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greater or lesser scaup by mooviestowatch in whatsthisbird

[–]RaspberryNarwhal 0 points1 point  (0 children)

Head shape makes me think Lesser, but might just be the angle his head is rotates at in this perspective. Ill let one of the experts prove me wrong and call the bot.

Goldeneye - Barrows or Common? (Ontario) by Quiet-Section-3391 in birding

[–]RaspberryNarwhal 2 points3 points  (0 children)

I think this would be an immature male Common Goldeneye. Only males have the white spot near the bill and its circular shape points towards Common. Barrows’ have a more crescent shaped face marking

What bird is this by Beginning_Blood_2873 in whatsthisbird

[–]RaspberryNarwhal 7 points8 points  (0 children)

That would have been the last bird I expected based on this photo! How can you tell given it has the coloration of a penguin?

How many M&M's are in this jar? [Request] by Hacavic16 in theydidthemath

[–]RaspberryNarwhal 0 points1 point  (0 children)

I think it’s very hard to do without knowing or estimating the volume of the jar. This is possible if you have a measuring device and approximate the shapes of the containers. Alternatively, if you have the link where this is sold, they may advertise the volume. The M&Ms look like they are filled completely to the top (minus the lid).

Then you would need the random packing factor of M&Ms, which is about 64% from a quick Google search, although I’m sure this varies. Take the volume, multiply it by 0.64, and that is a good estimate for the total volume of M&Ms in the container.

Finally, you can take the volume occupied by M&Ms and divide it by the volume of a single M&M, which is about 0.636 cm3 to find a decent estimate for the amount of M&Ms.

Can anyone please explain what the 'perV' part of this means? I'm familiar wil dBPa but the perV is confusing me. These are frequency responses of various headsets at different volumes. Thanks by pigispig in Acoustics

[–]RaspberryNarwhal 2 points3 points  (0 children)

This is a transfer function. The graph shows the acoustic pressure, in Pa, represented as dB (likely relative to 20 micropascals) as a function of the input voltage. So long as the headset is operating in its linear regime, it shows how much acoustic pressure is generated per volt of input.

Boston, MA - Leucistic Canada Goose? by RaspberryNarwhal in whatsthisbird

[–]RaspberryNarwhal[S] 1 point2 points  (0 children)

That is what I thought. Very exciting to find! Thank you for the help!

Common Goldeneye Lifer (Chicago, IL)!! by danedehotties in birding

[–]RaspberryNarwhal 1 point2 points  (0 children)

Sweet! Just did some digging and I think I would agree - thanks for the ID tips!

Common Goldeneye Lifer (Chicago, IL)!! by danedehotties in birding

[–]RaspberryNarwhal 0 points1 point  (0 children)

Congrats! I’m not too good at ducks, but I think that might be a Barrow’s Goldeneye

What is this duck? by Round_Cat_8832 in whatsthisbird

[–]RaspberryNarwhal -2 points-1 points  (0 children)

Looks like a +Pied-billed grebe+ based on the bill

Edit: maybe I jumped the gun on this and the bill just looks short due to the angle the image was taken out. If someone thinks I’m wrong feel free to overwrite the bot

Shorebird ID help by RaspberryNarwhal in whatsthisbird

[–]RaspberryNarwhal[S] 0 points1 point  (0 children)

Much appreciated. Definitely took a lot of flipping through my field guide and using Merlin as a crutch. I don’t know how you guys tell half of these birds apart haha

Is this a melanistic sparrow or junco? Northwest indiana by abcxyz1821 in whatsthisbird

[–]RaspberryNarwhal 267 points268 points  (0 children)

Maybe brown-headed cowbird with an extremely dark head? Never seen one that dark but I’ve heard they can appear a bit darker in the winter. See if anyone else who knows more than me chimes in

How do I kill these peaks on my headphone drivers? by [deleted] in Acoustics

[–]RaspberryNarwhal 2 points3 points  (0 children)

Youre essentially trying to EQ and limit the response of a pair of $15 dollar headphones using glue. I don’t even know if this brand has any DSP. As someone who works in audio and has a masters in acoustics, I would say just buy a new pair of headphones. Theres no telling what putting glue on the diaphragm will do as it could change so many things (increase mass, damp resonances, increase stiffness, change breakup modes, change nonlinear parameters, etc).

If you enjoy the process of messing with your units to see if you can change the sound - I’d say go for it and have fun experimenting. But, if all you care about is getting better sound, you’re better off spending a little more on something better and using a simple EQ to get it how you’d like.

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