In article <tb41kp$ec8$1@gioia.aioe.org>,
Andrew <Andrew97d-junk@mybtinternet.com> wrote:
My little Amptastic Mini amp drives them just fine for TV
sound which is what they are for. Now I can hear bass that
the previous Philips computer speakers didn't reproduce.
Almost too much bass if anything, so I might try putting
some 'bungs' in the rear ports to see what effect that has.
I believe the Q accoustics speakers are rear-ported and
come with a pair of 'bungs' for those situations that need
them.
Too much bass generally means massive resonances somewhere?
Rear ported speakers are very sensitive to being placed in corners. Keep
them away and not too close to a wall. Are you sure what you are hearing is not in fact merely a more extended bass?
I know some resistive ports seem to be filled with what looks rather like a load of plastic drinking straws glued together.
Brian
It could be that I am hearing what I always should have heard because
the previous arrangement was my HD-FOXT2 STB feeding my Amptastic Mini
amp using phono connectors and a pair of re-purposed Phillips 320
computer speakers (circa 2006 but without the original 'brick'
PS/Amp). These were given a good review by various computer mags back
in 2006, which is why I bought them. The amp subsequently developed a
hum and the multiway 'din' connector that connected both speakers in
one plug suffered bent pins, so I binned it and rewired the speakers.
The Sony speakers are perched on top of my Wharfedale Linton 2's
(for now) and about a foot away from the rear wall.
Andrew
On Tue, 19 Jul 2022 12:53:42 +0100, "Dave Plowman (News)" <dave@davenoise.co.uk> wrote:
In article <tb41kp$ec8$1@gioia.aioe.org>,
Andrew <Andrew97d-junk@mybtinternet.com> wrote:
My little Amptastic Mini amp drives them just fine for TV
sound which is what they are for. Now I can hear bass that
the previous Philips computer speakers didn't reproduce.
Almost too much bass if anything, so I might try putting
some 'bungs' in the rear ports to see what effect that has.
I believe the Q accoustics speakers are rear-ported and
come with a pair of 'bungs' for those situations that need
them.
Too much bass generally means massive resonances somewhere?
And it won't actually be bass. Guaranteed it is over 100Hz.
On Wed 20/07/2022 12:16, Andrew wrote:
It could be that I am hearing what I always should have heard because
the previous arrangement was my HD-FOXT2 STB feeding my Amptastic Mini
amp using phono connectors and a pair of re-purposed Phillips 320
computer speakers (circa 2006 but without the original 'brick'
PS/Amp). These were given a good review by various computer mags back
in 2006, which is why I bought them. The amp subsequently developed a
hum and the multiway 'din' connector that connected both speakers in
one plug suffered bent pins, so I binned it and rewired the speakers.
The Sony speakers are perched on top of my Wharfedale Linton 2's
(for now) and about a foot away from the rear wall.
Andrew
Another silly question: why don't you use the Linton's? I have a 20Wpc
Class D amp (SMSL SA-36A Pro) driving a pair of Dentons as my computer speakers and they sound superb, especially on HD sound sources and recordings in flac or ogg format.
[John Collinson (who was the speaker designer of that time at Wharfedale then at Idle in Bradford and before that was Chief Engineer at Quad)
knew a thing or two about speakers. He left around 1973 and with another chap ex Wharfedale set up what was to become a well reputed speaker manufacturer - Castle Acoustics - in Skipton.]
On 20/07/2022 15:22, Woody wrote:
On Wed 20/07/2022 12:16, Andrew wrote:I tried them for a few minutes and the little amp got noticibly warm
It could be that I am hearing what I always should have heard because
the previous arrangement was my HD-FOXT2 STB feeding my Amptastic Mini
amp using phono connectors and a pair of re-purposed Phillips 320
computer speakers (circa 2006 but without the original 'brick'
PS/Amp). These were given a good review by various computer mags back
in 2006, which is why I bought them. The amp subsequently developed a
hum and the multiway 'din' connector that connected both speakers in
one plug suffered bent pins, so I binned it and rewired the speakers.
The Sony speakers are perched on top of my Wharfedale Linton 2's
(for now) and about a foot away from the rear wall.
Andrew
Another silly question: why don't you use the Linton's? I have a 20Wpc
Class D amp (SMSL SA-36A Pro) driving a pair of Dentons as my computer
speakers and they sound superb, especially on HD sound sources and
recordings in flac or ogg format.
whereas normally its case is cool to touch.
The Linton 2's are connected to my Denon DRA-455 receiver and while this
has an Audio input, connected to the Scart output of the HD-FOXT2, I
then have to turn up the volume to get the same output as it gives on FM 'tuner' which is a pain, so I keep the 2 systems separate.
The Linton 2's are quite big and I would prefer to replace them with something more modern and smaller. I have had them since 1978 when they
were 1 year old, and purchased from a neighbour.
The BHF ebay site has a pair of ProAcc Tablette ?10 speakers recently
and they went for about -u300. I had never heard of them but they
seem to be priced at well over -u1000 new, so someone got a bargain.
https://audiot.co.uk/p-24466-proac-tablette-10-speakers-proac-audio-t.aspx
https://www.youtube.com/watch?v=Vazjawwbzcg
[John Collinson (who was the speaker designer of that time at
Wharfedale then at Idle in Bradford and before that was Chief Engineer
at Quad) knew a thing or two about speakers. He left around 1973 and
with another chap ex Wharfedale set up what was to become a well
reputed speaker manufacturer - Castle Acoustics - in Skipton.]
Too much bass generally means massive resonances somewhere?
All ported speakers work the same way.
The driver has a resonance
dictated by its equivalent mass and the elasticity of its surround.
The port needs to have the same resonance frequency.
Speaker and port
are coupled well above criticality so the result is a pair of resonant peaks, one above Fr, and another below it.
Bought a pair of these in the Chichester British Heart Foundation shop
and to my untrained ear they are quite good.
Quite heavy, i.e. not the usual speakers sold with 'consumer'
mini-systems, and with 4mm binding posts that take banana plugs.
Rear-ported, and main drivers seem to made of some type of
woven fabric. Tweeters seem to work (I can hear them both)
and the rubber surrounds of the drive units are in perfect
condition.
Google doesn't find much data on them, so I assume they were
part of a Sony system of some sort.
My little Amptastic Mini amp drives them just fine for TV
sound which is what they are for. Now I can hear bass that
the previous Philips computer speakers didn't reproduce.
Almost too much bass if anything, so I might try putting
some 'bungs' in the rear ports to see what effect that has.
I believe the Q accoustics speakers are rear-ported and
come with a pair of 'bungs' for those situations that need
them.
What sort of material would be best ?
On 19/07/2022 2:27 am, Andrew wrote:
Bought a pair of these in the Chichester British Heart Foundation shop
and to my untrained ear they are quite good.
Quite heavy, i.e. not the usual speakers sold with 'consumer'
mini-systems, and with 4mm binding posts that take banana plugs.
Rear-ported, and main drivers seem to made of some type of
woven fabric. Tweeters seem to work (I can hear them both)
and the rubber surrounds of the drive units are in perfect
condition.
Google doesn't find much data on them, so I assume they were
part of a Sony system of some sort.
My little Amptastic Mini amp drives them just fine for TV
sound which is what they are for. Now I can hear bass that
the previous Philips computer speakers didn't reproduce.
Almost too much bass if anything, so I might try putting
some 'bungs' in the rear ports to see what effect that has.
I believe the Q accoustics speakers are rear-ported and
come with a pair of 'bungs' for those situations that need
them.
What sort of material would be best ?
**Put them on stands and move them away from corners and walls. You are likely getting too much 'room gain'.
Dope Pearce wrote:
================
Too much bass generally means massive resonances somewhere?
** Often a room effect and due to corner placement near the floor.
All ported speakers work the same way.
** News to Messrs Theile and Small.
The driver has a resonance
dictated by its equivalent mass and the elasticity of its surround.
The port needs to have the same resonance frequency.
** See above, there are many possible "alignments" not just the B4 one.
Speaker and port
are coupled well above criticality so the result is a pair of resonant
peaks, one above Fr, and another below it.
** There are two *impedance* peaks with a dip in the middle where the woofer cone excursion is a minimum and the port output at a maximum. Response rolls off at 24dB/oct below that frequency, if aligned correctly.
Plenty of software will predict the result for a given driver and box.
But room dimensions and construction has an over riding effect in all cases.
Too much bass generally means massive resonances somewhere?
** Often a room effect and due to corner placement near the floor.
All ported speakers work the same way.
** News to Messrs Theile and Small.
No it won't.
They both understood overcoupled resonance.
The driver has a resonance
dictated by its equivalent mass and the elasticity of its surround.
The port needs to have the same resonance frequency.
** See above, there are many possible "alignments" not just the B4 one.
Not relevant to what I am saying.
And you will find very few
commercial speakers that don't use this alignment.
** There are two *impedance* peaks with a dip in the middle where the woofer cone excursion is a minimum and the port output at a maximum. Response rolls off at 24dB/oct below that frequency, if aligned correctly.
Plenty of software will predict the result for a given driver and box.
And? We all know this.
But room dimensions and construction has an over riding effect in all cases.
We know that when it comes to woolly, boomy sounding speakers
Dope Pearce wrote:
================
No it won't.
Too much bass generally means massive resonances somewhere?
** Often a room effect and due to corner placement near the floor.
All ported speakers work the same way.
** News to Messrs Theile and Small.
** ROTFL !!
They both understood overcoupled resonance.
** Not what you fucking posted - dope.
The driver has a resonance
dictated by its equivalent mass and the elasticity of its surround.
The port needs to have the same resonance frequency.
** See above, there are many possible "alignments" not just the B4 one.
Not relevant to what I am saying.
** Yawnnnnnnnn - shame about what you posted then.
And you will find very few
commercial speakers that don't use this alignment.
** Bullshit. QB3 is far more common.
** There are two *impedance* peaks with a dip in the middle where the woofer cone excursion is a minimum and the port output at a maximum. Response rolls off at 24dB/oct below that frequency, if aligned correctly.
Plenty of software will predict the result for a given driver and box.
And? We all know this.
** Wot were your mysterious "peaks" then ???
But room dimensions and construction has an over riding effect in all cases.
We know that when it comes to woolly, boomy sounding speakers
** Begs the question.
Can the casual listener tell if it's the room or speaker that is actually "boomy."
Or just Dope Peace who is balmy .......
..... Phil
On Wed 20/07/2022 12:16, Andrew wrote:
It could be that I am hearing what I always should have heard because
the previous arrangement was my HD-FOXT2 STB feeding my Amptastic Mini
amp using phono connectors and a pair of re-purposed Phillips 320
computer speakers (circa 2006 but without the original 'brick'
PS/Amp). These were given a good review by various computer mags back
in 2006, which is why I bought them. The amp subsequently developed a
hum and the multiway 'din' connector that connected both speakers in
one plug suffered bent pins, so I binned it and rewired the speakers.
The Sony speakers are perched on top of my Wharfedale Linton 2's
(for now) and about a foot away from the rear wall.
Andrew
Another silly question: why don't you use the Linton's? I have a 20Wpc
Class D amp (SMSL SA-36A Pro) driving a pair of Dentons as my computer speakers and they sound superb, especially on HD sound sources and recordings in flac or ogg format.
[John Collinson (who was the speaker designer of that time at Wharfedale then at Idle in Bradford and before that was Chief Engineer at Quad) knew
a thing or two about speakers. He left around 1973 and with another chap
ex Wharfedale set up what was to become a well reputed speaker
manufacturer - Castle Acoustics - in Skipton.]
Yes Dentons were way ahead of their times for 2 unit infinite baffle
speakers and not prone to the polystyrene decay of some of the more up
market speakers. I have some in the front sitting room, even an old fidelity amp sounds good on those.
Brian
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