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Multi-Way Conventional loudspeakers with crossovers

Crazy crossover possible?
Crazy crossover possible?
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Old 13th February 2020, 10:07 PM   #11
Cal Weldon is offline Cal Weldon  Canada
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Crazy crossover possible?
Let's remember where we all started shall we? I had similar dreams as this and guess what? Some of them came true.

I think ntell would be best off if he got two 18 4Ω drivers and ran them in series. The inductors he will need are going to be big and expensive so definitely consider just two of them and keeping a single XO point. I think you also want to raise the XO to ensure you don't see smoke coming from the 8" Maybe 300 Hz and use both a cap and coil on the small driver to get a steeper slope.

In fact, you might want to consider going active. The Behringer 2-way is priced well and will give you a more secure control over things. But, you will need a second amplifier.

Even cheaper is to do a PLLXO. Passive line level crossover. Still need a second amp and you don't have a lot of control over things but it's a great way to save coin.

What is your goal here and what do you to put into it?
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Old 14th February 2020, 12:10 AM   #12
ntell411 is offline ntell411
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I will post my reply again as I don't know if it went through. Thanks very much for all the timely responses. My goal is to run 2 Goldwood 18 inch drivers (8 ohm, 94.3 db 2.83v/m) with 1 Fane 12 inch FULL RANGE driver (8 ohms, 100 db, 1w/m) crossing over at 300 hz using an inductor only. I really like the tone and clarity of the Goldwood woofers and Fane Full range and think that using 2 woofers will give me more dynamics and bass as they only have 2 mm displacement and I will use them in an OPEN BAFFLE arrangement. Ok, my audio piranha friends, please help me out!
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Old 14th February 2020, 12:31 AM   #13
Sonce is offline Sonce  Macedonia
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Fane full range will be way too loud for those low-cost two (parallel) 18" in a open baffle. Consider active bi-amplification: active (electronic) or passive (line-level) crossover and two power amplifiers (or one stereo amp) per speaker. One amp channel for the Fane, the second amp channel for the two 18-inchers. That is four amplifier channels in total, for a pair of open baffle speakers.
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Old 14th February 2020, 01:10 AM   #14
Galu is offline Galu  Scotland
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Quote:
Originally Posted by ntell411 View Post
1 Fane 12 inch FULL RANGE driver
Ah! You didn't mention the size of your full range driver in your original post and I somehow confused the 8 ohm with 8"!

Glad that's cleared up - please note that new information Cal.

Last edited by Galu; 14th February 2020 at 01:13 AM.
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Old 14th February 2020, 01:46 AM   #15
AllenB is offline AllenB  Australia
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Crazy crossover possible?
Quote:
Originally Posted by Cal Weldon View Post
and you don't have a lot of control over things
I beg to expand on this. I once built a PLLXO with a high, low, a step and a couple of notches in one stage. I used spice to design it.
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Old 14th February 2020, 02:21 AM   #16
PeteMcK is offline PeteMcK
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Q&D series xover? i.e. the two 18" in parallel, with a cap across them, all in series with the Fane...???
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Old 14th February 2020, 10:12 AM   #17
cm6 is offline cm6
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Also there might be an issue with a large value coil interacting with the back EMF from the 18" at 100Hz and below. Might want to consider a plate amp or two.
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Old 14th February 2020, 05:20 PM   #18
ntell411 is offline ntell411
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I have read all of the suggestions and not one of them gives me an answer as to why I cannot use 2 woofers and 1 fullrange driver (all 8 ohms) and treat this as a 3 way system where 1 woofer operates below 100hz (using an inductor only), the second operates below lets say 300 hz (using an inductor only) and the full range driver operates full range. I can use an L-pad to attenuate the full range driver to match the 2 woofers. Should this not work?
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Old 14th February 2020, 05:58 PM   #19
Galu is offline Galu  Scotland
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Quote:
Originally Posted by ntell411 View Post
I can use an L-pad to attenuate the full range driver to match the 2 woofers. Should this not work?
You would need L-pad resistors capable of dissipating large quantities of heat. Not recommended as L-pads are only suited to midrange and treble driver adjustment where the dissipated power is of a much smaller magnitude than in the bass.
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Old 14th February 2020, 06:05 PM   #20
system7 is offline system7  United Kingdom
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This is not an original thought from me, since I gleaned it from another thread!

But here's a project from Troels using an 18" woofer:

The-Loudspeaker

Just how it works, but wire two 18" in series and they come out same loudness.

So, yeah, maybe there's hope for this concept. 10" mid plus horn tweeter. Albeit Hypex amp on the basses for convenience. But a passive option too. Sadly Troels is being secretive about the exact filter values, cos he's gotta eat.
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