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Welcome to DIY Sound Group
Details
Minimum order is TWO. This kit includes the flat pack cabinet but they are now being packaged and shipped differently. They are priced at cost ($45 each), so because of this they can't be shipped "for free". During check out the site will calculate shipping costs for just the flat packs, the other parts ship for free.
Please keep in mind that these kits take quite a bit of time to prepare. It would be good to allow 2 weeks for packaging and shipping but depending on how many orders have come in, it could take a little longer because I test and quality check all compression drivers per order and everything gets packaged individually. If you aren't comfortable waiting that long, please do not place an order right now.
From the Designer: The Celestion 12" woofer puts out a bit more bass but retains it's smooth frequency response and power handling. The new Celestion compression driver stays surprisingly smooth and detailed even at high output levels for a very well balanced sound. The large SEOS-15 waveguide has excellent directivity control for a very wide "sweet spot" so everyone hears the same thing without any significant changes in sound no matter where they sit in the room.
Product Notes:
With a depth of only 9.5" they will easily fit behind acoustically transparent screens if needed. Like the rest of the HT series, they are designed so they can be mounted normally or in a baffle wall. The HT-12's are capable of being used as matching Left/Center/Right speakers in very large rooms. They're also great in more moderately sized home theaters giving effortless reference level playback from AVR's with even modest power output.
Product Highlights:
- Very detailed sound with superb dynamics.
- Low distortion from the woofer and compression driver.
- Easy to power with a true 96db 2.83v/meter sensitivity.
- Quality name brand components.
- SEOS-15 waveguide gives you a larger 'sweet spot'.
- Will handle 325 watts and play over 120db.
- Designed for home theater and paired with a subwoofer system.
Cabinet Highlights:
- Made from all CARB 2 compliant material.
- 3/4" thick Ultralite MDF to keep weight low without loss of strength.
- 3/4" thick MDF front baffle.
- Cut with a CNC router for accuracy and easier assembly.
- Rabbet joints for braces, top/bottom, and side panels to increase joint holding power.
- Interlock bracing adds to panel stiffness and cuts down on cabinet vibrations.
Minimum order is 2 speakers: If you ordered one in the past and need one for a center, please contact me. Kits are sold as full kits, sorry no substitutions or subtractions. Don't forget binding posts, terminal cups, or speaker spikes if you need them because they can be shipped for free with any kit or flat pack purchase.
Shipping Note: We try to get your order packaged and shipped in 5-8 days depending on how many orders have come in. Please read the 'Frequently Asked Questions' section for more information.
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Review from a total noob review by Sterling on 11/9/2023I got these speakers several months ago, and due to living in an apartment with very little outdoor space to construct and paint, these took me much longer to get together than I wanted. I also jumped into this project with next to no woodworking, painting, or soldering experience, so getting my LCR together and looking passable was a huge learning opportunity for me, and I made every mistake you can expect! Once I got everything put together, however, I'm happy to report that my home theater sounds better than ever, and these amazing speakers are showing me what other components in my system need updating.
For other newcomers like myself, let me recommend a few things.
1. If you're looking for a nice, even paint coat, don't mess around with spray paint or rollers. I was flying through cans of spray paint when I tried that approach. Eventually, I ended up getting an inexpensive paint gun from Amazon, which made the whole experience so much faster and easier. Make sure you have plenty of drop cloths!
2. Count the number of clamps you think you need, and then double it. I got the cheap clamps from harbor freight, and they're just fine for this.
3. Get a router to make the edges nice and smooth, and go slow! I ended up marring some of the MDF and had to fill in marks with bondo and sand it down flat
4. Seal the edges of the MDF with wood glue. Get a cheap roller, thin the glue with water, and do a few coats over every exposed edge (excluding the edges for the waveguide, woofer, and ports. These will not be visible for the finished product.
5. Get some decent saw horses. I cheaped out on this, and one collapsed and dropped a cabinet on the concrete, ruining my day.
6. Recycled denim insulation is almost impossible to find these days, I used Rockwool and I'm very happy with the result.
Putting these together was definitely work, but if you're handy enough it won't cause any issues. Interestingly, painting them was by far the most time consuming step of the process. Gluing, routing, sanding, and soldering the components was a breeze in comparison. I'm pleased to report that the hard work was well worth it, and getting hammered with three of these whenever I watch movies now is an awesome experience. Next up are some decent subwoofers! -
Extremely happy! review by SRober on 10/24/2023
I purchased 3 HT-12s with the flat packs and circuit boards for my LCR in a 27’x17’x10’ dedicated theater room. These will eventually end up behind an AT screen, so the finish is just a rough matte black paint. That being said, they command a presence in the front of the room, and they sound absolutely incredible! I’m especially impressed by the level of detail from the compression driver, which has been amazing for movies with the family. Still can’t believe the quality of the front soundstage for the price paid. The value of these speakers is very hard to beat!
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Excellent directivity and dynamics from an easy to build, cost effective kit review by KevinC on 6/28/2022
Have a set of four used for surround duty, and they keep up with the QSC SC-2150 LCR and multiple full Marty 18" subwoofers at reference. Build is simple enough for a novice with a great community of people willing to support via various internet forums. Excellent directivity and dynamics, which are the name of the game for home theater, but these also excelled in some limited stereo music trials during post-build testing. These are an unbeatable value in my book.
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Great Speakers - Easy Build review by DanO on 12/30/2021
I use these for home theater as well as music and couldn't be happier. Paired with 18" subs, these sound great and plenty loud enough for my basement H.T. room. The build was easy as well taking me about 2 hours to have two assembled, including soldering the crossovers. Would definitely recommend.
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Excellent Speakers review by Howard on 9/11/2021
I built two of the HT-12’s a couple of weeks ago for my L/R in my home theater. I have nothing but good things to say about Erich, as well as the assembly and performance of these speakers. They went together phenomenally, and when completed, provide a sound that speakers MANY times more expensive would have trouble matching. They are on the warm side to my ears, coming from klipsch RP280-f’s, but you don’t lose that sparkle and clarity at all. There are no trade offs with this speaker if you have the subs to keep up. Also, don’t worry about powering them with 400 watts, they can handle that much power, but I have each on 80 watts RMS and love very loud volume levels, and these can provide crystal clear movies and music at uncomfortable levels for me, with no detectable distortion. You knocked these out of the park guys, thank you for providing an excellent product. And if you’re on the fence, please get these speakers. I promise you won’t regret it.
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Blown Away review by Jon on 3/13/2020
Purchased as the beginnings of a mixed use setup with a bias towards music. Started with mains to pair with two V.B.S.S. and it's been amazing thus far. The clarity is unlike anything I've heard before and the pairing sounds wonderful for music. With extreme toe-in there's a large sweet spot with the constant directivity. Like Matt has mentioned in some threads there is a slight bump in the mids that I enjoy.
Build with the flat pack was quick and easy. Highly recommended! -
Excellent speakers review by TimW on 10/30/2019
We built these to use as the main pair in a stereo music setup. Wow, great sound! The highs are sparkly without any kind of harshness, and while you do miss the subby lows, the low-mids are tight and clear. Paired with a sub these are killer!!!
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Audiophile Quality review by CG on 10/16/2019
WOW! I initially bought 4 of these to use as surrounds. But dang! They sounded so good, I hijacked 2 of them to use in my own room as my main stereo speakers now. I haven't enjoyed music like this for a long time now. They blew almost everything I have heard of before in terms of just pure sound quality. And on top of that, they'll fill your entire room with a wall of sound with just a pair. I also got a couple of Volt-8s to test out, and they also sounded really good. I am surprised how much volume those little fellas can put out. I am going to use them as my atmos speakers now.
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Amazing speaker review by BL on 8/23/2019
This speaker makes its presence known, both In stature and in sound. Same goes for this speaker as the 8’s I have reviewed, just many times louder. Just running it off of an AV receiver I can reach levels that physically hurt to stay in the room, with no distortion that I can hear I might add. If you have a large area that you watch tv or listen too music in and are thinking of getting a pair don’t wait, you won’t be disappointed. By far the best BANG for your buck.
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These are amazing review by Bryce on 6/10/2019
I just finished building these yesterday and did some listening and was amazed at the clarity and output of these. They are replacing PSA mt110s, which are very strong speakers, but I have to say these blew them away. I'll be testing these out with more movies and music soon, but I can already tell how great these are going to be.
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| Speaker Kit Information |
| Model: | The HT-12 |
| Designer: | Matt Grant |
| Frequency Response: | 65hz - 20khz (+/-3db) |
| Power Range: | 10 - 325 watts |
| Sensitivity: | 96db - 2.83v/1m |
| Impedance: | 8 Ohm |
| Tweeter: | Custom Diaphragm CDX1-1445 |
| Crossover Point: | 1450hz |
| Woofer: | Celestion 12" woofer |
| Enclosure Type: | Ported |
| Dimensions: | 18" W x 25" H x 9.5" D |
| Cabinet Material | MDF and ultralite MDF |
| Assembled weight: | About 40 pounds |
Price Break Down:
1 - Celestion 12" woofer: $1041 - CDX1-1445DA with custom HT diaphragm: $591 - Denovo SEOS-15 waveguide: $351 - Set of crossover parts: $32.772 - Ports: $6.601 - CNC cut front baffle: $181 - Set of screws and gaskets: $1.501- Speaker cabinet flat pack: $45Retail Parts Cost: $301.87
Packaging Material: $6.00
Paypal Fee: $9.70
Total Cost: $317.57
Discount Cost: $281.40
Kit Savings: $36.17
Please read the 'About Us' section for more information on pricing structure and quality parts used.
Specific HT-12 Assembly Notes:
A great HT Series assembly thread has been put together to help you build these popular designs. Click here for all the information and pictures.
Your enclosure should be built with 3/4" thick material and the included 3/4" thick baffle to the dimensions listed under the specifications tab. Please note that you do not need a double thick front baffle. You should have one horizontal "window pane" style brace between the waveguide and woofer along with one vertical brace dividing the cabinet in half. It is recommended that you line the inner panels with 1.5" thick acoustic style foam or you could line the inner panels with 2" - 3" denim insulation, but don't block the ports with it. Please be sure to read the general tips below before starting your build.
Recommended Tools and Supplies:
- Quality wood glue like TiteBond.
- At least 2 clamps 18" wide or bigger.
- Soldering Iron and solder unless there is an optional assembled crossover for your kit.
- Wire cutters
- Screwdriver
- Drill to predrill all screw holes.
- Sanding block or power sander.
- About 6' of speaker wire to connect your woofers and tweeter to the crossover board.
General Tips:
Crossover Assembly:
- VERY IMPORTANT - Inductors are the parts that look like small rolls of copper wire. Notice that the two ends of wire are silver and have been 'tinned' with solder. Those are the parts of the inductor that you should be soldering to, so don't cut it off to get to the copper colored portion. Inductors should not be installed directly next to each other on your board.
- None of the crossover parts have a positive or negative side so it doesn't matter which way they are facing when you assemble your crossover. 16-18 gauge wire is thick enough to use for your crossover or to go from your crossover board to the woofer or tweeter.
- Your crossover can be assembled on a thin piece of MDF or pegboard if the kit doesn't come with a circuit board.
- It doesn't matter where you put the crossover inside your speaker. You could mount it on the outside if you wanted to.
- Normally you wire red wires to positive and black wires to negative. If (and only if) your crossover schemtaic has a note saying 'Inverted Polarity', that means you need to connect the negative from the crossover to the positive on the tweeter and positive from the crossover to the negative on the tweeter. This is only done on some tweeters, not woofers.
- Click Here for a good assembly video by Matt Grant.
Screws and Gaskets:
- Predrill all screw holes with a bit that's slightly smaller than your screws to prevent the wood from splitting. Most screws are #8 panhead and you can use a 7/64" or 1/8" drill bit. Overnight Sensations use a #6 panhead so you can use a 3/32" bit.
- VERY IMPORTANT: Protect your woofer or tweeter when installing screws because you don't want the screwdriver to slip and puncture one of your components....that will ruin your day! Consider putting your free hand next to the screw to cover up the edge of the woofer or tweeter.
- If your kit comes with gasket tape, it should be applied to the back of the waveguide. Peel the paper off the back to expose the sticky side and slowly work it around the perimeter on the back side of the part. Some woofers will need gasket tape as well.
Stuffing or Lining the Speaker Cabinet:
- If your speaker or subwoofer is a sealed cabinet, most designers recommend that you lightly fill the inside with polyfill (pillow stuffing). If you don't have polyfill, then you can line the walls with 1" - 1.5" thick light weight open cell foam (like acoustic foam) or fiberglass insulation. You can also use 2-3" recyled denim insulation that can be bought at Home Depot.
- It's okay to cover up your crossover with the polyfill, insulation, or foam.
- If you're using a ported enclosure you should lightly fill the cabinet with polyfill and be sure not to block the ports. If you do not have polyfill then line the walls with 1" - 1.5" thick open cell foam (like acoustic foam), 2" - 3" of denim insulation, or 2" - 3" thick poly batting.
- Some of the speaker designers like to lines the walls of their ported enclosures with a 1" - 1.5" acoustic foam, and then lightly fill the remainder of the cabinet with polyfill. If this is a required method, it will be listed at the top of the page under 'Assembly Notes'.
Links to Build Threads for this Speaker:
Frequently Asked Questions:
* Do I need to use a subwoofer with these? Answer: Yes, these were designed to be used with a subwoofer.
* Where should I put the assembled crossover? Answer: The crossover can go anywhere inside the cabinet as long as you don't block the ports on the ported version.
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