The 551 Inductor EQ from Rupert Neve Designs is a three-band EQ with custom-wound inductors, transformers, and class-A gain blocks. The low-frequency band on the 551 can be used as either a shelf or a peak filter, adding punch, dimension, and control to your low end. The 551's inductor midrange band is ideal for sweetening vocals and instruments while bringing them forward in a mix, and its proportional "Q" response makes it well suited for minimizing problematic frequencies. The high-frequency band is a hybrid vintage/modern design, blending inductor circuitry with capacitor-based topologies to achieve vintage tones with enhanced control. The high-pass filter is a 12 dB/octave design with a fixed 80 Hz frequency, and can be used in tandem with the low-frequency EQ to add low-end presence without clouding the source material.

Both the high and low band can be switched from shelf to peak curves and offer 15 dB of boost or cut. The high band can be switched from 8 to 16 kHz, and the low band can be selected at 35, 60, 100, or 220 Hz. The inductor-based mid band offers six center frequencies: 200, 350, and 700 Hz, and 1.5, 3, and 6 kHz. The mid band also has an "MF Hi Q" switch to narrow the bandwidth (increase the Q) of the filter.

Engages all bands of the equalizer except the hpf

Adjusts up to 15 dB of boost or cut at selected low, mid, and high frequencies

Four different EQ curves to finesse the high-frequency content

Peak mode utilizes an inductor and capacitor circuit to create the

bell-shaped curve

MID FREQ rotary switch has six positions to select the center frequency of the

mid-band EQ stage: 200, 350, and 700 Hz, and 1.5, 3, and 6 kHz

Engages a 12 dB per octave high-pass filter set to 80 Hz

Four LOW FREQ options: 35, 60, 100, and 220 Hz

Related Questions and Answers

Q: 1. will this work with a celestron Nexstar 11 gps (2004 model year) ?

A: You will need the NexStar+ Hand Control USB, AZ, Item #:93981.

Q: 2. Will this controller work with the SkyWatcher Virtuoso?

A: Unfortunately no. It is not compatible. Sincerely, Garret at Celestron

Q: 3. will this controller work wit celestron nexstar 8 se?

A: You would need the AZ Version. The Celestron NexStar+ AZ Hand Controller will work. Website link: https://bhpho.to/2CD4uof

Q: 4. I've seen reviews say that this doesn't come with a power supply. Is that true?

A: This interface comes with a power supply.

Q: 5. is this control will work with nexstar 60 SLT

A: for their Advanced VX, CGEM, CGEM II, CGEM DX, CGX, and CGE Pro motorized and computer-controlled equatorial telescope mounts ONLY

Q: 6. What firmware version number does this controller have?

A: It depends on the time when the hand control was issued. For more information, contact Celestron Technical Support at: mail@celestronsupport.com to find out the latest firmware release. Sincerely, Garrett at Celestron

Q: 7. Can you attach an Arca Swiss clamp to the camera mount so you can slide a compatible plate into the clamp rather than using a ballhead with an Arca Swiss clamp. My preference not to have to remove plates from camera/lens to attach to camera mount (attached to the declination bracket)?

A: According to your procedure it would be possible.

Q: 8. Is it compatible with mounting celestron advanced cg5 gt?

A: It works with my CG-5 mount, which I purchased in 2003.

Q: 9. Will this work for a Celestron CGE Eq mount?

A: Yes it should work.

Q: 10. Will this work with an Advanced GT, maybe with a firmware change?

A: Yes, the NexStar+ EQ Hand Control is compatible with the older Advanced GT mount.