Dampening in Tapped Horns??

[atilsley]

I'm interested in knowin if people use dampening in tapped horns? Any ideas appreciated.

I'm building the large 2.2meter horn.

Andrew.

[Petter Persson]

I've got a stripe (15*200 cm) from a polyester sheet hanging
loose in the second part (half -> mouth) of my tapped horns,
single fold, 400 cm. It made the bass tighter and more defined
than without damping.

[atilsley]

Thanks Petter

What do you mean, polyester?

[Don Snyder]

Go to:

Dual 8" tapped horn = TH-SPUD

Polyester fiberfil is a spun plastic material commonly sold in sheets or bulk. Used as insulation or sound control,
it works like fiberglas, but without the irritation.

The main problem with dampening, is how much do you need, and where do you need it. This is often a cut-and-try
process, and doesn't model well.

[atilsley]

Thanks Don...that's a good link.

I'll give the horn about 1/3 stuffing based on what I've read.

For my TH (the long 2.2m version), I'll have one entire side with a removable pane. Probably use that awful black head-gasket for a sealing agent....but may not even need that for he initial evaluation stages. Thoughts? Perhaps a simple dry cork or foam might be better...less messy.

[Moondog55]

Better stuff at Clarke Rubber,
buy a few meters of the soft round- section foam they sell as filler for brick-work and sealing around door jambs, it is cheap and reusable and available in sections from 3mm to 45mm.
i can't think of the term for it at the moment, blame the brain cloud

[atilsley]

Thanks

Just vsited Clarke & Rubber...but bough the polyfill from Spotlight. I'll try that first.

Cheers.

[atilsley]

Just spent 8 hours building the horn. It's up and running.

Talk about OVER KILL. The thing can't get past 1/10 volume on the (600-watt) amp.

Heaps of room mods to attend to due to vibration etc. This unit is better suited to a small theatre rather than a lounge room. (Wife just got home from work to see what's happened to the lounge.....not impressed. My Lowther Big Fun Horns now look.....puny!)

I tried Madonna - Dick Tracy soundtrack...with the plate amp on only...and no stereo amp....a good way to test the sub.

The house just shook....hardly pleasant....but very effective.

I'm learning about the importance of integrating bass with mids/highs....it's hard work!

I think I should build the 30Hz smaller horn...half the size.

[Moondog55]

When you say 2.2meter do you mean 1/4 wavelength 2.2M or that the units are 2.2M tall, I'm still trying to get my head around tapped horns.

I have a pair of Cerwin Vega 124's that would probably work; but I'm not that willing to experiment just at the moment.
Also I don't ATM have a couple of 1000Watt amps

[atilsley]

2.2m tall...horn path is twice that....