Sound By Design managing director Andy Callin and Delta managing director Paul Keating first discussed the deal 15 months ago.
"We met at a party in Dubai neither of us had been invited to," said Callin. "We had already come to the conclusion that it was what we wanted to do before the market started to contract in some areas."
"We have been looking at sectors away from our traditional ones and the venue market is something that has interested us over the past couple of years," added Keating.
Sound By Design is accredited at the Royal Albert Hall, where it has been an in-house supplier since 1993.
Both companies will operate from Delta's current HQ near Hampton Court in Surrey, with Sound by Design scheduled to join them there by 1 October.
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