the power handling of all their speakers.
Watts - the guaranteed long term power rating throughout the useable frequency range of the speaker.
Translation: the speaker will operate continuously at any frequency within the speakers’ specified frequency range when driven at this power. The Watts rating is similar to RMS, but is really more indicative of long term thermal capability.
Music Program - the speaker will safely and reliably handle the varying frequencies of musical content at this power rating.
The Music Program rating is more indicative of what you can expect in the real world with the speaker operating within the appropriate enclosure reproducing music or vocal audio program.
Eminence is committed to quality and guarantees all of its speakers for 7 years. They build all of their speakers to greatly exceed customer performance expectations. Dollar for dollar against competitors, an Eminence speaker is well worth the money that you invest!
It has often been said that Eminence professional loudspeakers are not expensive enough. A genuine American-built cast-frame high performance transducer must surely cost considerably more — after all, most other premium speakers do.
The fact is that nobody else in the world makes quantities like Eminence and nobody else can waste as little during the manufacturing process. If we made fewer and rejected more, we could match their prices… Eminence ‘Pro’ models have always been a remarkably good value. Following a series of detail revisions, they are now an even better value.
The major cause of failure in a loudspeaker is thermal overload. Expansion of moving parts — even melting of parts — is terminal. Some time ago, Eminence approached DuPont about formulating a special type of Kapton™ that could efficiently deal with extreme heat conditions. Except for rare accidental overloads, this material all but eliminated voice coil failures.
Eminence has further developed manufacturing techniques with this material and investigated other problem areas in transducer motor structures. The combined effect of a number of seemingly small adjustments to production techniques, component materials and adhesives has yielded dramatic improvements in power handling.
The transducers in the revised ‘Pro’ range offer power handling improvements of up to 50%. The popular Omega Pro series, originally rated at 600W, is now rated at between 700W and 800W. The Kappa Pro 15LF, once rated at 400W, is now rated at 600W. To recognize these new models, look for their gold back plate labels.
Now more than ever, selection from this range demands a more considered approach than simply reviewing power handling and sensitivity. We recommend consideration of the sensitivity chart and a review of the Thiele-Small explanations as a prelude to selecting samples for computer modeling of enclosure designs and listening tests.
The Eminence professional series represents a collection of the most widely used professional loudspeakers in the music industry. From indoor or outdoor concerts, to churches, night clubs, recording studios and arenas all over the world, Eminence has become well known for virtually all applications. Eminence earned this reputation from engineering and manufacturing transducers that incorporate the latest innovations in an affordable package. Why pay more for an over engineered product? Do what the professionals do: put Eminence Inside!
- Nominal Basket Diameter: 18 inch, 457.2mm
- Impedance: 8 ohms
- Power Rating:
- Music Program: 1600W
- Watts: 800W
- Resonance: 28Hz
- Usable Frequency Range: 25Hz - 2kHz
- 200Hz SPL (dB): 95.0
- 300Hz SPL (dB): 95.0
- 400Hz SPL (dB): 96.5
- 500Hz SPL (dB): 97.0
- 600Hz SPL (dB): 97.0
- 700Hz SPL (dB): 96.0
- 800Hz SPL (dB): 94.0
- 900Hz SPL (dB): 93.5
- 1kHz SPL (dB): 95.0
- 1.5kHz SPL (dB): 101.0
- 2kHz SPL (dB) and Above: --
- Magnet Weight: 109oz.
- Gap Height: 0.375 inches, 9.52mm
- Voice Coil Diameter: 4.0 inches, 101.6mm
- Recommended Enclosure Volume (vented): 62 - 82 liters (2.2 - 2.9 cu. ft.)
- Overall Diameter: 18 inches, 457.2mm
- Baffle Hole Diameter: 16.56 inches, 420mm
- Front Sealing Gasket: Fitted as standard
- Rear Sealing Gasket: Fitted as standard
- Mounting Holes Diameter: 0.25 inches, 6.4mm
- Mounting Holes B.C.D.: 17.25 inches, 438.2mm
- Depth: 8.15 inches, 207mm
- Shipping Weight: 30lbs., 13.6 kg
- Resonant Frequency (fs): 28Hz
- Impedance (Re): 5.1 ohms
- Coil Inductance (Le): 1.67mH
- Electomagnetic Q (Qes): 0.25
- Mechanical Q (Qms): 5.53
- Total Q (Qts): 0.24
- Compliance Equivalent Volume (Vas): 354 liters (12.49 cu. ft.)
- Peak Diaphragm Displacement Volume (Vd): 635cc
- Mechanical Compliance of Suspension (Cms): 0.19mm/N
- BL Product (BL): 25 T-M
- Diaphragm Mass inc. Airload (Mms): 171 grams
- Equiv. Resistance of Mechanical Suspension Loss (Rms): 5.46N*sec/M
- Efficiency Bandwidth Product (EBP): 114
- Voice Coil Overhang (Xmax): 4.8mm
- Surface Area of Cone (Sd): 1159cm2
- Impedance at Resonance (Zmax): 97 ohms
- Maximum Linear Excursion (Xmech): 32.0mm
SPL represents one of the most useful specifications published for any transducer. It is a representation of the efficiency and volume you can expect from a device relative to the input power. This is important because it requires twice the power to increase the volume of a speaker by 3dB. For instance, to increase the volume of a 50W guitar amplifier 3dB (an audible, but relatively small amount), it would require 100W of power. The same outcome could be achieved more economically by replacing the speaker with a model that is 3dB more sensitive.
Loudspeaker manufacturers follow different rules when obtaining this information. You cannot necessarily compare like for like when looking at the sensitivities of different manufacturers’ loudspeakers.
Most manufacturers determine sensitivity by putting the speaker in a baffle and measuring the sound pressure level at one meter, with 1W of input power across the frequency response curve. The problem is that one manufacturer may place the microphone one meter from the dust cap of the speaker and gain a distinct advantage over the manufacturer who placed the microphone one meter from the baffle board. The Eminence method is to measure with the microphone one meter from the baffle board. We then take the frequency response curve and points across what we have specified as the usable frequency range to obtain the average sound pressure level (SPL). Eminence believes this method is extremely accurate and represents exactly what you can expect from the transducer in a specific application.
Although sensitivity is important, be sure not to buy your transducer based on efficiency alone. You must be willing to compromise to get your ideal combination of low-frequency reproduction and sensitivity. If you have lots of power, you can have awesome low-frequency reproduction and maintain lots of volume from a speaker with lower sensitivity. On the other hand, if power is a consideration, you may want to sacrifice some low-frequency reproduction in order to maintain a higher sound pressure level.
As a comparison, think of an automobile. If all you do with your car is drive a few miles to work each day, you can probably get by with a small, efficient compact car that has less than 100 horsepower. On the other hand, maybe you carpool and carry six other people to work with you. In that case, you need a larger, more powerful car. The end result is you gave up efficiency but you were doing much more work. The key with loudspeaker selection is to choose the loudspeaker that offers you what you need in terms of low-frequency reproduction, but has the best sensitivity in its class.