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Multi-Way Conventional loudspeakers with crossovers

DIY 2-way design for a bookshelf
DIY 2-way design for a bookshelf
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Old 19th January 2019, 12:54 AM   #1
zermak is offline zermak  Italy
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Default DIY 2-way design for a bookshelf

Hello everyone,
I am new around here but I wish you could help me choose the best design (meaning something already tested, basically I should "only" solder the crossover, make the enclosure and put all together) to realize for my needs.
I want to make a two way bookshelf to use as main speakers for a future 5.1 system but I am gonnna use them mainly for music: Italian (old?)pop music and some classic rock.
Sadly the space for the speakers is not a lot and that's why I am going for a bookshelf design. They will also be very close to the wall so I was thinking about a closed design or a front firing bass reflex design.
My budget is about 400 euros for a pair (considering speakers and crossover material).

I don't know if I can name some online stores here but I looked up to a German one, which offers many kits designed by professionals (featured in some paper magazines), and for example the "Mona 17" popped out.
I would like to know if someone has some experience with any of the designs from this magazines also.
I mean, is there something better sounding than the mentioned design for the same price (or into my budget)?
Last but not least, I will be driving them with some class D amplification (still choosing between ICE Power or UcD boards or maybe custom designs and going for PA amps) and in the mean time I'll burn them in with my TA Bantam Gold.


I hope you can give me some good advise or tips and thank you for your time.
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Old 19th January 2019, 03:11 AM   #2
eriksquires is offline eriksquires  United States
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So be careful in that a "bookshelf" speaker is often not tuned for a bookshelf.
This design is, but you may find it pricy based on the parts. A Speaker Maker's Journey: The LM-1 Bookshelf Version
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Old 19th January 2019, 06:33 AM   #3
kokoriantz is offline kokoriantz  Lebanon
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As you will have a high power amp and need small size enclosure, your choice is low efficiency speaker to have a good bass . I advise you a model posted wrongly on full rang forum that seams since over three years a celebrity on this website.
10F/8424 & RS225-8 FAST Ref Monitor
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Old 19th January 2019, 02:30 PM   #4
zermak is offline zermak  Italy
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Quote:
Originally Posted by eriksquires View Post
So be careful in that a "bookshelf" speaker is often not tuned for a bookshelf.
This design is, but you may find it pricy based on the parts.
A Speaker Maker's Journey: The LM-1 Bookshelf Version
I am not in a very bad situation and I can opt for nice volumes but I can't use floor-standing ones because the TV furniture takes almost all the wall's width and I don't want speaker standing in front of it so I'll put them on it next to the TV. Anyway thanks for the tip and effort to reply and if you have something else to show me please do.
Quote:
Originally Posted by kokoriantz View Post
As you will have a high power amp and need small size enclosure, your choice is low efficiency speaker to have a good bass . I advise you a model posted wrongly on full rang forum that seams since over three years a celebrity on this website.
10F/8424 & RS225-8 FAST Ref Monitor
Thank you for the link. That looks interesting and I am going to read it all in a bit. It doesn't look very good, aesthetically speaking, but I am sure a grill can solve the problem.
Do you know something about the materials cost and if there are proper schematics? Anyway I'll go check it out so maybe I'll find the answers myself.


Fell free to give me more alternatives to look at.
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Old 19th January 2019, 05:02 PM   #5
LineSource is offline LineSource  United States
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SB_Acoustics has excellent value drivers. Check you local dealers for pricing.

1st decision: smooth vs. higher-detail sound.

The poly plastic cone SB17MFC35-8 midbass has a smooth sound with very little cone breakup, and works well with modest cost crossovers and SB26STAC-C000-4 soft dome tweeter. parts = $150/speaker

For about $45/speaker more you can use the aluminum cone SB17NAC35-8 midbass and aluminum dome SB26ADC-4 tweeter which are reported to deliver greater details with steeper slope crossovers. parts = $195/speaker
==========
Cabinet size and bass extension. 2nd decision: 0.5cuft vs. 0.7cuft

A cabinet with a net internal volume ~ 0.7cuft will produce ~40Hz ported bass for enjoyable listening without a woofer. Port can be plugged for tight transient sealed bass in a 3-way design.

A cabinet with a net volume of 0.5 will have weaker 40-60Hz bass, common in 5.1 subwoofer designs.
Attached Images
File Type: jpg BookShelf.jpg (134.4 KB, 588 views)
File Type: jpg Beveled Cabinet.jpg (102.6 KB, 589 views)
File Type: jpg PolyCone .jpg (150.9 KB, 600 views)
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Old 19th January 2019, 07:31 PM   #6
zermak is offline zermak  Italy
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@LineSource
Thanks for the options provided.
I prefer a more natural (smooth?) sound but my dad, which will listen to them more often, is more on the bright side. I've had few bass reflex loudspeakers but I am willing to go for a closed box to enjoy a more, as you mentioned, tight transient.

The second design/baffle-cutouts looks like the one mentioned on my first post and some in the magazine I was talking about ("ScaMo" and similiars, maybe it's the same guy who developed it).

If I am going to choose the closed cabinet with the SB Acoustic speakers do you have any tips for the corssover? Or do I have to run a simulation and figure it out?

I've also seen the thread about the FAST ref monitor but I can't find any plans for the cabinet. I guess I'll look better into it to find something useful.

PS: Living in Italy I think I am going to buy the drives and the components on a German site which seems convenient and professional.
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Old 19th January 2019, 08:38 PM   #7
00940 is offline 00940  Belgium
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If you're in Italy, there's this Italian website too : Costruire Audio - Vendita online di altoparlanti, componenti cross over, attrezzature audio professionali, accessori per vinile, luci e palchi. I've ordered twice there and the experience has been pretty good. They carry SB acoustics drivers.
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Old 19th January 2019, 09:17 PM   #8
zermak is offline zermak  Italy
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@00940
Thank you for the tip and I knew about them, maybe I bought something from them in past; I'll keep them in mind for future purchases.

About the SB Acoustic build: is there any good plan with crossover design to write down a BOM to figure out what I am going to need and spend? I am intrested in the larger closed cabinet. The images above are alright for a start point but more detailed the better.
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Old 20th January 2019, 04:24 AM   #9
kokoriantz is offline kokoriantz  Lebanon
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zermak, I am in full solidarity with you to discard bass reflex or other electrically actuated resonators to add a home made extra boos . A closed enclosure with Qts of 0.5 is only the cleanest one , not the Butterworth. Qts 0.5 of second order is two first orders of identical frequency in series. As you will have a powerful amp , you can add on its input two resistors and a capacitor adjusted at the resonance of the speaker below which it over powers . By this the transfer function is reduced to first order in the filter's range.
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Old 20th January 2019, 02:30 PM   #10
zermak is offline zermak  Italy
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I don't mind the bass reflex, it's just that I am looking for something different now ahah


By the way I've seen some builds with the SB Acoustic drivers mentioned before in a bass reflex cabinet made by Troels Gravesen so I am wondering if the closed cabinet alternative is really a valid one.
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