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Would 1977 NOS Realistic 40-1286 Full Range Speakers work in .67 cabinets?

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mungodrums

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Would 1977 NOS Realistic 40-1286 Full Range Speakers work in .67 cabinets?
« on: 7 Mar 2021, 06:56 am »
Hello. I just came upon a pair of 1977 Realistic full range 8 inch speakers. I was wondering if these would work in a pair of Parts Express .67 cu mdf woofer flat pack cabinets? Hope so. What would they sound like? Ger.
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FullRangeMan

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Re: Would 1977 NOS Realistic 40-1286 Full Range Speakers work in .67 cabinets?
« Reply #1 on: 7 Mar 2021, 08:28 am »
Hi,
I will move this topic to the Single Driver Circle.

What was the original box litrage ?
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FullRangeMan

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Re: Would 1977 NOS Realistic 40-1286 Full Range Speakers work in .67 cabinets?
« Reply #2 on: 7 Mar 2021, 08:49 am »
Quote from: mungodrums on  7 Mar 2021, 06:56 am
Hello. I just came upon a pair of 1977 Realistic full range 8 inch speakers. I was wondering if these would work in a pair of Parts Express .67 cu mdf woofer flat pack cabinets? Hope so. What would they sound like? Ger.
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opnly bafld

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Re: Would 1977 NOS Realistic 40-1286 Full Range Speakers work in .67 cabinets?
« Reply #3 on: 7 Mar 2021, 01:20 pm »
fs (Hz) = 51.77
Qes = 1.669
Qms = 6.122
Qts = 1.305
Re (ohms) = 7.56
Vad (liters) = 48.57
BL (T-m) = 4.333
Sd (cm^2) = 214.0
SPL (dB/W/m) = 87.9

High Qts means very large sealed box, aperiodic loading for not quite so large, or open baffle.
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Jonathon Janusz

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Re: Would 1977 NOS Realistic 40-1286 Full Range Speakers work in .67 cabinets?
« Reply #4 on: 7 Mar 2021, 02:48 pm »
Did a quick search and this DIY Audio Projects forum thread seems to agree.  They calculated an optimum box about 2 cubic feet and suggested that would give a very full midrange sound.  That said, their prevalent suggestion was also to go open baffle:

http://diyaudioprojects.com/Forum/viewtopic.php?f=11&t=266

It reads like you found some fun drivers!
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Bemopti123

Re: Would 1977 NOS Realistic 40-1286 Full Range Speakers work in .67 cabinets?
« Reply #5 on: 7 Mar 2021, 03:35 pm »
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