Author Topic: Couple of Questions  (Read 939 times)

Offline steve

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Couple of Questions
« on: March 14, 2018, 06:21:37 PM »
Got a couple of questions for all, and question 2 especially for those with subs.

1) How many would, or do, remove their speaker grills so the mids/tweeter drivers show?

2) What do you think of a crossover frequency in the vicinity of 160hz, give or take? Any problems with adding a sub at that frequency?

Cheers and Thanks.

steve
Steve Sammet (retired, but manufacturing "V" ics again)

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Offline rollo

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Re: Couple of Questions
« Reply #1 on: March 15, 2018, 10:56:13 AM »
  Yes and no some like the grill in place others excel without. Depends on design.
  No if one has a bass driver capable of that frequency.


charles




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Offline doug s.

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Re: Couple of Questions
« Reply #2 on: March 27, 2018, 10:10:35 PM »
steve,

well, some of my speakers don't have grilles, so there's no choice there.   :D  one pair of speakers i have - meret re's - have some built-in tapered felt in the grilles that are designed to fit around the drivers, so i always have used the grilles w/those speakers.

re: subs, if you have subs that really put out significant output to below 20hz, they might not want to be playing as high as 160hz, but it is possible; it depends on the model.  the highest i've ever run my vmps largers was 125hz, where they actually sounded cleaner and tighter between 50-125hz than some swans monitors i was using, that had a low end bump built in, i guess to make them sound more full-range than they really were.  (not unusual in many smaller speakers, actually).  besides the low end bump, the swans were actually really nice, and they sounded great crossed w/the subs at 125hz.  the swans now are happily being run in a relative's house, full-range, with a digital amp-based fm/cd receiver that's actually a bit lean sounding, so it's a nice match for them.

another thing about a 160hz crossover point, (or any crossover point, imo, but especially one that high), is that you really want to be running stereo subs.  and i'd think 24db/octave min x-over slope would also be wise.

doug s.

Offline Nick B

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Re: Couple of Questions
« Reply #3 on: March 28, 2018, 08:45:53 AM »
Got a couple of questions for all, and question 2 especially for those with subs.

1) How many would, or do, remove their speaker grills so the mids/tweeter drivers show?

2) What do you think of a crossover frequency in the vicinity of 160hz, give or take? Any problems with adding a sub at that frequency?

Cheers and Thanks.

steve

I used to keep speaker grills on all the time for aesthetic reasons, but did get out of the habit a few years ago when I upgraded all my wires and got a new dac. That improved the resolution quite a bit. With my soon to be here  LS 50s, they donít have a cover and look great as is.
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Offline richidoo

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Re: Couple of Questions
« Reply #4 on: March 28, 2018, 12:10:26 PM »
The height of the sub driver and midbass drivers affects the choice crossover freq. The floorbounce cancellation has to be considered.

Usually if you place the sub low and the midbass high enough then you can get away with higher xo freq and still avoid making a bass suckout from bounce cancellation.

A speaker like my Legacy Focus have 4 LF drivers at heights from 14" up to 52" all crossing over at 120Hz. So all those floor reflections flatten each other to make a full bass response. In the previous version they added a 12" helper driver just to fill in the floorbounce.  If you put the bass driver on the floor and the mid near earheight (35") then you can have crossover at 250Hz and no floor bounce cancellation.  But that's pretty high xo, few consumer sub drivers can play that high - too much inductance. As the xo freq goes up the distance between the drivers must get shorter to avoid lobing cancellation.

Another factor to consider is the performance of the bass driver itself. Most inexpensive HT subwoofers drivers don't have the performance to reach above 80Hz. So either build your own from quality parts, or make sure the sub you buy can play as high as you want. Remember the crossover band continues way above the crossover point, so for 4th order LP filter the sub should play with low distortion up to double the crossover freq.

Offline steve

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Re: Couple of Questions
« Reply #5 on: April 02, 2018, 01:11:31 PM »
Quote
Another factor to consider is the performance of the bass driver itself. Most inexpensive HT subwoofers drivers don't have the performance to reach above 80Hz.

I thought inexpensive subwoofers might be a major concern. Here are two photos of my little project in curved cabinets. With the xover and little zobel, excellent sound.

« Last Edit: April 02, 2018, 01:14:20 PM by steve »
Steve Sammet (retired, but manufacturing "V" ics again)

SAS Audio Labs Test Phono Stage
SAS Audio 11A Reference Preamplifier
SAS Audio 25 W Triode Reference Amplifier
Test Spkrs
"V" ICs
10 parallel 18 ga. speaker wires