2 Ported UM18s vs 2 Sealed HS 24s - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 16 Old 11-13-2019, 01:14 AM - Thread Starter
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2 Ported UM18s vs 2 Sealed HS 24s

Hey everyone,

currently considering to buy 2 HS 24s for my living room. I'd love to put them in sealed cabinets but I'm wondering if/how much of a gain/loss it'd be compared to two "JohnnySubs" with the UM18 22s I'm currently using. The box shouldn't be much bigger, that's why ported HS 24s won't work I guess.

I tried putting in the T/S parameters of the HS24 in WinISD to run the sim myself but I suck at it and somehow it's telling me I did something wrong.

What can I expect from a switch from the two ported 18s to two sealed 24s?
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post #2 of 16 Old 11-13-2019, 05:40 AM
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IMHO, if you can make the 24s fit, then do it...you won't be disappointed I've experienced both, albeit in different rooms and both ported, hands down my 2 24s murdered my two UM18-22.
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Automation: Alexa- Harmony Hub- Wemo Dimmer Switch- Wemo Smart Plug BatCave: SY Triple Black
Video Image: JVC RS500- Sony UBP-800X- Chromecast- 125" wide 16x9 white over black spandex screen
Audio: 5.2.4 Marantz SR7011- (LCR) Stage Right 15" PA- (Surrounds) (4) BIC FH6-LCR- (Atmos) (4) Dayton Audio B652 6-1/2-Inch- (Subs)2 23ishcuft ported HS24s 14-15Hz tune- 4 PA460 in ported cabs 40Hz tune- FP20000Q- 2 Sanway FP10000Q- Crown XLS1500- . To be continued...
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post #3 of 16 Old 11-13-2019, 06:02 AM - Thread Starter
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That sounds and looks awesome, although it wouldn't be 18 cuft but rather around 8 cuft, same as my ported Johnny's atm. How is it looking at that point?
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post #4 of 16 Old 11-13-2019, 07:36 AM
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In order to model a 2 sub setup, you have to double the box volume and select 2 drivers. So the model represents 2 9cuft sealed enclosures. Same goes for the Ported (Johnny Sub) enclosure in that model.

Automation: Alexa- Harmony Hub- Wemo Dimmer Switch- Wemo Smart Plug BatCave: SY Triple Black
Video Image: JVC RS500- Sony UBP-800X- Chromecast- 125" wide 16x9 white over black spandex screen
Audio: 5.2.4 Marantz SR7011- (LCR) Stage Right 15" PA- (Surrounds) (4) BIC FH6-LCR- (Atmos) (4) Dayton Audio B652 6-1/2-Inch- (Subs)2 23ishcuft ported HS24s 14-15Hz tune- 4 PA460 in ported cabs 40Hz tune- FP20000Q- 2 Sanway FP10000Q- Crown XLS1500- . To be continued...
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post #5 of 16 Old 11-13-2019, 07:37 AM
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Did you model the UM18 to have 28mm of x-max. Max spl will only go to the stated x-max and if that is 22 then it is low.

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Last edited by MKtheater; 11-13-2019 at 07:41 AM.
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post #6 of 16 Old 11-13-2019, 07:43 AM - Thread Starter
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Quote:
Originally Posted by MKtheater View Post
Did you model the UM18 to have 28mm of x-max.
Me? Yeah, I put the 17 Hz HPF in, otherwise it'd reach Xmax at that point.

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Originally Posted by johnson636 View Post
In order to model a 2 sub setup, you have to double the box volume and select 2 drivers. So the model represents 2 9cuft sealed enclosures. Same goes for the Ported (Johnny Sub) enclosure in that model.
So you put it in for the Johnny's as well as the HS 24s? Thank you!
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post #7 of 16 Old 11-13-2019, 07:48 AM
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What tune and size is the Johnny sub?

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post #8 of 16 Old 11-13-2019, 07:49 AM
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I used a driver file from the batch of file that mtg90 posted a while back. 22mm was listed for the driver. I used 28mm for the model below. Johnny Sub is tuned to 18.5hz and 7.5cuft
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Automation: Alexa- Harmony Hub- Wemo Dimmer Switch- Wemo Smart Plug BatCave: SY Triple Black
Video Image: JVC RS500- Sony UBP-800X- Chromecast- 125" wide 16x9 white over black spandex screen
Audio: 5.2.4 Marantz SR7011- (LCR) Stage Right 15" PA- (Surrounds) (4) BIC FH6-LCR- (Atmos) (4) Dayton Audio B652 6-1/2-Inch- (Subs)2 23ishcuft ported HS24s 14-15Hz tune- 4 PA460 in ported cabs 40Hz tune- FP20000Q- 2 Sanway FP10000Q- Crown XLS1500- . To be continued...

Last edited by johnson636; 11-13-2019 at 07:53 AM.
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post #9 of 16 Old 11-13-2019, 07:57 AM
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What size box is that enclosure, the UM18 wanted over 20 cubes for me(tuned to 15hz). I guess it really does not matter.

I would get the sealed 24 anyways even over 4 UM18s. Why? Ever since I bought a higher quality driver it just has more ULF and feel over even 4 lower x-max SI drivers. The 24 is a high quality driver and IMHO the best HT driver one can buy right now. 2 of those sealed will rock your world and get all but the largest rooms reference bass. I never tried the UM18 but many have stated that can't tell that apart from the SI 18HT that was so popular which I had 12.

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post #10 of 16 Old 11-13-2019, 07:59 AM
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Quote:
Originally Posted by johnson636 View Post
I used a driver file from the batch of file that mtg90 posted a while back. 22mm was listed for the driver. I used 28mm for the model below. Johnny Sub is tuned to 18.5hz and 7.5cuft
I use his files as well, great source of info. Depending on driver I model based on how the x-max was taken. For pro drivers like the Ipal and such, I use the 22mm because they were measured the same to achieve the x-max.

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post #11 of 16 Old 11-13-2019, 11:05 AM
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I've heard both (2) UM18 marty's and I have (3) of the HS24s. I've done testing with just the 2 at the front of the room. The UM18s were at a friends house. Completely different areas, but both are open to the rest of the house, so not in dedicated rooms. The UM18s put out some good bass, but the 24s are on another level. You won't be able to touch what the 24s can do with subsonic frequencies. I vote 24s if you can swing it

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post #12 of 16 Old 11-13-2019, 12:21 PM - Thread Starter
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Quote:
Originally Posted by blister64 View Post
I've heard both (2) UM18 marty's and I have (3) of the HS24s. I've done testing with just the 2 at the front of the room. The UM18s were at a friends house. Completely different areas, but both are open to the rest of the house, so not in dedicated rooms. The UM18s put out some good bass, but the 24s are on another level. You won't be able to touch what the 24s can do with subsonic frequencies. I vote 24s if you can swing it
Your videos basically made me consider the 24s in the first place. What exactly is the difference you're describing when you're talking about "subsonic frequencies". Is it the tactile feeling? Does it sound better, louder? How would you describe it?
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post #13 of 16 Old 11-13-2019, 12:39 PM
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Originally Posted by johnson636 View Post
I used a driver file from the batch of file that mtg90 posted a while back.

What thread was that? That would be very useful info. Thanks.
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post #14 of 16 Old 11-13-2019, 01:10 PM
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2 Ported UM18s vs 2 Sealed HS 24s

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What thread was that? That would be very useful info. Thanks.
https://www.avsforum.com/forum/155-d...isd-files.html

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post #15 of 16 Old 11-13-2019, 01:19 PM
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Quote:
Originally Posted by Vossten View Post
Your videos basically made me consider the 24s in the first place. What exactly is the difference you're describing when you're talking about "subsonic frequencies". Is it the tactile feeling? Does it sound better, louder? How would you describe it?
Haha glad I could help I think overall everything is louder, but I also tuned my system to be that way. Just physics though, there's a lot more air being moved. I'm on a concrete subfloor and the couches are still shaking pretty good, so there's definitely a good sense of tactile bass even with them across the room. My room has rattles with a lot of frequencies with it loud enough (I really need to go through my basement and secure/adjust things so they don't rattle!) but the subsonic frequencies are crazy. My doors start flapping in their frames, my 80 pound dart board starts slapping the wall... Pretty crazy output down low. As far as sound differences, I don't know how to describe it besides being a more full and natural sound with the larger drivers. Like they aren't struggling to cause an earthquake in my basement powerful enough to trip seismic meters across the midwest But joking aside, they are pretty awesome. If you get them you won't regret it
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post #16 of 16 Old 11-13-2019, 03:46 PM
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Thanks Chris!
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