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Multi-Way Conventional loudspeakers with crossovers

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Old 25th September 2018, 03:07 PM   #251
DonVK is offline DonVK  Canada
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I preferred the 2way BR with electrical XO. BTW thanks @drewmc for the improvement suggestions on the BP6 version.

Both designs work and are very listenable, and surprising for $30, but they both have their flaws and some explanation is required. In the 100Hz-500KHz range the TC6028 sounds better than one PC83 and in the >3Khz range the TD20F sounds better than the PC83. In the <80Hz range the TC6028 BP6 sounds better than the TC6028 BR.

I tried to use the pure acoustic roll offs that are inherent in both designs to reduce component costs. The BP6+Fullrange has 3 pure acoustic slopes, while the 2way has 1 pure acoustic slope + 2 electrical slopes. The pure acoustic slopes, like the sealed Fullrange LF rolloff at 180Hz, are due to decreased efficiency. The same power is going to the driver at LF and it still moves alot, generates decreasing output, can exceed Xmax and the SQ suffers. You would not notice that SQ issue from the swept sine FR test. It also occurs in the BP6 below its VLF rolloff (needs a HP to prevent low power Xmax) and above its LF rolloff (MF residue, needs a LP). Music with a high VLF content would unload the TC6028 (both BP6 and BR), xmax may be exceeded, and SQ would suffer across its entire range. I was not expecting the "in band" SQ to suffer as the drivers see their "out of band" frequencies, and I was incorrectly expecting just an acoustic efficiency drop.

The 2way electrical XO actually decreases the power to the drivers in the range where they misbehave (out of band). So less misbehaviour and the SQ is better. In my next project (modular 3way) I plan on making the electrical XO dominant to avoid using the pure acoustic slopes. So every driver will have a bandpass and will only be fully powered for its intended "in band" well behaved range.

Last edited by DonVK; 25th September 2018 at 03:08 PM. Reason: format
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Old 27th December 2018, 03:07 AM   #252
Jared is offline Jared
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So I built another $30 / pair set of speakers because for some reason that price point is play money, and any higher seems like a serious problem lol.
Dayton TCP115-8 small desktop speakers
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Old 27th December 2018, 03:09 AM   #253
Jared is offline Jared
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I also never posted a final picture of the other pair I made. My 5 yr old chose yellow and managed one coat of paint on his own!
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Old 27th December 2018, 08:36 PM   #254
DonVK is offline DonVK  Canada
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At $30, it truly is play money, and why not have some fun with it. I enjoy experimenting, learning something, then tearing it up and building again.
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Old 27th December 2018, 09:41 PM   #255
wintermute is offline wintermute  Australia
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silk purse from sows ear contest?
Both look great Jared!

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