3106 Network

[ngccglp]

Hi,

1. Does anybody know what impedance drivers (low and high) is the 3106 designed for? Are they meant for both 16 ohms drivers?

2. Is the effective impedance 8 ohms after connecting to a 16 ohms low and high freq driver?

3. Also, is the similar N7000 effective impedance 16 ohms? Is there a mod I can do to make it 8 ohms?

Thanks.

[remusr]

2000/04 JBL Pro Component Listing shows the 3106: 8000Hz, for 16 ohm LF & 16 ohm HF, 50W(OBS). Note that LF here is usually a midrange unit.

Since the xover parallels each 16ohm driver with a 20ohm resistor, and the HF with an LPad as well, the load should be 9 ohms +/-. For feed to these 2 drivers that is - the real LF (woofer) load would be in parallel so would expect that to be 8ohms +/- to be consistent.
- Roy

[Zilch]

1979 instructions say 12-16 Ohms for both LF (MF) and HF for both 3105 and 3106.

3105 is "Optimized for the 2440 driver." 3106 is "Optimized for the 2410 and 2420 drivers."

1986 instructions no longer include 3106, but say 16 Ohms LF (MF) and 8 Ohms HF with 3105

Then, 3105 is "Optimized for a single 2402H, 2404H, or 2405H tweeter installed in a system with any 16 ohm JBL compression driver."

Fact is, I believe, neither the circuit nor the actual tweeter impedances changed.

I've always followed the '86 instructions and used "J" drivers for the MF, ignoring whatever the tweeter foilcal says....

http://audioheritage.org/vbulletin/showpost.php?p=62922&postcount=51

1968 catalog says N7000 has an input impedance of "4 to 16 ohms," and "Permits adding 075 to extend treble range of any high-quality two-way system."

Measure.

[4313B]

http://audioheritage.org/vbulletin/showthread.php?p=3051

[ngccglp]

Thanks guys.

I wanted to use the N7000 to add the 2405 to the 288-16G Altec driver, but the crossover I'm using with my VOTT is the N501-8A which is a 2-way 8 ohm crossover, meant for 802-8D 8 ohm compression drivers. To make sure the crossover freq remains at about 500 hz, I thought the impedance of the N7000 (after connecting the 288 and 2405) needs to be around 8 ohms.

I saw JBL catalog lists the N7000 as 16 ohms impedance, and the schematic for the 3106 list it as 8 ohms. I'm just wondering if I could add the 20 ohm resistors in parallel to convert the N7000 to 8 ohms thereabout, similar to the 3106.

Is this possible?

Thanks

[Dr.db]

I saw JBL catalog lists the N7000 as 16 ohms impedance, and the schematic for the 3106 list it as 8 ohms. I'm just wondering if I could add the 20 ohm resistors in parallel to convert the N7000 to 8 ohms thereabout, similar to the 3106.


In other words; could I eliminate the 20ohm resistors in the 3106 (N8000) and it would turn out to be 16ohms like the N7000 ?