hello everyone I have problem with my nakamichi bx-1 tape deck it is 2 head system.
with following problem topics.
1. left channel has a louder than right channel after recording. (it same with new cassettle)
2. how to adjust bias.
i don't have any tools to calibration a tape deck.
can should i do
(i apologise for broken english)

please suggest best mic for room treatment calibration.