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Multi-Way Conventional loudspeakers with crossovers

Nearfield Monitors with 5 or 6.5" woofer
Nearfield Monitors with 5 or 6.5" woofer
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Old 7th September 2018, 09:25 PM   #1
gug42 is offline gug42
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Default Nearfield Monitors with 5" woofer

Hello guys,


I would like to work on a small Nearfield monitors. Any help would be really appreciate. For first run and test I will use active crossover.

I would like a pair of nearfield with :
- 90 or 91 db / W / m
- woofer with a really big motor
- woofer with Fs around 50 Hz
- woofer with a Xmax around 5mm
- lowe distorsion
- low budget, round 200
- smalles size possible

Well a sort of jack all trade !

Thank you in advance !

Last edited by gug42; 8th September 2018 at 09:48 AM.
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Old 7th September 2018, 10:59 PM   #2
LineSource is offline LineSource  United States
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For a Nearfield monitor sonic accuracy should be more important than high efficiency.
Consider this SB_Acoustics ported example.

=============The Devil is in the Details.
I would like to work on a small Nearfield monitors. For first run and test I will use active crossover.
??? Will you ALWAYS use DSP crossover -OR- must the design also work well with a passive crossover
??? Does your DSP include time delays to compensate for driver physical offset
??? A passive design will require a larger ported cabinet for bass goals than active with DSP bass boost

I would like a pair of nearfield with : - 90 or 91 db / W / m
??? 4-ohm or 8-ohm

- woofer with a really big motor
- woofer with Fs around 50 Hz
- woofer with a Xmax around 5mm
- low distorsion

- low budget, round 200
??? For each speaker
??? Drivers only
??? Drivers + passive crossover
??? Drivers + passive crossover + cabinet

- smallest size possible
??? With DSP + bass boost
??? With passive crossover in ported cabinet
Attached Images
File Type: jpg SB Acoustics monitor.jpg (143.9 KB, 493 views)
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Old 7th September 2018, 11:10 PM   #3
gug42 is offline gug42
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Hello,

You are right. Thank you. I'm not clear at all !
- DSP include time delay and phase compensation.
- I prefer speakers who can work with passive crossover. For the first round i will use active crossover.
- I want to be able to migrate from an active crossover to a passive crossver without changing the speakers.
- I prefer to have a little large boxes and have some bass. The cabinet, with MDF, is not the costly part ....
- around 200€ drivers only, for the 4 drivers. Of course, if there is a sonic gape, for some bucks,
- Preference for 8 Ohms speakers

Thank you for this exemple. Can I presume the bass reflex ports is visible at 40Hz ?

Last edited by gug42; 7th September 2018 at 11:19 PM.
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Old 8th September 2018, 03:20 AM   #4
eriksquires is offline eriksquires  United States
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FaitalPRO has some excellent mid-woofers in the range, with particularly good HF extension. A real bargain.

On the upper end of course are the Satori and ScanSpeak Revelator/Illuminator line.
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Old 8th September 2018, 05:02 AM   #5
LineSource is offline LineSource  United States
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Quote:
Originally Posted by gug42 View Post
I prefer to have a little large boxes and have some bass. The cabinet, with MDF, is not the costly part .... Can I presume the bass reflex ports is visible at 40Hz ?
The port is normally put on the rear panel behind the tweeter, or on the bottom of the front panel. Troels Gravansen monitor cabinet is one example.

Example: Volume vs F3 for SB17NRXC35-8
0.6ft^3 = F3 =48Hz
0.7ft^3 = F3 =45Hz
0.8ft^3 = F3 =42Hz
1.0ft^3 = F3 =38Hz
Attached Images
File Type: jpg F3 x volume.jpg (85.9 KB, 454 views)
File Type: jpg Troels Gravansen Drawing.jpg (67.3 KB, 444 views)
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Old 8th September 2018, 07:48 AM   #6
rabbitz is offline rabbitz  Australia
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The tweeter in the pic in post #2 is SB26STAC-C000-4. The crossover is my design which has been posted here previously but I have no idea about the enclosure as I do not know where it came from or whether it uses that crossover.

I would not use it nearfield as I think it could go too low but could be modded (size and tuning) as well as if it was sealed instead of vented it should be OK for around 65Hz. The woofer could be changed to SB15MFC30-8 with minor crossover changes to give a smaller design.

For nearfield work I usually go for an F3 between 50-60Hz and all the ones I use range between 60-75Hz. For nearfield I use drivers 5" or smaller.

One of the speakers I use for nearfield is Jeff Bagby's Soprano but may be a bit small for what you are after.
Various loudspeaker design suggestions
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Old 8th September 2018, 09:47 AM   #7
gug42 is offline gug42
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Hello,


Thank you for your help !
@LineSource : thank you to have help me to clarify my needs ! Indeed it's the most important thing in a projet. Schematics are great and clear.
@Rabbitz : I will look after that.

Indeed after some reflexion :
- For near field and a small sized box, I would prefer a 5" wooffer. The 4" is interesting too, but a little more limited thant a 5".
- If I need bookshelf, or good surround, I will go with a 6,5"
- F3 around 55Hz seems good to me. I would prefer a speaker close to 90 dB/W/m. Of course I prefer to drop one dB and get a "better" result.


Thank you.
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Old 8th September 2018, 11:16 AM   #8
peterbrorsson is offline peterbrorsson  Sweden
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Hi,
You haven't specified where you're located but here are some European alternatives...


Little Yellow Cab – Die Referenz Kompaktbox mit 8″ TT – Donhighend Audio

Cinetor & Cinetor HWG – Heissmann Acoustics
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Old 8th September 2018, 03:22 PM   #9
Charles Darwin is offline Charles Darwin  United Kingdom
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I am a great fan of the FaitalPro 5FE120 but it 'only' goes down to 63Hz.

Since you mentioned a price of below €200 I assume you are in Europe.
This is where things get weird because prices vary quite dramatically!

In the UK it costs about 21 or €23.50 from Blue Aran or Lean Business and about the same in France from toutlehautparleur.com.
However the prices I found in Germany range from €37 to €45.
In other words the same or more than what this Italian-made driver costs in the US!
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Old 8th September 2018, 04:51 PM   #10
gug42 is offline gug42
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Hello,


I'm in Europe/France.
Thank you I will look to them ! I found zaphadio website with lot's of tests.


Regards
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