Sealed UM-18 vs SVS PB1000 - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 20 Old 05-31-2020, 01:01 AM - Thread Starter
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Sealed UM-18 vs SVS PB1000

I currently have a dual SVS PB1000 setup and was wondering how much of an improvement 2x sealed UM-18 would make in a setup used only for home theater purposes. If anyone with comparable experience regarding this sort of upgrade can share their thoughts, I would be most appreciative. Thanks!
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post #2 of 20 Old 05-31-2020, 01:02 AM
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Why sealed and not ported? Also yes the UM-18 will be better.


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post #3 of 20 Old 05-31-2020, 01:15 AM
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Well I mean considering that a UM18 is equivalent to a XB16 Ultra (S or P) from SVS, idk it might make a small improvement.
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Leave it at 8 ohms and call it a day :)
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post #4 of 20 Old 05-31-2020, 01:33 AM
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Quote:
Originally Posted by chenjy9 View Post
I currently have a dual SVS PB1000 setup and was wondering how much of an improvement 2x sealed UM-18 would make in a setup used only for home theater purposes. If anyone with comparable experience regarding this sort of upgrade can share their thoughts, I would be most appreciative. Thanks!
1 UM18 is better than 2 of your sub. 2 x UM18 is going to be unreal in comparison. You're comparing a 300 watt 10" to a really good 18. Kinda silly to compare them.
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post #5 of 20 Old 05-31-2020, 06:55 AM
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I have a pb1000 and i'm currently DIY-ing 2x UM18 in sealed boxes. Not done yet, the second sub is on the way, and i might have money to get the nx4-6000 after that 10th next month.

I have 1 um18 build and is currently in use with an old 40w amp that actually makes more SPL than the pb1000. I haven't updated my build threads because of you know what =/. They had to be done 1 month ago, but ye.
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post #6 of 20 Old 05-31-2020, 08:17 AM - Thread Starter
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Quote:
Originally Posted by bogaboga View Post
Why sealed and not ported? Also yes the UM-18 will be better.
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Size. My mixed living room is rather clean minimalist and I would rather not introduce 2x behemoth subs into the environment. Thank you for the info!

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Originally Posted by Russdawg1 View Post
Well I mean considering that a UM18 is equivalent to a XB16 Ultra (S or P) from SVS, idk it might make a small improvement.
My primary concern was that I didn't know how much low end frequency and volume I would kill going from ported to sealed despite the fact that the UM18 is 8" bigger and should be a much better subwoofer. Thanks for the comparison!

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Originally Posted by SpinMonster View Post
1 UM18 is better than 2 of your sub. 2 x UM18 is going to be unreal in comparison. You're comparing a 300 watt 10" to a really good 18. Kinda silly to compare them.
In a vacuum, I know UM18 > PB1000's subwoofer. My concern was how much of that is lost going from port to sealed and going by the responses, it sounds like my concern is unwarranted. Thanks!

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Originally Posted by Quetzalcoalt View Post
I have a pb1000 and i'm currently DIY-ing 2x UM18 in sealed boxes. Not done yet, the second sub is on the way, and i might have money to get the nx4-6000 after that 10th next month.

I have 1 um18 build and is currently in use with an old 40w amp that actually makes more SPL than the pb1000. I haven't updated my build threads because of you know what =/. They had to be done 1 month ago, but ye.
Thank you for this awesome info as it answers my question perfectly!
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post #7 of 20 Old 06-01-2020, 04:57 PM
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Originally Posted by chenjy9 View Post
I know UM18 > PB1000's subwoofer. My concern was how much of that is lost going from port to sealed
I haven't looked at the data-bass charts in like a year, but I'd hazard a guess that the UM-18 is louder from 40hz up and from 13hz down...
Possibly louder at all frequencies...

Cone area is king when it comes to clean bass and loud bass.

Each 18 has like 3.5x the cone area of a 10, so the efficiency gain should be rather substantial.
Likely more excursion and power handling too, or better cooling!

The UM-18 is as-loud or louder than a sealed-up SVS-16, and it often matches or beats the Velodyne DD-18+ too, so it "should" be worth the upgrade.
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post #8 of 20 Old 06-01-2020, 05:04 PM
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Here you can see the response in my room between the 3 different subs i've had:

- BK XLS200
- SVS PB1000
- DIY 18" (BMS 18N862)



I'm not entirely sure i've used the same exact sound level in all those measures, as they were taken years apart, but i think i tried to use a similar level, each time i got a new sub.

As you can see, there is no comparison between the sealed 18" and the PB1000.

Its also interesting to check how similar the responses are, from a "shape" perspective, even with 3 completely different sub types
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post #9 of 20 Old 06-01-2020, 10:41 PM - Thread Starter
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Quote:
Originally Posted by BassThatHz View Post
I haven't looked at the data-bass charts in like a year, but I'd hazard a guess that the UM-18 is louder from 40hz up and from 13hz down...
Possibly louder at all frequencies...

Cone area is king when it comes to clean bass and loud bass.

Each 18 has like 3.5x the cone area of a 10, so the efficiency gain should be rather substantial.
Likely more excursion and power handling too, or better cooling!

The UM-18 is as-loud or louder than a sealed-up SVS-16, and it often matches or beats the Velodyne DD-18+ too, so it "should" be worth the upgrade.
Awesome, thanks for the info!

Quote:
Originally Posted by neo_2009 View Post
Here you can see the response in my room between the 3 different subs i've had:

- BK XLS200
- SVS PB1000
- DIY 18" (BMS 18N862)



I'm not entirely sure i've used the same exact sound level in all those measures, as they were taken years apart, but i think i tried to use a similar level, each time i got a new sub.

As you can see, there is no comparison between the sealed 18" and the PB1000.

Its also interesting to check how similar the responses are, from a "shape" perspective, even with 3 completely different sub types
This is really great data. I will proceed with ordering the boxes. Now I just need to figure out if I want to go passive or get a plate amp. Thanks everyone!
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post #10 of 20 Old 06-01-2020, 11:39 PM
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Don't buy plate amps for these drivers (unless it's SpeakerPower.)
I'd buy the nx6000D if I were you. Sealed needs DSP to flatten it below 30hz, and ported needs DSP to filter out deep infrasonic frequencies.

If you really want to overkill it, you could get a miniDSP and then either a Sanway FP14k or Smiths FP14k. You definitely won't be clipping those amps with those drivers. It will propel the driver to the moon and back.

A plate amplifier will just overheat and/or clip, most of them are horrible (for basshead purposes).
I've owned Velodyne Digital plate amps, and a LT/1300 plate amp, and a few others. I melted them all.

The FP clones are the ONLY amp I haven't been able to melt.
Clip yes, but not melt...
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post #11 of 20 Old 06-02-2020, 04:48 AM
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Agreed with Bass... Just go with a pro audio style 'rack' amp. It may seem annoying to have another piece of equipment hanging around at first, but it's worth it. You'll get better performance per price and you have the ability to easily swap it out if something every happens.

The behringer inuke/NX series amps are your best bang for your buck, but they are a bit loud with the factory fan setup, just a warning. Try to keep them away from your seating if you can. Luckily, decent length speakon cables are surprisingly cheap!
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post #12 of 20 Old 06-02-2020, 04:51 AM
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Try to keep them away from your seating if you can. Luckily, decent length speakon cables are surprisingly cheap!
or just make your own speakon with excess speaker cable you properly have.
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post #13 of 20 Old 06-02-2020, 09:47 AM
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I went from an SB-2000 to the Um18 in a sealed enclosure. Not sure I can still call the SB-2000 a subwoofer. It certainly fills i the bottom end nicely but not even close.

SVS-2000 = Subaru BRZ

Dayton UM 18 = Lamborghini Aventador

Both are sports cars but.....................................
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post #14 of 20 Old 06-02-2020, 11:09 AM - Thread Starter
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Speaking of SpeakOn, do I want to use a SpeakOn connector port and a cable that terminates to RCA?
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post #15 of 20 Old 06-02-2020, 12:26 PM
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Quote:
Originally Posted by chenjy9 View Post
Speaking of SpeakOn, do I want to use a SpeakOn connector port and a cable that terminates to RCA?
To RCA? No, SpeakOn is the output side. SpeakOn on both ends of 12Ga speaker wire.

I use this on the box: https://www.amazon.com/NL4MPR-Neutri.../dp/B00OVAX8KE
And these for the ends (also available in 90*): https://www.amazon.com/Neutrik-NL4FX.../dp/B002BERXW6
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Sub builds: Yet another Infinity 1260 build | Twins! | Modified V.B.S.S. build | UM12-22 builds | AV stand and sealed UM18s

Speaker builds: DIYSG HTM-10 build | DIYSG Volt-6 build | DIYSG Fusion-8 builds
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post #16 of 20 Old 06-02-2020, 12:47 PM
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I went form a very expensive Martin Logan sub to a 12" UM12 and even that single one waay outperforms the factory one at a fraction of the price. I am now building an 18" one.

EPSON TW-9300 in bat cave Anthem MRX-720 + 3xpower amps = 7.1.4, Martin Logan Motion 60XT fronts, ML FX rears, ML Motion 50XT centre, 4 x ML Motion 2 on ceiling Atmos, DIY Subs 18" 24hz tune and 12" 17hz tune Panasonic UB900, HTPC, etc..Epson LS10000 calibration and WCG SDR settings: https://www.avsforum.com/forum/24-di...l#post50298297
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post #17 of 20 Old 06-03-2020, 09:24 AM - Thread Starter
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Is the UM18 the best option or simply the best value for 18" drivers? This is strictly for HT purposes.

Last edited by chenjy9; 06-03-2020 at 09:28 AM.
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post #18 of 20 Old 06-03-2020, 11:04 AM
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Quote:
Originally Posted by chenjy9 View Post
Is the UM18 the best option or simply the best value for 18" drivers? This is strictly for HT purposes.
Neither - it's just a recommendation that's a good representation and value of a 'high excursion' 18" driver. There are better or cheaper drivers out there, for sure, and some builds may be better or worse suited for it. As an example, a PA460 is a 'pro audio' 18 that has a lot less excursion than the UM18, but is noticeably more efficient at mid to higher frequencies... it's also only $90-100.

Just gotta find one that fits your needs. For a reasonably sized sealed box, the UM18 is a good driver all around for your situation I'd say.
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post #19 of 20 Old 06-04-2020, 03:44 PM
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I was in a similar position as you a few years back. I have a pretty decent 7.4.2 atmos setup. I built two ultimax 18" subs with the Parts Express flatpack and the iNnuke 6000DSP, even did the neutrik connectors.

I was concerned, and skeptical, that they could really be as good as people say. After having gone through it all, let me just say this: These subs so significantly outperform every other aspect of my system that I can honestly say they're the only element of my setup that I'll probably never need or want to replace. If someone gave me $10,000 and told me to upgrade my HT, I'd use it all elsewhere and leave the subs alone.
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post #20 of 20 Old 06-04-2020, 04:14 PM
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Quote:
Originally Posted by chenjy9 View Post
Speaking of SpeakOn, do I want to use a SpeakOn connector port and a cable that terminates to RCA?
Here is probably the most accurate comparison you will see between the two subs you are asking about. One is a larger, more powerful SVS than yours, the PB12-NSD. The other is the UM18 in a small sealed box. Looks like +7-10 dB or so everywhere, a lot more under 20 Hz. So a little more of a difference than that for you.

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