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post #181 of 258 Old 04-24-2018, 01:04 PM
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My added holes.
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post #182 of 258 Old 04-24-2018, 01:11 PM
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Quote:
Originally Posted by Buddylee123 View Post
Will the Jasper 200J Model 200 Circle Cutting Jig work for 18-inch subs? I might do an insert mount but not sure yet.
The answer is yes, if you drill an additional hole(s). Just makes sure you drill nice and straight so the pin will remain tight in the new hole; I used my handy Gator drill guide to help. Once done, I just used a red Sharpie and circled and labeled the new hole for HT18 in my case.

https://www.amazon.com/Gator-Tools-S.../dp/B0061FY004

Inserts are not necessary and you can run into issues where you don't have enough material left on the rim next to the woofer cutout to really hold the insert. As long as you have something to bite into, like plywood blocks under the rim (assuming you are using MDF), beefy wood screws will do just fine. When I recently re-did my curvy subs (and completed them), I picked up some of these from Woodcraft. They look great and are sized perfectly.

https://www.woodcraft.com/products/1...xide-100-piece
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post #183 of 258 Old 04-24-2018, 01:43 PM
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Quote:
Originally Posted by dtsdig View Post
The answer is yes, if you drill an additional hole(s). Just makes sure you drill nice and straight so the pin will remain tight in the new hole; I used my handy Gator drill guide to help. Once done, I just used a red Sharpie and circled and labeled the new hole for HT18 in my case.

https://www.amazon.com/Gator-Tools-S.../dp/B0061FY004

Inserts are not necessary and you can run into issues where you don't have enough material left on the rim next to the woofer cutout to really hold the insert. As long as you have something to bite into, like plywood blocks under the rim (assuming you are using MDF), beefy wood screws will do just fine. When I recently re-did my curvy subs (and completed them), I picked up some of these from Woodcraft. They look great and are sized perfectly.

https://www.woodcraft.com/products/1...xide-100-piece
That's a cool guide, think I'll get one. I'm really leaning towards just doing a flush mount with the subs. I just don't think it's worth the extra hassle to recess mount them.
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post #184 of 258 Old 04-24-2018, 01:58 PM
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Quote:
Originally Posted by Buddylee123 View Post
That's a cool guide, think I'll get one. I'm really leaning towards just doing a flush mount with the subs. I just don't think it's worth the extra hassle to recess mount them.
I may be wrong, but I understand there are acoustic implications to not mounting the rim of the driver flush with the baffle surface. Maybe others who know can jump in here.
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post #185 of 258 Old 04-24-2018, 02:16 PM
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but I don't recall ever hearing of FU Audio before.
I hadn't either so I reached out to him via Facebook and started a discussion; planted a seed about how we think there's a market for these 18s nobody can get anymore or don't want to wait 6 months for. He's going to look at what he has available and follow up in a week. I specifically asked for estimated T/S parameters.

Can't hurt to try, right?
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post #186 of 258 Old 04-24-2018, 02:27 PM
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Originally Posted by frankwp View Post
I may be wrong, but I understand there are acoustic implications to not mounting the rim of the driver flush with the baffle surface. Maybe others who know can jump in here.
A non-issue in the subwoofer passband.
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post #187 of 258 Old 04-24-2018, 02:31 PM
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Quote:
Originally Posted by frankwp View Post
I may be wrong, but I understand there are acoustic implications to not mounting the rim of the driver flush with the baffle surface. Maybe others who know can jump in here.


Yes for higher frequency applications where the wave produced is the size of the baffle, like a mid or tweeter. No for a sub because a subs waves are very long. You can surface mount or flush (set in) and it makes no difference at subwoofer frequencies.
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post #188 of 258 Old 04-24-2018, 04:41 PM
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Quote:
Originally Posted by johnson636 View Post
It appears to be two threads discussing the FI HT drivers now. Hopefully a 3rd or 4th won't be started as it will be difficult to follow along
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Originally Posted by filtor1 View Post
I made the Fi specific thread so this thread, about all alternatives to the Ultimax, could remain on track.

Here is the thread about the Fi Car Audio drivers (sounds like "Scott" is the guy at Fi who people have been in contact with).

https://www.avsforum.com/forum/155-di...fer-lines.html

Thanks for starting the thread, @filtor1 , I just wanted to drop the link in here to make it easier for others to find. Once it drops down the list a ways it's easy to lose track of.
Looking forward to seeing updates there about those drivers. Just a thought - it would be nice to include the specs and T/S params that eng is using to graph those FRs in that thread. And any other important info.
I'll try to post something there.

And thanks to @Buddylee123 for getting all the info and liaising with Scott/Fi and keeping us updated here on any developments and new info.
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post #189 of 258 Old 04-24-2018, 06:53 PM
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Well to be fair to Buddylee123, he was the one in contact with Scott of FI and he was reporting information in regards to the new HT line of subwoofers. He also stated he'd start a thread once Scott gave him the word that the new drivers were ready for ordering.
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post #190 of 258 Old 04-24-2018, 06:57 PM
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Quote:
Originally Posted by corradizo View Post
Yes for higher frequency applications where the wave produced is the size of the baffle, like a mid or tweeter. No for a sub because a subs waves are very long. You can surface mount or flush (set in) and it makes no difference at subwoofer frequencies.
Thanks corradizo, that's good to know.
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post #191 of 258 Old 04-24-2018, 08:01 PM
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Quote:
Originally Posted by johnson636 View Post
Well to be fair to Buddylee123, he was the one in contact with Scott of FI and he was reporting information in regards to the new HT line of subwoofers. He also stated he'd start a thread once Scott gave him the word that the new drivers were ready for ordering.
Sorry, I definitely didn't mean to downplay Buddylee's efforts in this thread. I just highlighted filtor since he had bought drivers from Fi and built cabs with them already. And the info in this thread about Fi is so spread out, I thought his thread would be more valuable if the info was compiled a bit.
There is some data already posted in this thread, mostly by Buddylee, and I thought it ought to be posted in the other thread too. Even though the drivers aren't ready for ordering, I think that other thread can be valuable to "build some hype", spread the word and get folks around here thinking about that option when it becomes available.
It might be good to post reminders that the specs and prices are certainly not final.

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post #192 of 258 Old 04-25-2018, 02:38 PM
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I hadn't either so I reached out to him via Facebook and started a discussion; planted a seed about how we think there's a market for these 18s nobody can get anymore or don't want to wait 6 months for. He's going to look at what he has available and follow up in a week. I specifically asked for estimated T/S parameters.

Can't hurt to try, right?
Definitely can't hurt. I have been talking with Mr. Frank You as well, mostly about the 750 series. While he says that he believes the 18 incher itself would "probably surprise me" used in a home theater application as is, he also made it sound that some amount of customization is possible to better suit needs. He didn't elaborate on how much customization can be had though. He also said he looked at the specs of the UM18 and believes he could also make a driver with similar performance but it would probably be based on their 1250 series and would also end up costing about the same as the UM18. This gives us another option but I have a feeling that someone would have to take a leap of faith and go ahead and place an order through them before making such a driver. Then how would it get tested so we could get the T/S specs? I will have to ask the question. But the 750 series at $200 is tempting. I have not been able to get WinISD to work on my new laptop for some reason so someone else will have to do some modeling to get an idea of performance.

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post #193 of 258 Old 04-26-2018, 06:52 AM
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I know I guy... (eng-399) who has DATS v2 and used it to test my 18s before designing my boxes for my PSI 18s, and the specs came out to similar to what PSI tested right before the drivers were shipped. From there of course WinISD comes in to play to calculate best scenarios.

They should be able to give a scientific estimate on T/S values before any sort of customization is done; they know the parts going into the driver. However, in the end it will come down to real life testing and application, and that risk is borne by the buyer. I already took that chance with my PSIs and will realize the end-results in a few weeks. I can tell you that I'm not worried about the performance at all. The custom 12s PSI built for me 2 years ago get me 127dB flat to 17Hz, and that was before I knew half what I know now about drivers; and much to learn I still have.



I'm not expecting another value sub like the HT-18 to return again any time soon, much less these smaller American-made sub builders to ever to compete with a >$200 price tag, but certainly have much hope for the $300 level.
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post #194 of 258 Old 04-26-2018, 07:21 AM
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[I] The custom 12s PSI built for me 2 years ago get me 127dB flat to 17Hz, and that was before I knew half what I know now about drivers; and much to learn I still have.
Are you saying you had a pair of 12s that output 127db measured at Seating position? Close mic? Ported? Sealed? Man that's incredible!

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post #195 of 258 Old 04-26-2018, 07:59 AM
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Weeeell.. let me clarify before I get myself into trouble.

Back in October eng-399 performed some measurements I peaked on his UMIK 126dB.

After Christmas I got myself my own UMIK and REW and spent a few hours messing around with sweeps and got the response flattened out a lot more. I sure wasn't 127dB down in the teens, but I did peak it once during John Wick club scene. That's the iNuke6000DSP on full, giving the 12s everything it had.

Of course, these are 1500w subs with 28mm Xmax. Car audio subs built to take daily SPL thrashings; plenty of YouTubes with guys hitting 140dB in their cars with a single 12... so surely with a softer suspension and lower Fs a pair of them in 4 cubes @ 19Hz should get me solidly into the 120s, right? Mic was at seating position; door closed, in my small 13x14 room-within-a-room space.
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post #196 of 258 Old 04-26-2018, 08:21 AM
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I'm just saying 127db flat to 17Hz with a pair of 12 in a room is astonishing.

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post #197 of 258 Old 04-26-2018, 03:07 PM
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I'm just saying 127db flat to 17Hz with a pair of 12 in a room is astonishing.
I question those numbers.
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post #198 of 258 Old 04-27-2018, 11:23 AM
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How do you guys think the new HT1 would perform in the Stonehenge from DIYSG?

FS 20.9Hz
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post #199 of 258 Old 05-02-2018, 05:29 PM
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Hey guys I just heard back from FI car Audio and they said one more month for the HT line of drivers there still finishing up all there Oem orders.
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post #200 of 258 Old 05-02-2018, 06:34 PM
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Really cant wait to get specs and price on a 15"
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post #201 of 258 Old 05-02-2018, 06:59 PM
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Now i am debating wheather or not to cancel my ultimax 18 and wait for these. Decisions decisions lol
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post #202 of 258 Old 05-03-2018, 10:22 AM
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Now i am debating wheather or not to cancel my ultimax 18 and wait for these. Decisions decisions lol
Let them make it for you, when they move the back order date again....
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post #203 of 258 Old 05-03-2018, 12:47 PM
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Let them make it for you, when they move the back order date again....
Nah, the current restock date has been confirmed to me via email from them.
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post #204 of 258 Old 05-03-2018, 02:03 PM
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Unless this batch is defective too......


Made in china VS made in USA about the same performance, about the same price and possibly recone-able....I know where my money will go.

Nothing wrong with the UM-18, its a solid choice and a known performer........but it looks like we have a contender for that spot, that appears on paper so far will be a winner.

Link to Stereo Integrity SI HT 18 sub build......https://www.avsforum.com/forum/155-di...-pedestal.html
Speakers and subs for sale...https://www.avsforum.com/forum/209-au...kers-subs.html

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post #205 of 258 Old 05-03-2018, 04:03 PM
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Unless this batch is defective too......


Made in china VS made in USA about the same performance, about the same price and possibly recone-able....I know where my money will go.

Nothing wrong with the UM-18, its a solid choice and a known performer........but it looks like we have a contender for that spot, that appears on paper so far will be a winner.
I guess there is no harm in waiting it out and seeing what happens. Will cancel my ultimax order and see what happens with these subs. Who knows might be able to get a better quality sub when the specs on there other 2 subs come out.
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post #206 of 258 Old 05-03-2018, 05:29 PM
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Nah, the current restock date has been confirmed to me via email from them.
Confirmed
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post #207 of 258 Old 05-03-2018, 10:04 PM
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Some of you may already know about this company but I don't recall ever hearing of FU Audio before. I did just a quick search on the forum and didn't come across them either. They have an 18 incher that is priced about the same as the UM-18 as well: http://www.fuaudio.com/product-page/fu1250-18 It does have a higher Fs & Le than the UM but it also has higher power handling, BL and Xmax (at least according to their website). Could be another possible contender. These are also made in the USA like Fi Audio. That's a plus in my book.

More interesting though, is if you step down a series, then they happen to have another 18 incher that is currently listed for $200! Might this be a potential HT-18 replacement? It's obviously a sub designed for car stereo but maybe they also do custom orders. http://www.fuaudio.com/product-page/fu750v2-0-s-18
Looks promising. Maybe start another thread about FU?
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post #208 of 258 Old 05-03-2018, 10:22 PM
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circle jig

A few recent comments mentioned Jasper jigs. One other option is attached. It is a picture of my second homemade iteration. It goes to about 20" radius. FWIW. I actually googled and found a description or plans, I forget exactly which. So I cannot take credit. But this is the result.
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post #209 of 258 Old 05-04-2018, 06:56 AM
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I've requested and am awaiting FU Audio to post in this thread. He's been really easy to reach and talk to via Facebook Messenger, and I think he may mention that will be his best method of communication henceforth.

He did mention he can customize his builds, particularly one with a motor a bit smaller than the 1250, have a softer suspension, and 4-layer special voice coils. Still should have 1,000w power handling. I requested he provide estimated T/S parameters when available.

So let's await his response on here and go from there. I don't see a reason to start another thread just yet, but suffice it to say there are other vendors out there willing to help us out, and that is promising.
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post #210 of 258 Old 05-04-2018, 07:49 AM
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I've requested and am awaiting FU Audio to post in this thread. He's been really easy to reach and talk to via Facebook Messenger, and I think he may mention that will be his best method of communication henceforth.

He did mention he can customize his builds, particularly one with a motor a bit smaller than the 1250, have a softer suspension, and 4-layer special voice coils. Still should have 1,000w power handling. I requested he provide estimated T/S parameters when available.

So let's await his response on here and go from there. I don't see a reason to start another thread just yet, but suffice it to say there are other vendors out there willing to help us out, and that is promising.
I literally just sent them an email about their drivers before logging on and seeing this post. We were modeling the FU1250-18 yesterday and today to find something that may replace the UM.
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