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Troubles finding PR
Troubles finding PR
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Old 26th December 2018, 06:25 PM   #11
kcducttaper is offline kcducttaper  United States
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Yep. I added 30g in my 175pr sim and I added some weight to the ND 5.25's, but I don't remember how much.

Cool. Thanks!

In my sim, they peaked excursion at ~42Hz or so, which is the tuning frequency I had set.
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Old 26th December 2018, 10:10 PM   #12
wolf_teeth is offline wolf_teeth  United States
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It may be such a thing that the 175 and ND versions are not as durable or up to the task as far as suspensions go.

Are you modeling for maximum power input? That could also be the issue. I tend to model for output level required, not thermal power rating. For subs, you'd like to be able to hit 105dB, but not all can do that. I tend to model at 100dB/1m as a worse-case scenario for pretty much all woofer modeling. 95dB is at a point that in larger rooms issues could become a concern the further you are from the speaker. 100dB will be almost 4x the power input over the 95dB level, so it's a good measure.

Later,
Wolf
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Old 27th December 2018, 02:01 PM   #13
kcducttaper is offline kcducttaper  United States
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Perhaps. I did actually measure the travel of the ND and, to my surprise, it was the full amount specified. I know the W5 is a beasty of a little 5.25", but it's starting to get a little silly. I may just order 4x of the 175's just for giggles and see if that works any better.

Currently, I model using the rms rating, so that would be 40w for the W5. I don't really expect 100+ dB out of these things, but I do want the PR's to be able to handle as much as the driver can dish out.
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Old 28th December 2018, 04:52 AM   #14
wolf_teeth is offline wolf_teeth  United States
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Remember that doubling the PRs means also doubling the mass added to all 4 vs. 2 units to get the same tuning. The DS175 are likely not able to have more than 200g added and have the suspension keep its composuree. IIRC, the 215 was limited to 250g.

Later,
Wolf
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Old 28th December 2018, 01:46 PM   #15
kcducttaper is offline kcducttaper  United States
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Ohhh....maybe that's where I went wrong. Off the top of my head, I don't think that logic is in WinISD, so I probably just added the 'correct' weight for a single PR on both PR's. Good catch!
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Old 13th February 2019, 03:44 AM   #16
3rutu5 is offline 3rutu5  Australia
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glad i read this post, i was going to mount a PR on the bottom to hide it like they do most small subs. But understand if pointing up or down the weight will always be active and not work at all.

Wolf, if i understand correctly if you are doing the exercise and size a singular, you would halve the weight if using dual PR's? These things have confused me as some don't supply a XMax so working out the VD is quite difficult
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Old 15th February 2019, 06:46 PM   #17
wolf_teeth is offline wolf_teeth  United States
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Nope. Just like when you have to double the length of ports going to 2 from 1, you have to double the mass for both PRs as compared to a single; ie- 4x mass total vs single PR.

Wolf
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