• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are daily reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Help? designing a DIY loudspeaker

Markie Warkie

Member
Joined
Oct 3, 2023
Messages
17
Likes
3
Location
Cyprus
"Warning ⚠ English is not my 1st Language AND I tend to be very OCD and verbose when writing.

Before I continue, after listening to a variety of speakers at my local audio shops, ranging from 1000 to 12000 euros, I have not yet found something that fully satisfies me. Out of all the speakers I heard, the Klipsch Forte 4s left an impression because I liked how 'fast' they sounded (transient response), they had a very interesting sound; however, they lacked bass (and had other weird characteristics). I could elaborate on this all day, but here's the TL;DR:

I want to design and build a 2 or 3-way speaker for both music and home theatre use (I know, pretty different applications). My room is 32m2 with a 3M tall ceiling (4.9m x 6.4m x 3m). I want to keep driver and crossover costs at a budget level, around 500~ euros per speaker, or around 1000 euros for a pair, not including cabinet costs.

After hours of obsessing and reading online, including a book I had at home about loudspeaker design, I came to a few design decisions:

1. MTM? (not 100% sure if needed in my case)
2. Closed OR passive radiator midsection
3. Passive radiator bass/sub 'tower'?
4. Analog Crossover (DSP is out of budget)
5. Good vertical and horizontal directivity
6. Fast transient response
7. Possibility for future Expansion (bass module?)

I chose the drivers below based on their characteristics, as well as simulations in Vituix Cad (although I'm not 100% sure about my accuracy), and insights from other people's posts and builds online, and in magazines like Klang+ton.

- Tweeter: SEAS Prestige 27TBCD/GB-DXT - H1499-06 (€99.95) x1
- Midrange/Woofer: SB Acoustics SB15NBAC30-8 (€79.95) x2
- Passive Radiator: SB Acoustics SB15SFCR-00 (€32.95) x2

The reasoning behind driver choice:

- I chose the DXT because I saw how well it performed in the R1 Directiva as well as DXT mon, DXT wave, and others, as well as tests by Heissmann Acoustics.
- The two SB15s have a nice flat response in a passive radiation enclosure that would make it easier to blend with the tweeter at a 2nd order crossover of 1.8KHz, as well as being a good budget driver.
- The two SB15FCRs should have enough surface area to dissipate the energy of the two 'mids,' as well as allow the group delay not to skyrocket.

Shortcomings/issues in my Thought:

- I'm trying to design a speaker and crossover without:
- Full FRD+ZMA files as well as directivity measurements.
- The actual response of the drivers with the baffle I designed and the box, so I know how to design the crossover.
- Am I expecting too much?
- No actual experience in the field of designing speakers aside from setting up and listening.
- Pretty low budget considering Directiva was 500 just for a woofer. :(
- Hyper obsessing on the project made me unsure about my decisions (ADHD + Autism is a pain).

Compromises willing to be made:

- Driver choices Mid/Woofer/PR
- Size, they could be big or small. WAF is not an issue.
- Low-end response, a 2-way with 2x5-inch can only do so much without extra reinforcement.

What are you asking from US? You might be asking:
- Help me with:
- Driver integration/Box
- Teach me new stuff because it's 100% inevitable that I'm gonna learn A LOT of new stuff from this post (thankfully)
- Crossover Design
- Baffle Size/Simulation
- Baffle Step
- Time Alignment T+M OR T+M+Future Basstower Or T+M+W

Inspirations for the project:

- DXT-Wave (Heissmann Acoustics)
- DXT-MON (Heissmann Acoustics)
- Directiva R1 (ASR + Rick Sykora)
- Nebular Monitor (Tony Gee humblehomemadehifi)
- NeXT-Monitor (Klang&ton)
- 8c (Dutch& Dutch)
- A700+A400 (Buchardt)

Thanks for taking the time to read my post. <3
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,134
Location
Northern Virginia, USA


Unless you really really really want to learn about speaker designing, I'd say just buy some. There's a lot of actual engineering.
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,134
Location
Northern Virginia, USA
And welcome to ASR!
 
OP
Markie Warkie

Markie Warkie

Member
Joined
Oct 3, 2023
Messages
17
Likes
3
Location
Cyprus
this all started from an idea of using the Hivi 3.1kit + a speaker stand with Dual opposing subs now it's just spiralled out of control tbh im lost in the sea of confusion and options
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,134
Location
Northern Virginia, USA
It's a great hobby. But you'll invest a lot of time coming up to speed, and make at least several speakers that aren't very good before you hit your stride. A lot of pros began that way, so it's not hopeless.
 
OP
Markie Warkie

Markie Warkie

Member
Joined
Oct 3, 2023
Messages
17
Likes
3
Location
Cyprus
my other reply is waiting for mod approval. so il just repost "Hey thanks for the reply I would like to learn tbh and I'm not really able to just buy due to the tight budget constraints closest thing i heard that i was happy were the rp8000MK2 and those are 2k over here (and even then were not 100% happy with em )"
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,134
Location
Northern Virginia, USA
Seldom is DIY economical in the long run. Take a look at that thread above, My experience with DIY.
 
OP
Markie Warkie

Markie Warkie

Member
Joined
Oct 3, 2023
Messages
17
Likes
3
Location
Cyprus
Hoping someone has a DIY kit close to what im looking at (i did find 1 that is close the Klang and ton one but the driver they said they used is not the same as the model listed)
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,134
Location
Northern Virginia, USA
Another dirty secret of DIY is that driver manufacturers don't care at all about discontinuing or modifying drivers, without the notification they would give to a major manufacturer.
 
OP
Markie Warkie

Markie Warkie

Member
Joined
Oct 3, 2023
Messages
17
Likes
3
Location
Cyprus
yikes so basically I'm fucked, I have a pair of old Pioneers that i gotta upgrade I cant enjoy music on them anymore
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,134
Location
Northern Virginia, USA
yikes so basically I'm fucked, I have a pair of old Pioneers that i gotta upgrade I cant enjoy music on them anymore
That is a good place to start. But you'll want a measurement setup if you want to design your own crossover.
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,134
Location
Northern Virginia, USA
And there will be math. You've been warned! :D
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,134
Location
Northern Virginia, USA

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,134
Location
Northern Virginia, USA
4. Analog Crossover (DSP is out of budget)
BTW...after about the tenth parts change, and you've got a substantial collection of coils and capacitors, that may not be so true anymore.
 
OP
Markie Warkie

Markie Warkie

Member
Joined
Oct 3, 2023
Messages
17
Likes
3
Location
Cyprus
yeah I can get Dayton from sound imports this is sorta discouraging but I'm gonna try and not to let it take the fun? ouyt of it
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,134
Location
Northern Virginia, USA
OP
Markie Warkie

Markie Warkie

Member
Joined
Oct 3, 2023
Messages
17
Likes
3
Location
Cyprus
Not quite sure what next Rn i was thinking of swapping drivers ? im really not sure how to continew
 
Top Bottom