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Core Sound Mic2496
Reconfiguring Mic2496's Internal Jumpers for Phantom Power and Sample Rate

DISCLAIMER AND IMPORTANT NOTE

Do not attempt to reconfigure Mic2496's internal jumpers unless you are willing to accept responsibility for possible damage you might cause in the process. That damage will not be covered under warranty.

If you misconfigure Mic2496 so that 48 Volts is applied to the High End Binaural (HEB) microphone set, the HEBs will be destroyed!

If you have any doubts about your ability to follow these instructions correctly, please return Mic2496 to Core Sound for re-configuration.

Instructions for Reconfiguring Mic2496's Internal Jumpers for Phantom and HEB Power

As normally configured by Core Sound, Mic2496 provides 48 Volt phantom for powering condensor microphones.

If you are using Core Sound's High End Binaural microphone set (using DPA 4060/4061 capsules), Mic2496 can be configured to power them directly, without the need for an external battery box.

TO ENABLE P48V PHANTOM POWER AND DISABLE HEB POWER

1. Remove the two level control knobs, inner and outer.

2. Carefully remove all of the small nuts on the shafts of the three toggle switches and the large nut and washer on the 5-pin microphone input jack.

3. Remove the three screws holding the top of the sheet metal chassis (the side with the Mic2496 label).

4.Carefully remove the top of the sheet metal chassis, being sure not to bend or stress the toggle switches as you remove the top. Be careful to note how the battery cable connects to the circuit board (the red wire is right next to the mounting post).

5. With the Mic2496 flat on a table top and the circuit board oriented so that the mic input jack is on the top of the right side:

6. Jumpers 7 and 8 are at the lower left of the mic input jack. They should both be installed, vertically, so that they are parallel to the back of the mic input jack.

7. Jumper 2, 3, 4 and 5 are beneath the mic input jack. All four should be moved to connect (horizontally) the two right pins in each row.

8. On the left side of the circuit board is the phantom power toggle switch. At its top right corner is Jumper 9: the jumper should connect both pins.

9. At its lower right corner is Jumper 10: disconnect this.

10. Under it is Jumper 12: install this jumper.

11. Carefully re-attach the battery cable, reassemble the top cover making sure the bottom sheet metal tab is in its slot, tighten the three top cover screws, re-attach the four retaining nuts, one flat washer and two knobs.

Now when you insert a fresh battery and flip the Phantom Power toggle switch up, the green P48V LED should come on.

TO DISABLE P48V PHANTOM POWER AND ENABLE HEB POWER

1. Remove the two level control knobs, inner and outer.

2. Carefully remove all of the small nuts on the shafts of the three toggle switches and the large nut and washer on the 5-pin microphone input jack.

3. Remove the three screws holding the top of the sheet metal chassis.

4. Carefully remove the top of the sheet metal chassis, being sure not to bend or stress the toggle switches as you remove the top. Be careful to note how the battery cable connects to the circuit board (the red wire is right next to the mounting post).

5. With the Mic2496 flat on a table top and the circuit board oriented so that the mic input jack is on the top of the right side:

6. Jumpers 7 and 8 are at the lower left of the mic input jack. They should both be removed.

7. Jumper 2, 3, 4 and 5 are beneath the mic input jack. All four should be moved to connect (horizontally) the two left pins in each row.

8. On the left side of the circuit boar dis the phantom power toggle switch. At its top right corner is Jumper 9: the jumper should be removed.

9. At its lower right corner is Jumper 10: connect this.

10. Under it is Jumper 12: remove this jumper.

11. Carefully re-attach the battery cable, reassemble the top cover making sure the bottom sheet metal tab is in its slot, tighten the three top cover screws, re-attach the four retaining nuts, one flat washer and two knobs.

Now when you insert a fresh battery and flip the Phantom Power toggle switch, the green P48V LED should not come on. The mic input jack now provides correct power for our High End Binaural microphone set (using DPA 4060 or 4061 capsules).

CONFIGURING FOR SONY PORTABLE DAT LEVELS

The AES/Sony jumper J2 is the one between the coax jack and the LEDs. As delivered, it's jumpered to the top two pins for AES-standard levels (0.5V p-p). Move the jumper to the two lower pins for the higher voltage levels required by the early Sony portable DAT recorders.

Reconfiguring Mic2496's Internal Jumpers for Very Low and Very High Sample Rates

As normally configured by Core Sound, Mic2496's two external sample rate selection switches select the following sample rates: 44.1, 48, 88.2 and 96 KS/s.

The left switch is labelled "48/96, 44/88" and the right one is labelled "X2, X1". When both switches are down, they select 44.1 KS/s. When the left one is up and the right one is down they select 48 KS/s. When the left one is down and the right one is up they select 88.2 KS/s. And when both are up they select 96 KS/s.

Internally, there are five jumpers (JP16, JP17, JP6, JP11 and JP13) that allow you select two other operating mode: 32/64 KS/s or 176.4/192 KS/s. When these modes are selected, the other sample rates can not be selected.

SELECTING 32 AND 64 KS/s MODE

Orient the Mic2496 circuit board so that the mic input jack is at the top right.

In normal operation, the two jumpers (JP16 and JP17) behind the 44/48 switch (the lower of the two switches) are removed. To select 32/64 mode, jumper JP16 and JP17 vertically. In this mode, the "X1,X2" switch selects 32 KS/s in the down position, and 64 KS/s in the up position.

SELECTING 176.4 AND 192 KS/s MODE

Orient the Mic2496 circuit board so that the mic input jack is at the top right.

Locate the two jumpers (JP16 and JP17) that sit behind (to the left of) the 44/48 sample rate switch (the lower of the two sample rate switches).

To the left of JP16 and JP17 is a three-pin vertically oriented header. This is JP6. In normal operation JP6 is jumpered across its two top pins.

Below JP6, just above the capacitor bank at the edge of the board, are two three-pin jumpers (JP11 and JP13). In normal operation these are both jumpered to their two right most pins.

To select 176.4/192 mode, jumper JP6 to its lower two pins, and both JP11 and JP13 to their left two pins.

In this mode, the "X1,X2" switch selects 176.4 KS/s in the down position, and 192 KS/s in the up position.

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