hello michelle; yes your voltage is good you must get a good treble and mid frequencies but if you want bass frequencies, you can replace that a pair of 100nf with 10uf 250v condenser on wiht serial of 560r resistor. this is ab class amplifier but you can use limiter circuit with this circuit. the limiter's operating principle is compares in/out frequencies and bad freuencies absorves them. Then; ve set up this circuit's bias voltage is 2 base between of 2 volts but ı can't see them nevertime. my friends saw this voltage. but the driver transistor never heats on bias voltage on normal. this -+70v is a bit high on a pair output transistor. you can use 50vdc on tests. At lastly ; ı see your circuit and ı like it you you do a good job. Keep in mind, if you use in subwoofers you sould don't use limiter because limiter absorbs pure sub frequencies.