Pinknoise Sound Devices 633 3-Channel Expander

Pinknoise Sound Devices 633 3-Channel Expander
Pinknoise Sound Devices 633 3-Channel ExpanderPinknoise Sound Devices 633 3-Channel ExpanderPinknoise Sound Devices 633 3-Channel ExpanderPinknoise Sound Devices 633 3-Channel Expander

Pinknoise EXCLUSIVE 3 Channel Mic Amplifier for Sound Devices 633

The custom Pinknoise 633 mic to line level expander is designed as an add-on for the Sound Devices 633 mixer recorder. Comprising of a three channel super quality microphone amplifier that mounts below a Sound Devices* 633 mixer/recorder. It extends the capacity for the SD 633 from three to six mic inputs by using the three line inputs available on 3-6 of the inputs on the SD 633. 

This custom expander has three low-noise, Hi gain microphone inputs through standard XLR’s. Each input has selectable 48 V phantom power, pre-gain control (20 - 60 dB) and channel fader with 18 dB gain. In all, maximum gain is 78 dB.

  • Three low-noise line to mic inputs, HI Fi quality
  • Gain control up to 78 dB
  • 48V Phantom Power, switchable on all channels
  • Over range indicator for input clip
  • Heavy duty study aluminium case
  • Shaped to fit below an SD 633
  • Internal Batteries on 6 x AA
  • External DC 6-18 V on 4 pin Hirose with power thru

Each input has a LED indicating over range. Outputs are in a single TA-7 socket for connection to the additional three line inputs of the SD 633.

Power supply options include six internal AA batteries and external DC through a 4-pin HIROSE socket with pass-thru to the SD 633, saving outputs from power distribution. The unit is made in black-anodized aluminium with laser-engraved text for the highest durability.

Fitting the add-on to the bottom side of the SD633 is easy. There are four screws in the SD633 holding the bottom plates. These are replaced by four slightly longer screws (included) that will tie the add-on to the SD633. No internal wiring is needed. The fitting kit is included with instructions with each expander.

Bag Options:

K-Tek Stingray Small
When piggy backed together both the Sound Devices 633 and 633 Expander will fit in the main compartment. The velcro divider has to moved further up towards the front to allow extra room. There is still space for two receivers in the second compartment of the main bag area.

Orca OR-32
The Orca OR-32 is designed for the Sound Devices 644. However, the extra space and two velcro dividers offers the engineer options:

  • For a piggy backed SD 633 and 633 Expander - Remove the back velcro divider which allows both to fit within the back compartment space. The remaining velcro divider can be brought back to fit the SD 633 and Expander comfortably. There  is plenty of space for receivers and accessories at the front end of the main compartment.
  • Pack the Sound Devices 633 and Expander within their own compartments between the velcro dividers. This will allow the normal amount of space at the very front of the main compartment for receivers and accessories.

Orca OR-30
The Orca OR-30 isn't the best fit due to the little space remaining in the bag. However, both will fit in the main compartment either piggy backed or with the divider in between.

If you have any questions, please email or use the live chat function on the website.

633 Addon Technical Data

Gain Range 20...78 dB
Max Input Signal -2 dBu
Max Output Signal +24 dBu @ 10K ohms (balanced)
Frequency Response 20...40kHz +0 / -0.8 dB

0.001% @ -14 dBu, 1 kHz, 38 dB gain

0.04% @ -54 dBu, 1 kHz, 78 dB gain

Equiv. Input Noise -127 dBu, A-weighted @ 78 dB gain
Phantom Voltage 48 V +-2 V, max 15 mA
Power Supply

6 x AA alkaline or NiMH batteries for 6 - 10 hours continuous use

Ext. DC 6 - 18 V (HIROSE HR10 4pin)

Size WxHxD 203 x 40 x 125 mm
Weight 980 grams
Specifications are subject to change without notice.

Delivery Services

At Pinknoise Systems we like to offer our customers a wide choice of delivery options for their orders, and our prices are affordable and competitive. We also use only the best, most reliable couriers and delivery services to get your equipment where it needs to be - quickly and securely. Please find an outline of our services, prices and timescales below.

Service Timescale Price
UK Mainland Royal Mail Small Parcel 2-4 Days £3.99
UK Offshore Royal Mail 2-4 Days £9.99
UK Standard Courier 2-4 Days £6.49
UK Express Courier Next Day £7.99
International Shipping From 1-8 Days (Full Details) From £15.00

Delivery Times

Delivery times are based on when the packages leaves our premises. Sometimes, due to stock restrictions or a non completed order, delivery may take longer as there is a delay with dispatch. We will always notify customers of any issues and problems via email or telephone. If your order is urgent or details change please do let us know.

For full details, fees, and time schedules, please see our Delivery Information page.

Returns & Refunds

New items: You can return goods you have ordered from us for any reason, at any time within 7 working days of receipt, for a full refund or for an exchange for a different product from our range. The cost of returning goods to us shall be borne by you, the customer, in all circumstances without exception.

Items must be packed suitably and insured for full loss in the event of a delivery problem. Pinknoise Systems will not be responsible for lost or damaged return goods. Lost or damaged goods may effect the level of refund you receive.

Used items: Please note this does not apply to used item unless they are deemed faulty.

For full details of our returns policy, please click here.

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£499.00 £689.00
Saving Of:  £190.00 (28%)
(£415.83 Exc. VAT)


Only 2 in stock  

Only 2 in stock

Delivery hours
UK ORDERS: Order soon for delivery on using our express service

Model:  PN-SD633-3CH-EXP
Part No.:  SD633
Manufacturer:  Pinknoise Systems

Pinknoise Systems
Contact us for advice

Need advice? Give us a call

(+44) 01453
825 802

International Delivery

International delivery

We ship across Europe and around the world and have a multitude of shipping options available to our international customers during the checkout, including express delivery for urgent orders.


We have a next day shipping option available for the UK with our DPD courier service, which features delivery alerts, personal delivery preferences and driver tracking with the DPD mobile app.


Spread the cost to maximise your capital. Just call our helpful sales team on 01453 825 802, from 9.30am - 5.30pm, to discuss these options and find out what's available to you.

We accept PayPal, Visa, Mastercard, Maestro, American Express

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