Author Topic: Hivi 3Way Build  (Read 955 times)

Offline Timber_MG

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Re: Hivi 3Way Build
« Reply #15 on: June 14, 2018, 01:21:03 AM »
yes the best would be 8" in its own calculated enclosure and 5" in a small enclosure to seal it from the bass driver. but most importantly is to calculate the enclosures properly and the ports required. the drivers do have some nasty breakup and will require 2nd order crossovers.

2nd order targets may require 3rd order filters. Not sufficiently dealing with the breakup makes for fatiguing listening.

Offline GECO

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Re: Hivi 3Way Build
« Reply #16 on: June 14, 2018, 08:25:26 AM »
2nd order works fine on these speakers

Offline Shonver

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Re: Hivi 3Way Build
« Reply #17 on: June 14, 2018, 09:23:07 AM »
Rudi, are you talking acoustic or electrical slopes?
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Offline GECO

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Re: Hivi 3Way Build
« Reply #18 on: June 14, 2018, 09:32:40 AM »
electrical. but more remember this is a amateur build and not to be complicated

Offline GECO

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Re: Hivi 3Way Build
« Reply #19 on: June 14, 2018, 10:02:02 AM »
But i see what you getting at.


Offline Timber_MG

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Re: Hivi 3Way Build
« Reply #20 on: June 14, 2018, 10:31:25 AM »
Those HiVi tweeters don't do that well at 2nd order electrical ime though perhaps you're intending a high cross (I didn't check up transfer function for detail). The issue with breakup is often that the acoustical slope is influenced by other factors and one uses one leg of the filter for filter contour elsewhere usually with a 3-way like this.

Offline Shonver

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Re: Hivi 3Way Build
« Reply #21 on: June 14, 2018, 10:37:20 AM »
The old-school way to crossover rolling is to look at textbook filters; here one describes the crossover in terms of its electrical order. Nowadays, we have free access to measurement and design tools, which enables one to consider the specifics of the design. We get a more intimate look into the driverís characteristics and can tune accordingly. Sometimes a 4th order acoustic slope can be achieved with only 2 components, sometimes it requires up to 6.
Herewith a glimpse into the process: https://youtu.be/h5g80pX4HkM

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Offline GECO

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Offline Shonver

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Re: Hivi 3Way Build
« Reply #23 on: June 14, 2018, 11:05:23 AM »
Would you agree that the sensitivity of that 8-inch looks a bit optimistic? If not, that 5 mid might be a tad insensitive. The problem is that the "mid" might actually be a woofer. It's not an insurmountable problem, but just makes things a bit difficult.
« Last Edit: June 14, 2018, 11:08:02 AM by Shonver »
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Offline GECO

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Re: Hivi 3Way Build
« Reply #24 on: June 14, 2018, 11:18:06 AM »
yes you right. that 5" at 86 is not ideal. the 8" might be close to 88 db

Offline bbe22

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Re: Hivi 3Way Build
« Reply #25 on: June 14, 2018, 11:20:16 AM »
? 300 and 3K Hz  looks doable if the 5 inch  sort of  behaves in box and the breakup is taken care of but if this was my build   i'd  ( like in box measurements and)  probably aim at  4th LR to start .....

Offline GECO

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Re: Hivi 3Way Build
« Reply #26 on: June 14, 2018, 12:03:21 PM »
i would aim at simplicity as it is supposed to be fun project and a learning curve. if it sounds good to you then it is good enough irrespective of accademic data

Offline bbe22

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Re: Hivi 3Way Build
« Reply #27 on: June 14, 2018, 12:18:25 PM »
if it sounds good to you         wise words     esp in our hobby     

Offline Shonver

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Re: Hivi 3Way Build
« Reply #28 on: June 14, 2018, 12:18:39 PM »
? 300 and 3K Hz  looks doable if the 5 inch  sort of  behaves in box and the breakup is taken care of but if this was my build   i'd  ( like in box measurements and)  probably aim at  4th LR to start .....
I would agree. The one thing those graphs gives us is an initial indication of possible crossover points. They don't tell the whole picture, though, because if only shows 30 deg and we don't yet know distortion profiles (particularly for the tweeter), though there may be some to be found online.

Rudi, point taken about simplicity. I'm sure the OP won't mind some further aspects being discussed, though.

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Offline GECO

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Re: Hivi 3Way Build
« Reply #29 on: June 14, 2018, 12:36:24 PM »
i would suggest the purchase of a mic like minidsp unik as a starting point then you can see what you doing and inly then the academics comes into play. to many times noobs have been scared out of projects due to information overload