AudioRoundTable.com - RDF feed
type: channel
description: Audio advice and discussions with audiophiles and professionals. Free discussion forums, open to all and frequented by industry experts. Ask questions and get advice on stereos, speakers, hi-end amplifiers, pre-amps, home theater, tube hi-fi, turntables, vinyl, tweaks, music, films, video, DVDs and more.
items: SPL rating affected by horn?
items: Re: SPL rating affected by horn?

SPL rating affected by horn?
type: item
description: Hi all, Do different horns change the combined SPL of a compression driver horn combo? More specifically, does a narrower horn, say a 60 degree horizontal horn versus a 90 degree horizontal horn change the 1 watt at 1 meter SPL? Same compression driver. Since the narrower horn is concentrating the output energy, would it have a higher SPL measurement at 1 watt? If so, how much higher on average? Thanks, Tom
creator: tom-m
date: 2021-10-02T14:51:34-00:00

Re: SPL rating affected by horn?
type: item
description: That's exactly right. Horns with narrower patterns deliver higher SPL, and for exactly the reason you describe: Directivity. And horns that have non-uniform directivity change the response too. That's how horns with collapsing directivity increase on-axis SPL as frequency rises, partially or fully compensating for mass-rolloff. It's also why constant-directivity horns do not compensate for mass rolloff and need "CD equalization."
creator: Wayne Parham
date: 2021-10-02T15:16:38-00:00

Re: SPL rating affected by horn?
type: item
description: Thanks Wayne!
creator: tom-m
date: 2021-10-03T04:27:54-00:00