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Multi-Way Conventional loudspeakers with crossovers

Fast, fun, Inexpensive OB project
Fast, fun, Inexpensive OB project
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Old 23rd October 2017, 11:13 AM   #1601
Pano is offline Pano  United States
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Fast, fun, Inexpensive OB project
2: The Peerless Vifa TC9 combo

The excellent Peerless SLS 830669 - 12" Woofer was retained as the heart of the Manzanita speaker. The Seas tweeter was replaced with the very good Vifa TC9FD18-08, 3.5" full range doing upper mid/tweeter duties. Many drivers were tried; the Vifa 3.5" is a winner for sound quality, cost and integration with the design.
On the same baffle we now have the Peerless 12 woofer and the Vifa/Peerless full-range. The TC9FD mates well with the 12 woofer and has all the midrange needed. The low pass portion of the crossover remains unchanged with a 20mH inductor as the only element. The high pass section is modified to suite the full range driver, with attenuation, high pass with a frequency shaping trap. The integration between drivers is now better than ever.

It is suggested to buy a small range of resistors to tune the tweeter attenuation and trap sections to your room.

Tweeter position should be mirrored left and right.
Attached Images
File Type: png new_crossover-revised.png (6.2 KB, 3168 views)
File Type: jpg manzie-15-front.jpg (23.2 KB, 2834 views)
File Type: jpg manzie-15-rear.jpg (31.2 KB, 2813 views)
File Type: png Manzanita-12.png (12.5 KB, 2627 views)
File Type: png Manzanita-15.png (13.4 KB, 2592 views)
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Old 23rd October 2017, 11:17 AM   #1602
Pano is offline Pano  United States
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3: The GFS 15 and the addition of the Ultra

The ever-rising cost of the Peerless 830669 woofer led to a search for an affordable woofer that worked well in the design and not hurt the wallet. The desire of many for a floor standing baffle also drove the choice of a new woofer. Enter the Parts Express GRS-15PF-8 15" woofer and a larger baffle. The GRS 15 is a suitable mate for the Manzanita project with its high Qts, low price and surprisingly good sound quality. Working with the TC9FD as a mid-tweeter, we are back to an excellent and affordable duo.

Baffle dimensions for the Manzanita utilizing the GRS woofer increased to 17” W x 29” H to accommodate the larger woofer frame. See baffle drawing and crossover in the post above.

The floor standing version of the Manzanita, dubbed “Ultra” uses a much larger baffle with the dimensions growing to 25.5” W x 48” H with full length 5.5” deep wings . The larger baffle increases the operating efficiency by around 3 db and extends usable bass response into the upper 20’s.
The low pass crossover remains the same, 20mH iron core inductor, the high pass retains the same number of parts while being adjusted slightly to suit the new woofer and baffle size. See the schematic. As always, we suggest buying a small range of resistors to fine tune the tweeter response to your room and your ears. 7, 8 and 9 ohms for the high pass pad, 10, 15, 20 and 25 ohm for the trap resistor. An optional trap can be added to the woofer, consisting of 15uF in parallel with 0.4 mH.

Going forward.
What’s in store for the next ten years? That’s hard to predict, but coming up soon there will be some baffle and side wing tweaks that will help extend the bottom end response a little, as well as improving overall efficiency. Stay tuned!
Attached Images
File Type: png Mazanita-Ultra.png (41.7 KB, 1201 views)
File Type: png Mazanita-Ultra-wing.png (12.1 KB, 972 views)
File Type: jpg Ultra-photo.jpg (29.8 KB, 993 views)
File Type: png ULTRA-crossoverV2.png (7.5 KB, 1266 views)
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Old 23rd October 2017, 04:25 PM   #1603
zimmer64 is offline zimmer64  Switzerland
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Fast, fun, Inexpensive OB project
Quote:
Originally Posted by Pano View Post
See the schematic. As always, we suggest buying a small range of resistors to fine tune the tweeter response to your room and your ears. 7, 8 and 9 ohms for the high pass pad, 12, 15, 20 and 25 ohm for the high pass trap resistor. An optional trap can be added to the woofer, consisting of 15uF in parallel with 0.4 mH.
Isn't there a typo re the resistors when compared to the schematic? Or is there a typo in the schematic?
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Old 23rd October 2017, 04:29 PM   #1604
Pano is offline Pano  United States
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Typo in the text, I think. Will double check.
EDIT: Schematic was wrong. Now fixed. Thanks for pointing it out!
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Old 23rd October 2017, 04:44 PM   #1605
rco3 is offline rco3  United States
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I see schematics for the Vifa/Peerless combo and the Manzanita Ultra with Vifa and GRS. The description suggests that the Vifa and GRS on standard baffle (not Ultra / floorstander ) do not use either of the two versions shown - there is a baffle drawing, but no schematic. Can you post that version as well?

Thanks

Rob
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Old 23rd October 2017, 05:31 PM   #1606
Pano is offline Pano  United States
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The crossover from the Vifa/Peerless will work with the Vifa/GRS. You'll want to tune the attenuation resistor, but you should do that to suit your room, anyway. John may have a target value to start you off.
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Old 23rd October 2017, 06:03 PM   #1607
rco3 is offline rco3  United States
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Thanks, Pano.
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Old 23rd October 2017, 10:06 PM   #1608
John Busch is offline John Busch  United States
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Default GRS - Vifa TC9FD crossover values

RCO3.... need to check my notes... know I have them... just need to locate them.

Sorry if it does not appear to be in previous threads.... for some reason I thought it was.. After 10 years there's been too many different projects to remember.

It may take me a couple of days. My memory tells me 8 ohm pad and 15 ohm on the high pass parallel trap. We shall verify. John
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Old 24th October 2017, 07:45 PM   #1609
B00B00 is offline B00B00  Canada
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Progress a little slower than intended... Funny how life gets in the way of life... Baffles built and on to final assembly. (Sorry for the distorted image, it's fine once clicked on. Not quite sure why that is the case) [IMG]
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Old 24th October 2017, 07:55 PM   #1610
Pano is offline Pano  United States
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Looks good! What is the wood?, the grain is pretty. End grain looks like pine, but the face is prettier than pine.
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