Hello, I have a few DIY builds under my belt now but I’m still very much a beginner and still learning.
For my next project, I’m wanting to create a compact 2-way bass reflex loudspeaker utilizing a 6.5in -7in woofer and tweeter. The goal is create something petite in size yet huge in sound.
The enclosure will measure 12in (h) x 9in (w) x 12.5in (d)
Utilizing 3/4in thick wood.
This makes the enclosure roughly a half cubic ft.
For the woofer I’m planning on utilizing the
for the tweeter I’m wanting to use something compact that can be mounted very close to the woofer that also will work excellent with the chosen woofer.
I need help finding a worthy tweeter for this project and also opinions for the woofer I choose for this project, if it would be a good fit.
Thanks in advance,
Michael
For my next project, I’m wanting to create a compact 2-way bass reflex loudspeaker utilizing a 6.5in -7in woofer and tweeter. The goal is create something petite in size yet huge in sound.
The enclosure will measure 12in (h) x 9in (w) x 12.5in (d)
Utilizing 3/4in thick wood.
This makes the enclosure roughly a half cubic ft.
For the woofer I’m planning on utilizing the
PURIFI PTT6.5X04
as I’ve heard they work excellent in smaller enclosures and play very loud. Price isn’t a concern here.for the tweeter I’m wanting to use something compact that can be mounted very close to the woofer that also will work excellent with the chosen woofer.
I need help finding a worthy tweeter for this project and also opinions for the woofer I choose for this project, if it would be a good fit.
Thanks in advance,
Michael
i doubt if the purify can play loud. the sensitivity is spec'd at 88.7dB at 2.83V, but it's impedance is 4 ohms, so we´re cheating here. the 39mm small voice coil does limit the power. the spec says 80W program power, or 40W rms.
So what would you recommend? I’m not necessarily looking to set any records. Just a big sound that seems to defy their size.
big sound means lots of bass? I would then add a passive resonator in the back (no shelf placement hence). There are some nice passive resonators at SB acoustics, plus some nicely spec´d tweeters and woofers, but I have no recommendation based on own experience.
Build this design! Forget about the irrelevant details of designing a good enclosure, developing a ditto crossover or even the dilemmas of choosing drivers.
While I know of several designs with the 6,5” purifi’s, this one is well thought out and well documented. At this price level, I wouldn’t choose to be on my own (if I were a beginner).
While I know of several designs with the 6,5” purifi’s, this one is well thought out and well documented. At this price level, I wouldn’t choose to be on my own (if I were a beginner).
Last edited:
I can't believe anyone would ever build someone else's design. I'm even more amazed that someone recommends doing so. There are a few exceptions, but mostly that would only be my recommendation if the person was clueless, had no measuring equipment, and only planned to build one pair of speakers the rest of his life..
That’s the exact opposite of what I’m trying to achieve. I’m going for a compact enclosure, that enclosure is rather large to accommodate the WG. I would just build Paul Carmody Virage if I was looking for a proven design. I’m looking for help and assistance in achieving my vision, Not someone else’s.
Not necessarily, adequate bass for their size would be fine. I’m sure you e had the experience before where you’ve listened to a smaller bookshelf speaker and was surprised by the amount of sound coming from such a small speaker. I first had this experience when I listened to Boston Acoustics flagship bookshelf VR-M60 from the early 2000s. I was amazed at the amount of sound such small speakers were capable of producing. Massive sound stage, great imagining, clarity, and sheer output without sounding stressed.
This concept has stuck with me and inspired me to try and achieve such a speaker myself. I have a good understanding of the basics but I’m trying to further my understanding which is why I’m looking for suggestions and advice on her from people with more experience.
Yes, I’ve already built a few diy kits and I’m looking for to further my knowledge and progress with my own designs.
No personal experience, but reading online it seems your box is good for the paper version, but the port is problematic. The aluminum version is better suited, but the box would need to be 22 liters with a port. I've made a small 2-way that I was very happy with, but it used the long discontinued Dynaudio 17W17 mid-bass in a sealed cabinet (non-rectangular) with a Morel MDT-30 tweet. These days I'd probably go with an 8" driver because I don't consider longer excursion smaller drivers to be equivalent. It's hard to beat cone area. IMO, box programs are so good these days I'd spend a lot of time working out the box for a given driver and trying to decide if a sealed, ported or other arrangement is the best choice. That sounds like a very good driver but darn expensive for the pair.
Here's a small tweeter to consider. I have a pair, and I used them in a pair of speakers a while back. More recently, I've used it in a center channel speaker. I can't say it's the best option for you, but I do like it.
https://www.css-audio.com/online-st...e1se5cvUUg2SdHsPSDolgUUo2Rj6jtvQaAg5_EALw_wcB
That’s one of the tweeters I was actually looking at. Do you have the measurements for this tweeter?
I like the compact size and I should be able to find a woofer to pair with it for my goals. I’m thinking about this woofer in particular.
https://www.parts-express.com/HiVi-D6.8B-6-Poly-Bass-Midrange-Shielded-297-444
I would avoid that woofer due to rough response.
https://www.parts-express.com/pedocs/more-info/297-444-hi-vi-d68--40773.pdf
https://www.parts-express.com/pedocs/more-info/297-444-hi-vi-d68--40773.pdf
It's hard to get bass from a box that size. I use a sub. However, some of the Peerless HDS would be my choice when they become available. The f3 of most drivers in .5 cu-ft will be around the low fifties.
I don't at the moment. I might still have it. My center x-over measurements should be on my computer, if I saved them.
Last edited:
I can believe someone with basic experience would throw well over $1000 on drive units on his or her own design without having a clue about design parameters of even a relatively simple 2-way system. When someone comes over here to call for help on such an undertaking though, one good (if not best) advice is: go learn and measure, interpret, get your basics about sound reproduction right and learn on passive or active crossovers, building good enclosures, applying damping correctly and evaluating the results. Not some discussion on picking what drivers. That problem will solve itself as soon as you get the other stuff right.
But I chose the other good advice. Pick a proven design, build it and spend your money right and enjoy the music.
BlieSMa has excellent tweeters with small faceplates, by the way. But quite some here know you need a waveguide to match the Purifi (or most other 6,5” drivers).
Oops, now I did it too…
Last edited:
Why I have done it and saved myself quite a bit of money doing so. If it's a good design why not. At least you have a bench mark WRT frequency response and the impedance curve.
Rob 🙂