GRAS Accessories for Preamplifiers

GRAS Sound & Vibration offers a wide range of standard accessories in the form of cables, adapters, windscreens and tripods for use in measuring set-ups.

GRAS Sound & Vibration offers a wide range of standard accessories in the form of cables, adapters, windscreens and tripods for use in measuring set-ups. These can be broadly split up under accessories for microphonesfor preamplifiers, for outdoor microphones, for pistonphones and pinna simulators and accessories for ear simulators. Some are included with certain products, some are available as extras. All can be ordered individually. The brief descriptions given here as well as those on downloadable accessories sheet will help you to select what you need for your particular set-up. At all events, feel free to contact your GRAS partner if you need advice or further information.

GRAS Sound & Vibration also offers a wide range of special products and customised solutions. Our experience within the field of acoustics and vibration, combined with our short development time, enable us to provide innovative solutions to complex measurement problems in close co-operation with the customer. For a technical discussion of your measurement requirements, please contact your local representative or contact GRAS Sound & Vibration directly in Denmark.

GRAS AF0008 Adapter for 1/4″ preamplifier and 1/2″ microphoneGRAS AF0008 Adapter for 1/4" preamplifier and 1/2" microphone

The GRAS AF0008 is an adapter for using a 1/2″ microphone cartridge with a GRAS 26AB 1/4″ preamplifier.

Design

The GRAS AF0008 is a tube which gives a longer continuing 1/2″ diameter of the combined assembly. Thereby it is designed for a minimized acoustic influence from the measurement setup for free-field measurements. The adapter is made of high quality stainless steel. The dimensions are shown on a drawing under the tab “System Setup”. Theoretically, the tube should be infinitely long. The microphone cartridge and preamplifier interconnects directly and thereby no attenuation is introduced. This means that the characteristics of the microphone are maintained.

Alternatives

In setups with restricted space or in pressure measurement setups where the preamplifier is not exposed to the measured sound, then you should consider the GRAS GR0010. Consider also the GRAS RA0003 adapter for any standard microphone i.e. will fit microphones cartridges from other manufacturers as well as from GRAS

 

GRAS AG0001 Adapter for 7-pin LEMO to B&KGRAS AG0001 Adapter for 7-pin LEMO to B&K

The GRAS AG0001 is an adapter for a 7-pin LEMO connector and a traditional 7-Pin B&K microphone input connector.

 

GRAS AG0002 CCP Input AdapterGRAS AG0002 CCP Input Adapter

The GRAS AG0002 is an adapter for using a CCP preamplifier/microphone set with a GRAS12AA, 12AG or 12AK Power Module i.e. a Power Module with only LEMO connectors for the microphones. One end plugs straight into the Power Module’s input LEMO connector and the other end has a BNC socket for making a connection with a CCP preamplifier/microphone set.

On the Power Module, the preamplifier voltage must be set to 28 VDC.

 

GRAS AG0003 Adapter for CCP preamplifier to XLRGRAS AG0003 Adapter for CCP preamplifier to XLR

The GRAS AG0003 is an adapter for an XLR connector, with Phantom Power, and a CCP compatible preamplifier with a BNC connector at the end of the cable.

GRAS AL0003 1/4″ & 1/2″ Adjustable Microphone Holder, POMGRAS AL0003 1/4" & 1/2" Adjustable Microphone Holder, POM

The GRAS AL0003 consists of 3 parts: a swivel head for mounting on tripods with a standard 1/4″ UNC-20 thread and adapters for mounting a microphone set with 1/2″ or 1/4″ body diameter on the swivel head. Microphone sets with Microdot connector or integrated 5-pin LEMO connector do not fit.

The swivel head fits any tripod using a 1/4″ UNC-20 male thread. The 1/2″ adapter can then be mounted on the swivel head using the 1/4″ thread at the bottom of the adapter.

To mount a 1/2″ microphone set in the 1/2″ adapter, place the cable in the groove on the adapter and slide the microphone set back until it is held at the grommet (BNC) or union nut (LEMO) of the cable connector.

To mount a 1/4″ microphone, fit the 1/4″ adapter into the1/2” adapter with the grooves aligned to make place for the cable and slide the microphone set back and into the adapter.

For both cases, 1/2″ and 1/4″, run the cable inside the adapter as far as possible for minimum acoustical influence.

Note: Regarding BNC, notice that the connector grommet is the attach point i.e. the installation assumes that GRAS cables are used. Other brand of BNC cables may use a a grommet which does not fit.

Alternatives

Consider the stainless steel microphone holders GRAS AL0013 and RA0096 for 1/4″ or AL0012 and RA0093 for 1/2″ microphone sets (diameter of the preamplifier).

GRAS AL0004 Small light weight microphone tripodGRAS AL0004 Small light weight microphone tripod

The GRAS AL0004 is a light and compact tripod provided with a 1/4″ standard thread.

Alternatives

The GRAS AL0006 Tripod has the same main features but is stronger and more stable.

 

GRAS AL0005 Swivel headGRAS AL0005 Swivel head

The swivel head is provided with a 1/4″ UNC-20 male thread for a GRAS microphone holder which in turn holds the microphone set. The bottom of the GRAS AL0005 is provided with a 1/4” UNC-20 female thread for a compatible tripod e.g. GRAS AL0006.

Notice that the swivel head AL0005 is included in GRAS AL0003.

 

GRAS AL0006 TripodGRAS AL0006 Tripod

The GRAS AL0006 is a versatile and robust tripod for measurement setups and cameras.

Its main features are:

  • Standard mounting thread (¼˝ whitworth)
  • Practical carrying handle
  • Crank-adjusted centre column
  • Rubber feet with adjustable spikes
  • Adjustable tripod legs with locks
  • Locking of tripod-legs cross brace
  • Max height 161 cm
  • Retracted 65 cm
  • Weight 1.6 kg

Alternatives

The GRAS AL0004 Tripod is small and lightweight has the same main features. It is not as strong and stable as the AL0006.

GRAS AL0008 1/2″ Microphone Holder, POMGRAS AL0008 1/2" Microphone Holder, POM

The GRAS AL0008 is an adapter for mounting a microphone set (microphone/preamplifier) on tripods having a standard 1/4” UNC-20 male thread. The adapter clamps on 1/2″ diameter preamplifier. For minimum acoustic influence, clamp as close to the output as possible.

Alternatives

The GRAS AL0012 is a stainless steel microphone holder for 1/2″ microphone sets. Another alternative is the microphone holder GRAS RA0093 which is similar to AL0012 regarding material and usage, but is provided with possibility to adjust the microphone angle between 0 and 180 degrees in 45 degree steps. If total flexibility regarding the angle is required, then consider the GRAS AL0003 which includes a swivel head GRAS AL0005. Notice that the swivel head can be purchased separatelly and can be be inserted between any GRAS microphone holder and a GRAS AL0004 or AL0006 Tripod.

GRAS AL0012 1/2″ Microphone Holder, Stainless SteelGRAS AL0012 1/2" Microphone Holder, Stainless Steel

The GRAS AL0012 is an adapter for mounting a microphone set (microphone/preamplifier) on tripods having a standard 1/4” UNC-20 male thread. The adapter is provided with a clamp for attaching a 1/2″ diameter preamplifier. For minimum acoustic influence, clamp as close to the output as possible.

Design

The AL0012 is designed for a minimum acoustical influence. It is physically small and with smoth rounded surfaces

Alternatives

The stainless steel microphone holder GRAS RA0093 is similar to AL0012 regarding usage, but is provided with possibility to adjust the microphone angle between 0 and 180 degrees in 45 degree steps. Another alternative is the non-metal microphone holder GRAS AL0008. If total flexibility regarding the angle is required, the consider the GRAS AL0003 which includes a swivel head GRAS AL0005. Notice that the swivel head can be purchased separatelly and can be be inserted between any GRAS microphone holder and a GRAS AL0004 or AL0006 Tripod.

GRAS AL0013 1/4″ Microphone Holder, Stainless SteelGRAS AL0013 1/4" Microphone Holder, Stainless Steel

The GRAS AL0013 is an adapter for mounting a microphone set (microphone/preamplifier) on tripods having a standard 1/4” UNC-20 male thread. The adapter is provided with a clamp for attaching a 1/4″ diameter preamplifier. For minimum acoustic influence, clamp as close to the output as possible.

Design

The AL0013 is designed for a minimum acoustical influence. It is physically small and with smoth rounded surfaces.

Alternatives

The stainless steel microphone holder GRAS RA0096 is similar to AL0013 regarding usage, but is provided with possibility to adjust the microphone angle between 0 and 180 degrees in 45 degree steps. Another alternative is the non-metal microphone holder adapter GRAS AL0029. If a total flexibility regarding the angle is required, then consider the GRAS AL0003 which includes a swivel head.

GRAS AL0028 7 mm Microphone Holder, POMGRAS AL0028 7 mm Microphone Holder, POM

The GRAS AL0028 is an adapter for mounting a microphone with 7 mm body diameter on tripods having a standard 1/4” UNC-20 male thread. The angle is fixed at 90 degrees. For minimum acoustic influence, clamp as close to the output as possible. If total flexibility regarding the angle is required, then consider inserting the swivel head GRAS AL0005 between the microphone holder and tripod.

 

GRAS AL0029 1/4″ Microphone Holder, POMGRAS AL0029 1/4" Microphone Holder, POM

The GRAS AL0029 is an adapter for mounting a microphone with 1/4″ mm body diameter on tripods having a standard 1/4” UNC-20 male thread. The angle is fixed at 90 degrees. For minimum acoustic influence, clamp as close to the output as possible. If total flexibility regarding the angle is required, then consider inserting the swivel head GRAS AL0005 between the microphone holder and tripod.

Alternatives

The stainless steel microphone holder GRAS AL0013 is similar to AL0029 regarding usage, but is superior regarding acoustical influence on the measurement. Another alternative is the RA0096 which is similar to AL0013 but is provided with the possibility to adjust the angle between 0 to 180 degrees in 45 degree steps. If a total flexibility regarding the angle is required, then consider the GRAS AL0003 which includes a swivel head AL0005. Notice that the swivel head can be purchased separatelly and can be be inserted between any GRAS microphone holder and a GRAS AL0004 or AL0006 Tripod.

GRAS GR0010 Adapter for 1/4″ preamplifier and 1/2″ microphoneGRAS GR0010 Adapter for 1/4" preamplifier and 1/2" microphone

The microphone and preamplifier interconnects directly i.e. no attenuation is introduced. The GR0010 is suitable in set-ups where the preamplifier is not exposed to the measured sound.
For free-field microphones, we recommend using a microphone and preamplifier with equal diameter.

GRAS RA0011 GooseneckGRAS RA0011 Gooseneck

The RA0011 is a 20 cm flexible gooseneck with 7-pin LEMO connectors for use with preamplifiers with integrated 7-pin LEMO connectors such as GRAS 26AK, 26AJ and 26AB. For example, it can be mounted between the preamplifier and a sound level meter in order to reduce reflections.

GRAS RA0062 20 pF Preamplifier-input Adapter for 1/2″ preamplifiersGRAS RA0062 20 pF Preamplifier-input Adapter for 1/2" preamplifiers

The RA0062 is a 20 pF input adapter for 1/2″ preamplifiers. One end screws on to a 1/2″ preamplifier and the other end has a BNC input connector. This enables connecting a signal generator to the input of the preamplifier.
Short circuiting the BNC input results only in loading the preamplifier by 20 pF. For this purpose a BNC plug with a built-in 50 ohm resistor is enclosed. This plug is used when measuring the noise floor in the preamplifier.

 

GRAS RA0062-S1 50 pF Preamplifier-input Adapter for 1/2″ preamplifiersGRAS RA0062-S1 50 pF Preamplifier-input Adapter for 1/2" preamplifiers

The RA0062-S1 is a 50 pF input adapter for 1/2″ preamplifiers. One end screws on to a 1/2″ preamplifier and the other end has a BNC input connector. This enables connecting a signal generator to the input of the preamplifier.
Short circuiting the BNC input results only in loading the preamplifier by 50 pF. For this purpose a BNC plug with a built-in 50 ohm resistor is enclosed. This plug is used when measuring the noise floor in the preamplifier.

GRAS RA0080 6pF Preamplifier-input adapter for 1/4″ microphonesGRAS RA0080 6pF Preamplifier-input adapter for 1/4" microphones

The RA0080 is a 6pF input adapter for 1/4″ preamplifiers. One end screws on to a 1/4″ preamplifier and the other end has a Microdot input connector. This enables connecting a signal generator to the input of the preamplifier. Short circuiting the Microdot input results only in loading the preamplifier by 6 pF.

GRAS RA0093 1/2″ 5-Click Microphone Holder, Stainless SteelGRAS RA0093 1/2" 5-Click Microphone Holder, Stainless Steel

The GRAS RA0093 is an adapter for mounting a microphone set (microphone/preamplifier) on tripods having a standard 1/4” UNC-20 male thread. The adapter is provided with a clamp for attaching a 1/2″ diameter preamplifier. For minimum acoustic influence, clamp as close to the output as possible.

Design

The RA0093 is designed for a minimum acoustical influence. It is physically small and with smoth rounded surfaces

Alternatives

The stainless microphone holder GRAS AL0012 is similar to RA0093 regarding usage but is provided without the possibility to adjust the angle between 0 to 180 degrees in 45 degree steps. Another alternative is the non-metal microphone holder GRAS AL0008. If a total flexibility regarding the angle is required, then consider the GRAS AL0003 which includes a swivel head AL0005. Notice that the swivel head can be purchased separatelly and can be be inserted between any GRAS microphone holder and a GRAS AL0004 or AL0006 Tripod.

 

GRAS RA0093-S1 1/2″ Adjustable Microphone Holder, Stainless Steel

GRAS RA0093 1/2" 5-Click Microphone Holder, Stainless Steel

The GRAS RA0093-S1 is a microphone holder for mounting a microphone set (microphone/preamplifier) on tripods having a standard 1/4” UNC-20 male thread. The holder is provided with a clamp for attaching a 1/2″ diameter preamplifier. For minimum acoustic influence, clamp as close to the output as possible.

Design

The RA0093-S1 is designed for a minimum acoustical influence. It is physically small and with smoth rounded surfaces

Alternatives

The GRAS RA0091 can be set between 0 to 180 degrees in 45 degree steps. The GRAS AL0012 keeps the microphone fixed at 90 degrees..  Another alternative is the non-metal microphone holder GRAS AL0008.

If a total flexibility regarding the angle is required, then consider the GRAS AL0003 which includes a swivel head AL0005. Notice that the swivel head can be purchased separatelly and can be be inserted between any GRAS microphone holder riodadptr and a GRAS AL0004 or AL0006 Tripod.

 

GRAS RA0094 3-Click Holder for Array Module, Stainless SteelGRAS RA0094 3-Click Holder for Array Module, Stainless Steel

The GRAS RA0094 is an holder for mounting an Array module PR0001, PR0001-1 or PR0002 on tripods having a standard 1/4″ UNC-20 male thread. The adapter is provided with a clamp for attaching the Array module. Angular adjustment 180°  in steps of 45°.

GRAS RA0096 1/4″ 5-Click Microphone Holder, Stainless SteelGRAS RA0096 1/4" 5-Click Microphone Holder, Stainless Steel

The GRAS RA0096 is an adapter for mounting a microphone set (microphone/preamplifier) on tripods having a standard 1/4” UNC-20 male thread. The adapter is provided with a clamp for attaching a 1/4″ diameter preamplifier. For minimum acoustic influence, clamp as close to the output as possible. The microphone can be set in angles between 0 and 180 degrees in 45 degree steps.

Design

The RA0096 is designed for a minimum acoustical influence. It is physically small and with smoth rounded surfaces.

Alternatives

The stainless steel microphone holder GRAS AL0013 is similar to RA0096 regarding usage but is provided without the possibility to adjust the angle between 0 to 180 degrees in 45 degree steps. Another alternative is the non-metal microphone holder GRAS AL0029. If a total flexibility regarding the angle is required, then consider the GRAS AL0003 which includes a swivel head.

 

GRAS RA0096-S1 7 mm 5-Click Microphone Holder, Stainless Steel

GRAS RA0096 1/4" 5-Click Microphone Holder, Stainless Steel

The GRAS RA0096-S1 is an adapter for mounting a microphone set (microphone/preamplifier) on tripods having a standard 1/4” UNC-20 male thread. The adapter is provided with a clamp for attaching a 7 mm diameter preamplifier. For minimum acoustic influence, clamp as close to the output as possible. The microphone can be set in angles between 0 and 180 degrees in 45 degree steps.

Design

The RA0096-S1 is designed for a minimum acoustical influence. It is physically small and with smoth rounded surfaces.

Alternatives

An alternative is the non-metal microphone holder GRAS AL0028.

GRAS RA0125 Adapter for microdot input to a 1/2” preamplifierGRAS RA0125 Adapter for microdot input to a 1/2” preamplifier

The GRAS RA0125 is to be mounted instead of a microphone on a standard 1/2″ preamplifier such as the GRAS 26AK. Thereby you get a Microdot (UNF 10-32) input to the preamplifier. Useful when a high input impedance is required for transducers such as hydrophones and accelerometers.

GRAS RA0140 Dummy 1” microphone

For checking the inherent noise level of a preamplifier loaded purely by the capacitance of a 1″ microphone.

GRAS RA0185 Holder for Array microphone in PR0002 Array moduleGRAS RA0185 Holder for Array microphone in PR0002 Array module

The GRAS RA0185 is a holder for mounting an Array microphone (7 mm diam.) on a GRAS PR0002 Array module. The holder is designed for a minimum of acoustic influence.

Alternatives

A similar holder for 1/4″ standard microphone sets is available. In this case, typically the GRAS 46BE is used.

GRAS RA0245 Holder for 1/4″ microphone set in PR0002 Array moduleGRAS RA0245 Holder for 1/4" microphone set in PR0002 Array module

The GRAS RA0245 is a holder for mounting a standard 1/4″ microphone set with Microdot connector, typically GRAS 46BE on a GRAS PR0002 Array module. The holder is designed for a minimum of acoustic influence.

GRAS SK0057 Tripod conversion screwGRAS SK0057 Tripod conversion screw

All GRAS tripod adapters and tripods have a 1/4″ UNC-20 thread. If a tripod of other brand is used and this is provided with a 3/8” UNC-16 thread, then mount the GRAS SK0057 on the tripod.

 

 

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