Reset my blackspur safe es100 after putting in new batteries

Oxy-acetylene.

You're going to have to cut your way into it, I'm afraid.

If you leave it for a week or so, the batteries MAY just have enough charge to open the safe once more.

Some can be reset and some cannot. You must provide a make and model number for further assistance.

http://www.alibaba.com/showroom/aa-battery-r6p-1.5v.html

setting Crossover frequency is trying to find the best frequency where the sub will see below that frequency and the es100 will see above that set frequency for maximum speaker efficiency.

8400P, i believe has a adjustable crossover frequency or cut frequency from 50-150Hz.

The e100 has a rated frequency response of 32Hz to 40kHz. So, the lows going to the sub, will allow the es100 to not have to handle deep bass frequencies.

So, I would suggest starting at 100Hz. That would mean your sub will be seeing roughly 100Hz and down, and the es100 will see roughly 100Hz and up.

Listen to your favorite music, and adjust accordingly.

Blackspur BB-ES100 How to reset the code. Have the key

Check batteries and replace, also make sure contacts for batteries in the safe are clean and not correded with rust, if so rub with sandpaper and clean up.

try to remove the battries for about 3 min. then put new ones and try it may work...let me know
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I had a similar problem with my Kenmore and it was the Igniter. Cost me about $85.00 for a new one. Sometime on the back of the range there is a little pocket where sometimes a schematic is there and ( I don't know about your Frigidaire) but with my Kenmore it gave troubleshooting info that was very helpful in determining the problem.