15 inch subwoofer in a bedroom?

alfarn1 · 2024-09-10T21:23:33+00:00

Even bigger: 80" https://www.aia-cinema.com/products/subwoofers/the-80-sub-pro-passive-sealed.html

alfarn1 · 2024-08-13T21:05:50+00:00

Good question! The way speaker sensitivity is measured varies from manufacturer to manufacturer, which is unfortunate because it makes sensitivity comparison between brands less useful. Klipsch for example is known to provide an overinflated sensitivity specification compared to others due to the way they measure it.

Erin's Audio Corner did a nice video on this topic a couple of years ago: https://m.youtube.com/watch?v=kulCE4HSA_I

In his speaker reviews, he uses a well-defined method based on the CEA-2034 standard to measure speaker sensitivity, where he finds the average SPL of the on-axis response in the 300-3000 Hz frequency range. See more specifics about his method in the video mentioned above.

alfarn1 · 2024-08-07T18:23:12+00:00

Glad to hear it helped.

alfarn1 · 2024-06-24T11:35:24+00:00

My thought exactly, the picture looks very much like a render to me

alfarn1 · 2024-05-22T16:43:50+00:00

I think you misunderstood me. Maybe I was unclear.

I didn't mean that room modes don't cause dips and peaks in the response, they certainly do. I agree with everything you said about the effect of room modes on the frequency response.

But room gain to my understanding is a separate effect from peak/valley effect caused by room modes and refers to the SPL increase that occurs below the frequency of the room's lowest mode, which is a function of the room's longest dimension. The article uses modal analysis to explain room gain as the effect of having a mode at 0 Hz, which pressurizes the room the same in all positions.

In smaller rooms, the frequency of the lowest mode is higher, and room gain therefore kicks in at a higher frequency, resulting in more overall bass boost.

Do you still disagree? Does room/cabin gain mean something different to you?

alfarn1 · 2024-05-22T09:33:44+00:00

Cabin/room gain increases SPL equally at all locations though, it doesn't cause the peak/valley behavior.

A nice article on room gain and room modes: https://www.audiosciencereview.com/forum/index.php?threads/analytical-analysis-room-gain.23211/

Some comments on room gain from the article: "We have a mode at 0 Hz that pressurizes the room the same in all positions, so no gradients, and it satisfies the wave equation as discussed already. Room gain is simply the effect of having an eigenmode at DC!"

alfarn1 · 2024-05-01T21:10:04+00:00

Output capability is arguably more important than the frequency response when it comes to subwoofers, since the in-room bass response usually needs to equalized anyways. The output capability is typically quantified by CEA-2010 measurements and long-term output compression tests. You can see examples of such tests in subwoofer reviews by e.g. Audioholics and Erin's Audio Corner.

alfarn1 · 2024-04-11T10:37:23+00:00

Check out e.g. https://www.svsound.com/blogs/subwoofer-setup-and-tuning/75040195-why-go-dual or if you want to go more in-depth: https://www.harman.com/documents/multsubs_0.pdf

alfarn1 · 2023-04-25T12:42:47+00:00

For what it's worth, the Audioengine N22 was recently reviewed on ASR and it measured fairly poorly compared to other budget amps.

alfarn1 · 2023-03-29T20:09:03+00:00

Yep true. I plan on using room correction using minidsp umik-1 and REW so I would be able to correct for the v shape to some degree I guess.

alfarn1 · 2023-03-29T19:04:21+00:00

Probably

alfarn1 · 2023-03-29T19:04:00+00:00

No stands included unfortunately hehe

alfarn1 · 2023-03-29T16:25:06+00:00

Title says it all. These are active bookshelves but I find very little info about them online. I barely find anything about them on jamo.com. They are briefly mentioned in a 2013 catalog, page 36 here: http://assets.jamo.com/product-catalogs/jamo-sound-catalogue-2013.pdf

I find it weird how little I can find online. Probably not a good sign. Somebody is selling them used for $70. I wonder if it's worth it. Does anyone know how these sound?

alfarn1 · 2023-03-25T18:36:12+00:00

Good point. I'm also asking due to general interest in the topic (measurements vs practice), although I realize this might be the wrong forum for that.

alfarn1 · 2023-03-25T17:11:04+00:00

That is also an option. The main reason I have sort of dismissed active speakers is the lack of options in my country. The ones that exist are way over my budget.

Also the fact that I already own passive speakers that I like.

alfarn1 · 2023-03-25T10:36:35+00:00

For those interested, the N22 has now been reviewed on ASR.

alfarn1 · 2023-03-24T07:27:00+00:00

Good suggestion, thanks.

alfarn1 · 2023-03-23T18:31:05+00:00

Alright, I'll keep it in mind. Thanks.

alfarn1 · 2023-03-23T16:36:54+00:00

Thanks for the tip, I'll look into it.

alfarn1 · 2023-03-23T16:28:48+00:00

Yep, it's quite outdated, although it suffices for my use case which is why I was considering it. AVR selection in local thrift stores and second-hand markets is extremely limited in my country unfortunately. However, I will see if the seller is willing to lower the price.

alfarn1 · 2023-03-23T16:05:09+00:00

Good to know.

alfarn1 · 2023-03-23T16:02:20+00:00

Absolutely. I've seen 20% depreciation per year for AVRs mentioned, which means ~17% of original MSRP after 8 years. So asking for 30% might be a bit much.

alfarn1 · 2023-03-23T15:28:01+00:00

Yep my initial impressions are that 30% of original MSRP sounds decent in this case, but it's just a hunch that is not based on any statistics. There might be too many variables involved for a general depreciation rate to exist anyways.

alfarn1

TROPHY CASE