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Multi-Way Conventional loudspeakers with crossovers

Small Speakers using Infinity CMMD Drivers
Small Speakers using Infinity CMMD Drivers
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Old 26th March 2020, 04:55 PM   #11
BradH is offline BradH
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Join Date: Jul 2019
I'll have to get one more driver for the center, or just TMW center identical to the rest, mounted upside down and angled toward listener.

What kind of measurements would I need to take in order to ask for help on a TMW crossover? Just a freq. sweep? Do multiple polars help?
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Old 26th March 2020, 11:52 PM   #12
BradH is offline BradH
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I have a lead on qty(8) 5-1/4" CMMD drivers from a different line for less than $200. Of course no measurements but should I go for it anyway? Then each speaker has one 4" mid and one 5-1/4" woofer to get down to the subs? Center can have one 4" and two 5-1/4". I know this is a bit of a janky build but we can have some fun with it no?
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Old 27th March 2020, 12:48 PM   #13
454Casull is offline 454Casull  Canada
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Quote:
Originally Posted by planet10 View Post
That works because you can get the W to M XO within that 1/4 wavelength metric.

dave
Its possible, but usually rather difficult. Typically youd end up with a sub-2 kHz crossover to a 3 mid and perhaps even need to use a small-format tweeter.
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Old 27th March 2020, 03:42 PM   #14
BradH is offline BradH
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Is freq response enough to see if two drivers match up? I'm thinking of buying these 5.25" drivers. They are from the second iteration of the Primus line, mine were from an earlier line, the Modulus and the Entra. I'd be looking to have the 5.25" do a narrow range from about 300 down to subs. Or should I just stick with two 4"? Worried about the midbass band being weak vs complexity of trying to integrate different drivers with unknown t/s.
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Old 27th March 2020, 11:28 PM   #15
BradH is offline BradH
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Picked up eight 5.25" drivers today for $150 CAD.

This is all the info I can really find on them until I take a look at the crossovers they came with.

Infinity 5.25"

Good news is that they are used in a center channel, the PC251 in sealed configuration. They claim to get down to 80hz in that small enclosure.
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File Type: jpg PRIMUS252-LF-2.jpg (101.3 KB, 16 views)

Last edited by BradH; 27th March 2020 at 11:37 PM.
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Old 27th March 2020, 11:45 PM   #16
BradH is offline BradH
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Question: In the case of these modulus speakers, the 3/4" tweeter crosses over to the 4" mid at 2500 hz, which is 5.24". Since the woofer is not beaming at this point why does the tweeter use a waveguide that is 2.5" at the mouth? 2.5" = 5400 hz.

Last edited by BradH; 27th March 2020 at 11:51 PM.
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