Crossfire BMF1700D Spezifikationen PDF herunterladen (Seite 6)

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SINGLE INPUTS

STRAPPING TWO AMPLIFIERS TOGETHER

Getting a clear signal from the head unit to the ampliﬁer is very important. To achieve this, the proper signal cables (RCA style)

must be used. Estimate the length of the cables necessary. Take note that signal cable manufacturers will probably not have the

exact length necessary for your vehicle. If you are between sizes, purchase the slightly longer cable. You can always hide the

extra wire.

Be aware of the differences in cable. Better RCA’s usually have multiple layers of shielding and/or twisted pair wiring for better

noise rejection. Ask your local dealer for his recommendation.

LINE LEVEL INPUTS

Car environments are notorious for poorly insulated wires. This means that hiss, engine noise, and electrical noise can easily be

picked up through RCA cables if ran incorrectly. To avoid inducing noise into the system, run the RCA’s away from large wire

looms and electric fans if possible. Always make sure to position your signal cables away from the power wire, preferably on the

opposite side of the vehicle or at least 18” apart. When routing the power wire, use caution around sharp corners or body parts

that may easily cut through the cables.

When connecting the signal cables, check the balance to the source unit and the ampliﬁer. The cables should be marked: red is

right and black or white is usually left. Once you have connected the signal cables to the head unit, slide the unit back into the

dash. Make sure the unit is in securely.

HIGH LEVEL INPUTS

Please use a high quality line level convertor to convert the high level outputs from your headunit to low level signals

LEVEL CONTROL

Next to the preamp inputs on the side panel of the ampliﬁer is the level control, commonly referred to as the gain. The gain allows

you to match the output level of your source unit or signal processor to the input level of the ampliﬁer. Matching the input can be

accomplished in three simple steps:

1. Turn gain (level) control to minimum.

2. Turn on the source unit and adjust to 2/3 of max volume while playing music.

3. Adjust the gain control until desired, maximum volume is achieved without audible distortion.

Remember that the gain control is not a volume knob. Ignoring the three steps above may leave you

with damaged speakers and possibly damaged ampliﬁer(s).

Master: this setting will maintain the same phase as the signal applied to it.

1. Use this setting if the ampliﬁer is not bridged with another ampliﬁer.

2. When strapping the ampliﬁers, use this setting only on the ampliﬁer that is connected to the head unit.

Slave:

this setting limits the controls of the secondary ampliﬁer in a strapped pair.

1. Use this setting only on the second ampliﬁer in a strapped pair. All crossover, subsonic and level controls of this ampliﬁer will

be bypassed. The ampliﬁer set on Master will then control all the preamp functions for both ampliﬁers.

SUBSONIC FILTER

The subsonic ﬁlter is used to reduce the amount of low frequency harmonics and/or subsonic noise picked up in audio systems.

Both of these can be damaging to subwoofers and possibly the ampliﬁer(s). As well, harmonics and subsonic noise can cause

the ampliﬁer(s) to pull excess power from your electrical system.

This ﬁlter is switchable, ON/OFF on BMF250M, and BMF500M. All Class D series ampliﬁers, the subsonic ﬁlter is on at all times

and is variable from 15Hz to 40Hz. So what frequency should you set the subsonic ﬁlter at? For most applications it is desirable

to leave this between 15Hz and 30Hz. If you are using a ported enclosure designed for SPL, yet you are using the system on a

daily basis, a higher ﬁlter frequency may be desired. This will allow the enclosure to be tuned higher and reduce the chance of the

woofer to become non-linear and destroy itself.

“Strapping” Two ampliﬁers together

Strapping two like ampliﬁers together is fairly easy. Study the following instructions as well as the diagrams below to assure proper

connections. If you experience any difﬁculties, please contact Crossﬁre’s Technical Assistance at tech@crossﬁrecaraudio.com

STRAPPING CIRCUIT (Invert output)

The internal strapping module can only be used when a pair of either BMF1000D or BMF1700D are used. Strapping allows for

the two ampliﬁers to be run in series and achieve double the output into one load. However, this does change the minimum im

pedance stability to 2 ohms. Strapping the ampliﬁers should only be done if the proper impedance cannot be achieved with the

ampliﬁers separated.

It is very important to set the Master/Slave control on the ampliﬁer whether you are strapping or not. If the settings are in the

wrong position, the ampliﬁer(s) may not work. There are two settings for this control: Master and Slave. Use the following to de

termine what position to set your ampliﬁer(s) in. For further reference, please review the drawings following.

BRIDGE SETTINGS AND WIRING

It is very important that

a negative of each amplifier

is connected as shown

From Source

INPUT OUTPUT LEVEL

SUBSONIC LPF PWR

REMOTE

SYNC

SPEAKER

MAS/SV

BOOST

PHASE

INPUT OUTPUT LEVEL

SUBSONIC LPF PWR

REMOTE

SYNC

SPEAKE

MAS/SV

BOOST

PHASE

1 2 3 4 5 6 7 8 9

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