Goodmans Audioms 18P, Audioms 8PA, ProPower Gr 12, ProPower Di12, ProPower PP12 User guide

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Goodmans Power Range

Goodmans Power Range loudspeakers are for professional use, where reliability has to complement the total sound performance. Power range loudspeakers are found in such diverse situations as acoustic research, pest control and alarm systems. The most usual applications with suggested units are shown on the table.

Dimensions of suitable cabinets are given overleaf together with advice on impedance matching, systems with high-frequency horns, and measuring conditions.

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Typical Applications		Audioms		ProPower		Audiomax	Hifax
		8PA 18P	PP12	Di12	Gr 12	12AX, 15AX	50HX
Public Address	Indoors Outdoors	٠	٠		۲	•	•
Musical Instrument Amplification	Electronic Organs Electric Guitars Bass Guitars	:			•	• •	•
Discotheques			•	۲	٠		٠
Theatres				•
Clubs		•		٠

Audiom 8PA

Nominal impedance: Nominal power handling: Fundamental resonance: Sensitivity (96 dB at 1 m): Recommended enclosure volume for single unit: Depth, overall: Diameter, overall: Baffle hole diameter: Fixing hole diameter: Fixing hole centres:

15 Watts 85 Herz 3.5 Watts 20 Litres 90 mm 204 mm 178 mm 4 off 6 mm

8 or 15 Ohms

Especially developed as a low cost unit for use singly for general sound coverage or in columns with increased directional characteristics for large sound reinforcement installations.

Auctiom 18P

100 Watts 45 Herz 0.6 Watts 120 Litres 222 mm 459 mm 413 mm 8 off 8 mm

A showman's loudspeaker. It is easily able to deal with the massive response required by bass guitars and also the specialist applications in fairgrounds.

Hifax 50HX

Impedance:

Nominal power handling:

Sensitivity:

Depth, overall: Baffle hole: Fixing hole diameter: Fixing hole centres: MOUTH OF HORN

The Hifax 50HX is a high power high frequency unit with an integral filter, that operates over the upper octaves of a 50 Watt system when used with Goodmans Power Range loudspeakers.

In high power systems one Hifax 50HX is required for each nominal 50 Watts of the total power available and should be connected in parallel with the bass unit(s).

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Goodmans EFORTEF Range

ProPower PP12

75 Watts 75 Herz 0.65 Watts 50 Litres 135 mm

278 mm 4 off 8 mm 298 mm (PCD)

The ProPower PP12 is the successor to the Audiom 12P, the popular "work-horse" in the Power Range but offers an increase in power handling capacity to 75 Watts.

ProPower Di 12

8 or 15 Ohms 90 Watts 85 Herz 0.7 Watts 50 Litres 142 mm 311 mm 278 mm 4 off 8 mm 298 mm (PCD)

The ProPower Di12, twelve inch twin cone loudspeaker succeeds the successful Audiom 12P-D and is engineered with a higher power handling capacity — 90 Watts — for a range of applications where high sensitivity and a wide

frequency response are required. For high quality PA, either singly or in

For high quality PA, either singly or in multiples to increase the directional characteristics, it may be used to reproduce music in a variety of conditions from discotheques to dance clubs and theatres. It gives good results when used for musical instrument amplification (organs, etc.) at home or at medium powers for cabaret clubs and theatre performances.

ProPowerGr12

8 or 15 Ohms 90 Watts 75 Herz 0.6 Watts

50 Litres 142 mm 311 mm 278 mm 4 off 8 mm 298 mm (PCD)

The ProPower Gr 12 follows the Audiom 12P-G with a frequency characteristic particularly suited to amplification of rock musical instruments and outdoor PA, but with improved power handling up to 90 Watts.

The frequency response curve shows a rising output with a maximum at about 3 kHz. This gives "carry" and good articulation to speech in difficult Public Address situations.

The built-in high frequency lift gives good attack and a clean sharp sound when used for guitar and organ amplifiers in pop music groups. Its robust construction allows it to handle the output of amplified bass guitars particularly well especially when used in multiples.

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Audiomax Speakers

Audiomax 12AX

8 Ohms 100 Watts 70 Herz 0.12 Watts 40 Litres 125 mm 312 mm 278 mm

These useful loudspeakers combine the extremes of high power handling capacity and high sensitivity. Where high sound levels are required, the Audiomax speakers will show their economy. Their high efficiency simplifies the design of high level sound systems compared with the alternative of a multiplicity of less sensitive loudspeakers coupled to extremely high power amplifiers.

The Audiomax has a very high flux magnet system and a 10 cm diameter voice coil which combine to give unsurpassed control of the plastic terminated fibre cone. The combination of magnetic, acoustic and mechanical damping throughout the operational frequency range is manifested in its crisp sound and fast response to signals of a transitory form.

The 15AX, the 15" version, will find many uses in common with the 12AX.

Recommended Enclosures

In order to exploit the maximum potential of the Audiomax 12AX and 15AX, its enclosure or housing must be designed and constructed with care. For the reproduction of signals which have relatively narrow bandwidths, e.g. speech for P.A. and electric guitars, sealed enclosures of the specified volume are adequate. For extended low frequency range, Audiomaxes can be fitted in tuned resonance reflex enclosures and for increased efficiency used as a drive unit for a low frequency horn.

Of the maximum power is to be realised with low distortion, high-pass filters should be fitted to amplifiers to remove frequencies that are lower than the system resonance or horn cut-off frequency.

Audiomax 15AX

Nominal impedance: Nominal power handling: Fundamental resonance: Sensitivity (96 dB at 1 m): Recommended enclosure volume for single unit: Depth, overall: Diameter, overail: Baffle hole diameter: Fixing hole diameter: Fixing hole centres:

8 Ohms 100 Watts 60 Herz 0.25 Watts

80 Litres 144 mm 395 mm 356 mm 8 off 8 mm 375 mm (PCD)

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Using Power Range Loudspeakers

Recommended Enclosures

The recommended enclosures for Goodmans Power Range loudspeakers should be rigidly constructed from high density chipboard or plywood (not blockboard) screwed and glued together. All joints should be airtight.

The totally sealed enclosures should be loosely lined with layers of 2" thick fibreglass making sure that it does not interfere with the loudspeaker cone. Protective bars or material across the baffle hole must be recessed or fitted so that the movement of the cone is not restricted.

All dimensions are internal to allow for choice of material thickness. The proportions can be varied but the volume must remain the same.

If Goodmans Power Range speakers are used in open baffles or reflex cabinets, the low frequency response must be controlled to prevent excessive cone excursions at low frequencies where these cabinets present little or no acoustic loading.

Connecting the Loudspeakers

Loudspeakers can be wired in series or parallel, or indeed any combination of these to obtain a convenient total load impedance for the amplifier. Do not use loudspeakers of differing impedance in one system, as this will cause uneven distribution of audio power. Observe the polarity of the nnections at all times, particularly where more than one roudspeaker is housed in an enclosure.

Nominal Power Rating and Test Conditions

Goodmans Power Range loudspeakers have a nominal rating based on actual working conditions when used for reproducing the complex random waveforms of music and speech.

The loudspeakers are tested at 20°C in the recommended enclosure using the standard filtered noise signal as defined in DIN 45:573.

The nominal rated power, measured as a true RMS voltage across a resistance equal to the loudspeaker impedance value, is applied continuously for periods of 3 hours with a cooling time of not less than one hour between. This test is repeated for a minimum of 100 hours actual operation.

Sine wave testing should be carried out with caution and only within the frequency range from resonance to 10kHz with the loudspeaker fitted in its recommended enclosure. The maximum input voltage should not exceed

Nominal impedance × Nominal rating (Watts)

Shown on the loudspeaker label and this can be sustained for a maximum period of 1 minute. It is recommended that if the test is for a longer period, the input voltage is reduced to 0.7 of the above figure.

The power output may have to be reduced if the loudspeaker is to be used at ambient temperatures exceeding 20°C.

In multiple systems the power available to individual units must not exceed the nominal after taking into account a ±10% impedance tolerance. Where high frequency units form part of the system, the recommended filters must be used and the system power not exceeded.

Systems with Hifax 50 HX

50 watt system circuit Input 50 Watt from Bass amplifier L.S. Input 100 Watt from Bass amplifier L.S. - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass units - Two Bass

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Selecting Suitable Power Loudspeakers

Loudspeakers should be chosen to handle the maximum power of the driving amplifier and this is often in excess of its rated sine wave power capability due to power supply regulation and/or its overload characteristics. Instantaneous and distorted outputs of 1.5 times the amplifier rating are commonplace and the amplifier power should be multiplied by this factor when selecting suitable loudspeakers for use under these conditions.

Loudspeaker Life

The quality of sound from and the length of life of a loudspeaker depends largely on the performance of the having good stability, fast recovery from an overload condition signals outside the loudspeaker pass band will not only give loudspeaker. The converse also applies.

For Clubs, Discotheques and Stage Monitor Systems

High power handling
High sensitivity
Wide sound dispersion

The dB 50 is a two-way loudspeaker system in a reflex enclosure of

The system combines high efficiency with high power handling capacity, wide sound dispersion and a smart appearance which will make it particularly suitable for use in permanent and semimusic for parties and at home

Other applications include use by groups and bands in studios and as stage monitors.

Technical Data .................................. Drive Units

Crossover frequency Useful frequency range (-3dB points) Recommended amplifier (music) power rating Recommended amplifier impedance Sensitivity (96dB at 1 metre) Weight Dimensions Finishes

Twin-ported reflex of 50 litres Mid/HF horn 2 kHz 80-18.000 Hz

2-75 Watts

4 or 8 ohms 0.4 Watts

380 × 620 × 305 mm Teak effect finish

other Goodmans products

Goodmans, with sales in more than 100 countries world-wide international name in the field of high-fidelity equipment

The Goodmans range of high-fidelity equipment includes: bookshelf and floor standing loudspeakers, music centres and

Goodmans Loudspeakers Ltd., Downley Road, Havant, Hampshire PO9 2NL England.

Specifications

The specifications printed in this leaflet are correct at the time development, the right to modify them is reserved. Full instructions for all Goodmans products are available on data sheets from the Technical Advisory Department.

en Print and Graphics, Havant 486566.